Pub Date : 2024-10-11DOI: 10.1016/j.est.2024.114035
A starch-polyacrylamide (S-PAM) double-network hydrogel characterized by high ionic conductivity, excellent water retention capacity, mechanical flexibility, and strong adhesion was prepared using a simple graft copolymerization technique. Remarkably, the flexible zinc-air battery, assembled with the high-performance S-PAM electrolyte and CoFe-NC bifunctional catalyst, exhibited a high discharge voltage of 1.3 V and sustained operation for over 40 h. Furthermore, the battery maintained a stable voltage output under various bending and impact conditions, demonstrating a great potential for wearable applications.
{"title":"Starch-reinforced adhesive hydrogel electrolyte enables high-performance flexible zinc-air batteries","authors":"","doi":"10.1016/j.est.2024.114035","DOIUrl":"10.1016/j.est.2024.114035","url":null,"abstract":"<div><div>A starch-polyacrylamide (S-PAM) double-network hydrogel characterized by high ionic conductivity, excellent water retention capacity, mechanical flexibility, and strong adhesion was prepared using a simple graft copolymerization technique. Remarkably, the flexible zinc-air battery, assembled with the high-performance S-PAM electrolyte and CoFe-NC bifunctional catalyst, exhibited a high discharge voltage of 1.3 V and sustained operation for over 40 h. Furthermore, the battery maintained a stable voltage output under various bending and impact conditions, demonstrating a great potential for wearable applications.</div></div>","PeriodicalId":15942,"journal":{"name":"Journal of energy storage","volume":null,"pages":null},"PeriodicalIF":8.9,"publicationDate":"2024-10-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142417546","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-10-11DOI: 10.1016/j.est.2024.114047
The development of bifunctional electrocatalysts to overcome the slow kinetics of the oxygen reduction reaction (ORR)/the oxygen evolution reaction (OER) is a significant challenge. Herein, Fe80-ZIF-67@CN, a CoFe alloy nitrogen-doped multilayer porous carbon electrocatalysts is designed and successful prepared, natural eggshell membrane (ESM) as precursor, Graphitic carbon nitride (G-C3N4) as nitrogen source, and a small amount of iron and cobalt salts as non-noble metal sources. Due to the synergistic effect between the CoFe alloy and FeNX, CoNX sites, the Fe80-ZIF-67@CN electrocatalysts display a half-wave potential (E1/2) of 0.86 V (ORR), an overpotential (Ej10) of 339 mV (OER), and a potential difference (∆E) of 0.71 V. In addition, the Tafel slopes for the ORR and OER are 90.36 mV dec−1 and 52.35 mV dec−1, respectively. More importantly, the Zn-air battery assembled with Fe80-ZIF-67@CN exhibits a large power density of 126.47 mW cm−2, the open circuit voltage (OCP) of 1.54 V and excellent stability without significant voltage changes even after 176 h, which are superior to that of 20 % Pt/C + RuO2. This work paves a new design option for oxygen electrocatalysts for zinc-air batteries.
{"title":"CoFe/N doped biomass-derived carbon as multi-layer porous efficient bifunctional composite for zinc-air battery","authors":"","doi":"10.1016/j.est.2024.114047","DOIUrl":"10.1016/j.est.2024.114047","url":null,"abstract":"<div><div>The development of bifunctional electrocatalysts to overcome the slow kinetics of the oxygen reduction reaction (ORR)/the oxygen evolution reaction (OER) is a significant challenge. Herein, Fe<sub>80</sub>-ZIF-67@CN, a CoFe alloy nitrogen-doped multilayer porous carbon electrocatalysts is designed and successful prepared, natural eggshell membrane (ESM) as precursor, Graphitic carbon nitride (G-C<sub>3</sub>N<sub>4</sub>) as nitrogen source, and a small amount of iron and cobalt salts as non-noble metal sources. Due to the synergistic effect between the CoFe alloy and FeN<sub>X</sub>, CoN<sub>X</sub> sites, the Fe<sub>80</sub>-ZIF-67@CN electrocatalysts display a half-wave potential (E<sub>1/2</sub>) of 0.86 V (ORR), an overpotential (E<sub>j10</sub>) of 339 mV (OER), and a potential difference (∆E) of 0.71 V. In addition, the Tafel slopes for the ORR and OER are 90.36 mV dec<sup>−1</sup> and 52.35 mV dec<sup>−1</sup>, respectively. More importantly, the Zn-air battery assembled with Fe<sub>80</sub>-ZIF-67@CN exhibits a large power density of 126.47 mW cm<sup>−2</sup>, the open circuit voltage (OCP) of 1.54 V and excellent stability without significant voltage changes even after 176 h, which are superior to that of 20 % Pt/C + RuO<sub>2</sub>. This work paves a new design option for oxygen electrocatalysts for zinc-air batteries.</div></div>","PeriodicalId":15942,"journal":{"name":"Journal of energy storage","volume":null,"pages":null},"PeriodicalIF":8.9,"publicationDate":"2024-10-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142417233","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-10-11DOI: 10.1016/j.est.2024.114054
The low rate performance and limited energy density prevent hybrid supercapacitors (HSCs) from being used much further. Herein, a straightforward two-step procedure is used to create the rate-enhanced NiC2O4/NiCoB composites, which are composed of NiC2O4 nanorods and NiCoB. At the current density of 1 A g−1, the NiC2O4/NiCoB electrode provides a high specific capacitance of 624C g−1. The introduction of the NiCoB outer layer significantly enhances the electron transport capability and accelerates the ion/electron transfer rate. This design effectively addresses the inherently poor rate performance of NiC2O4 (with only 32.5 % capacity retention at a high current density of 10 A g−1). With the NiCoB outer coating, the capacity retention is remarkably improved to 85.7 % at the current density of 10 A g−1. The incorporation of the coating structure fundamentally resolves the issue of poor high-rate performance in the material. Therefore, based on the NiC2O4/NiCoB as the positive electrode and activated carbon (AC) as the negative electrode, NiC2O4/NiCoB||AC HSC is assembled. With the maximum potential window of 1.6 V, this HSC exhibits an energy density of 47.4 Wh kg−1 and a power density of 881.47 W kg−1. The innovative design of crystalline-amorphous double nickel-based composites offers an advanced and straightforward approach to enhancing the electron/ion transport kinetics in nickel-based materials, enabling the construction of high-performance HSCs.
{"title":"Crystalline-amorphous double nickel-based composites for high-performance asymmetric supercapacitors to enhance rate performance","authors":"","doi":"10.1016/j.est.2024.114054","DOIUrl":"10.1016/j.est.2024.114054","url":null,"abstract":"<div><div>The low rate performance and limited energy density prevent hybrid supercapacitors (HSCs) from being used much further. Herein, a straightforward two-step procedure is used to create the rate-enhanced NiC<sub>2</sub>O<sub>4</sub>/NiCoB composites, which are composed of NiC<sub>2</sub>O<sub>4</sub> nanorods and NiCoB. At the current density of 1 A g<sup>−1</sup>, the NiC<sub>2</sub>O<sub>4</sub>/NiCoB electrode provides a high specific capacitance of 624C g<sup>−1</sup>. The introduction of the NiCoB outer layer significantly enhances the electron transport capability and accelerates the ion/electron transfer rate. This design effectively addresses the inherently poor rate performance of NiC<sub>2</sub>O<sub>4</sub> (with only 32.5 % capacity retention at a high current density of 10 A g<sup>−1</sup>). With the NiCoB outer coating, the capacity retention is remarkably improved to 85.7 % at the current density of 10 A g<sup>−1</sup>. The incorporation of the coating structure fundamentally resolves the issue of poor high-rate performance in the material. Therefore, based on the NiC<sub>2</sub>O<sub>4</sub>/NiCoB as the positive electrode and activated carbon (AC) as the negative electrode, NiC<sub>2</sub>O<sub>4</sub>/NiCoB||AC HSC is assembled. With the maximum potential window of 1.6 <em>V</em>, this HSC exhibits an energy density of 47.4 Wh kg<sup>−1</sup> and a power density of 881.47 W kg<sup>−1</sup>. The innovative design of crystalline-amorphous double nickel-based composites offers an advanced and straightforward approach to enhancing the electron/ion transport kinetics in nickel-based materials, enabling the construction of high-performance HSCs.</div></div>","PeriodicalId":15942,"journal":{"name":"Journal of energy storage","volume":null,"pages":null},"PeriodicalIF":8.9,"publicationDate":"2024-10-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142417024","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-10-11DOI: 10.1016/j.est.2024.113913
<div><div>DC microgrid (DC<span><math><mi>μ</mi></math></span>G) is becoming popular for niche applications due to multiple advantages over AC microgrids (<span><math><mi>μ</mi></math></span>G). However, operation of a DC<span><math><mi>μ</mi></math></span>G is challenging due to uncertainties of renewable energy source (RES) generation and load demands, limited availability of controllable generation, and unintended islanding events. Sectoral coupling between electricity and hydrogen (<span><math><mrow><mi>H</mi><mn>2</mn></mrow></math></span>), hybrid energy storage system (HESS), and demand response (DR) implementation address the challenges and enhance the techno-economic benefits of DC<span><math><mi>μ</mi></math></span>G operation. Further, incorporating islanding constraints in the scheduling strategy improves the security of system operation. The objective of this paper is to develop an energy management scheme (EMS) for an electricity-<span><math><mrow><mi>H</mi><mn>2</mn></mrow></math></span> grid-connected DC<span><math><mi>μ</mi></math></span>G with a HESS incorporating islanding constraints and DR implementation in an uncertain environment with correlated and uncorrelated input uncertainties to maximize the profit of the DC<span><math><mi>μ</mi></math></span>G operator (DC<span><math><mi>μ</mi></math></span>GO), minimize the electricity usage cost of consumers, and ensure secure operation after unintended islanding using bi-level optimization.DC<span><math><mi>μ</mi></math></span>G network level, equipment level, and consumer’s apparatus level operating security constraints are considered in the EMS. Uncertainties of input random variables (RV) and their correlation are modelled using Copula theory and incorporated in the EMS. The DC<span><math><mi>μ</mi></math></span>G consists of a gas turbine (GT), power to hydrogen (P2H), hydrogen to power (H2P), HESS (comprising battery energy storage system (BESS) and hydrogen storage system (HSS)), wind power generation (WPG), solar power generation (SPG), and consumers. The consumers have non-flexible and flexible loads (thermostatically controlled load (TCL) and plug-in hybrid electric vehicles (PHEV)). The proposed EMS is modelled using a bi-level leader–follower Stackelberg game (SG) architecture, in which the DC<span><math><mi>μ</mi></math></span>GO is the leader and the consumers are followers. The DC<span><math><mi>μ</mi></math></span>GO optimally schedules flexible resources within its control and sets the retail power price (RPP) to maximize the operating profit. Consumers participate in the DR program by adjusting flexible demands according to the RPP to minimize the cost of electricity use. The dynamic RPP acts as the bridge between the upper and lower-level problems. The bi-level EMS is reformulated as a single-level mixed-integer linear programming (MILP) problem by successively using Karush–Kuhn–Tucker (KKT) conditions, the big-M method, and the strong duality theory. The MILP pr
{"title":"DC microgrid operation with hybrid energy storage considering islanding constraints and demand response coordination: A bi-level Stackelberg game approach","authors":"","doi":"10.1016/j.est.2024.113913","DOIUrl":"10.1016/j.est.2024.113913","url":null,"abstract":"<div><div>DC microgrid (DC<span><math><mi>μ</mi></math></span>G) is becoming popular for niche applications due to multiple advantages over AC microgrids (<span><math><mi>μ</mi></math></span>G). However, operation of a DC<span><math><mi>μ</mi></math></span>G is challenging due to uncertainties of renewable energy source (RES) generation and load demands, limited availability of controllable generation, and unintended islanding events. Sectoral coupling between electricity and hydrogen (<span><math><mrow><mi>H</mi><mn>2</mn></mrow></math></span>), hybrid energy storage system (HESS), and demand response (DR) implementation address the challenges and enhance the techno-economic benefits of DC<span><math><mi>μ</mi></math></span>G operation. Further, incorporating islanding constraints in the scheduling strategy improves the security of system operation. The objective of this paper is to develop an energy management scheme (EMS) for an electricity-<span><math><mrow><mi>H</mi><mn>2</mn></mrow></math></span> grid-connected DC<span><math><mi>μ</mi></math></span>G with a HESS incorporating islanding constraints and DR implementation in an uncertain environment with correlated and uncorrelated input uncertainties to maximize the profit of the DC<span><math><mi>μ</mi></math></span>G operator (DC<span><math><mi>μ</mi></math></span>GO), minimize the electricity usage cost of consumers, and ensure secure operation after unintended islanding using bi-level optimization.DC<span><math><mi>μ</mi></math></span>G network level, equipment level, and consumer’s apparatus level operating security constraints are considered in the EMS. Uncertainties of input random variables (RV) and their correlation are modelled using Copula theory and incorporated in the EMS. The DC<span><math><mi>μ</mi></math></span>G consists of a gas turbine (GT), power to hydrogen (P2H), hydrogen to power (H2P), HESS (comprising battery energy storage system (BESS) and hydrogen storage system (HSS)), wind power generation (WPG), solar power generation (SPG), and consumers. The consumers have non-flexible and flexible loads (thermostatically controlled load (TCL) and plug-in hybrid electric vehicles (PHEV)). The proposed EMS is modelled using a bi-level leader–follower Stackelberg game (SG) architecture, in which the DC<span><math><mi>μ</mi></math></span>GO is the leader and the consumers are followers. The DC<span><math><mi>μ</mi></math></span>GO optimally schedules flexible resources within its control and sets the retail power price (RPP) to maximize the operating profit. Consumers participate in the DR program by adjusting flexible demands according to the RPP to minimize the cost of electricity use. The dynamic RPP acts as the bridge between the upper and lower-level problems. The bi-level EMS is reformulated as a single-level mixed-integer linear programming (MILP) problem by successively using Karush–Kuhn–Tucker (KKT) conditions, the big-M method, and the strong duality theory. The MILP pr","PeriodicalId":15942,"journal":{"name":"Journal of energy storage","volume":null,"pages":null},"PeriodicalIF":8.9,"publicationDate":"2024-10-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142417227","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-10-11DOI: 10.1016/j.est.2024.114077
The reliability and safety of lithium-ion batteries due to the complex interaction of degradation mechanisms lead to battery aging and faults with substantial hazards. This will increase the difficulty in precisely estimating the state of health (SOH) to ensure efficient management. To overcome SOH complexity, this work investigates the application of genetic programming (GP) to identify battery degradation and forecast SOH. GP is powerful but faces the challenges of creating accurate and robust models that can handle the nonlinear and dynamic nature by balancing model complexity. Additionally, GP's adaptability to battery usage and sensitivity to parameter selection must be carefully considered. Despite these challenges, GP can create sophisticated, data-driven models, making it a promising SOH estimation tool. Henceforth, a model selection criterion genetic programming (MSC-GP) approach has been proposed to address these issues. The investigation evaluates the effect of objective functions (OFs) on algorithm performance through rigorous key statistical metrics. Furthermore, it demonstrates the significant influence that the choice of OFs has on the model's performance, emphasizing the algorithm's potential for accurate battery health assessment. The results unequivocally show that the MSC-GP algorithm is more effective at recognizing the aging state of lithium-ion batteries compared to artificial neural network (ANN) and Gaussian progress regression (GPR). Although the initial findings are encouraging, additional research is required to tackle the multifaceted deprivation associated with accurately predicting battery life.
{"title":"Enhancing battery health estimation using model selection criteria-based genetic programming","authors":"","doi":"10.1016/j.est.2024.114077","DOIUrl":"10.1016/j.est.2024.114077","url":null,"abstract":"<div><div>The reliability and safety of lithium-ion batteries due to the complex interaction of degradation mechanisms lead to battery aging and faults with substantial hazards. This will increase the difficulty in precisely estimating the state of health (SOH) to ensure efficient management. To overcome SOH complexity, this work investigates the application of genetic programming (GP) to identify battery degradation and forecast SOH. GP is powerful but faces the challenges of creating accurate and robust models that can handle the nonlinear and dynamic nature by balancing model complexity. Additionally, GP's adaptability to battery usage and sensitivity to parameter selection must be carefully considered. Despite these challenges, GP can create sophisticated, data-driven models, making it a promising SOH estimation tool. Henceforth, a model selection criterion genetic programming (MSC-GP) approach has been proposed to address these issues. The investigation evaluates the effect of objective functions (OFs) on algorithm performance through rigorous key statistical metrics. Furthermore, it demonstrates the significant influence that the choice of OFs has on the model's performance, emphasizing the algorithm's potential for accurate battery health assessment. The results unequivocally show that the MSC-GP algorithm is more effective at recognizing the aging state of lithium-ion batteries compared to artificial neural network (ANN) and Gaussian progress regression (GPR). Although the initial findings are encouraging, additional research is required to tackle the multifaceted deprivation associated with accurately predicting battery life.</div></div>","PeriodicalId":15942,"journal":{"name":"Journal of energy storage","volume":null,"pages":null},"PeriodicalIF":8.9,"publicationDate":"2024-10-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142417174","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-10-11DOI: 10.1016/j.est.2024.114040
Due to the widespread usage of energy consumption, there is an increasing need for energy at a global scale. Supercapacitors have been a better choice lately because of their high-power density, rapid charging and discharging, and prolonged cycle life. Several electrode materials have been studied thus far to enhance the performance of the supercapacitor. In recent times, transition metal dichalcogenides (TMDCs) have gained popularity as active electrode material for supercapacitors owing to their interesting structure, better stability, larger surface area, more active sites, and high electrical conductivity. Among various TMDCs, MoS2 has gained interest as an electrode material due to its amazing characteristics such as being rich in active sites, honeycomb structure, increased ionic and electronic conductivity, and increased surface area. The current article mainly focuses on various synthesis methods for Molybdenum disulfide (MoS2). Furthermore, pure MoS2 and its composite with carbon-based material, conducting polymer-based materials, metal oxides, carbides, and nitrides have been utilized to improve the performance of supercapacitors discussed. In the last section, future perspectives and challenges are discussed.
{"title":"Emerging advances of 2D molybdenum disulfide (MoS2) and their composites towards high-performance supercapacitors: A comprehensive review","authors":"","doi":"10.1016/j.est.2024.114040","DOIUrl":"10.1016/j.est.2024.114040","url":null,"abstract":"<div><div>Due to the widespread usage of energy consumption, there is an increasing need for energy at a global scale. Supercapacitors have been a better choice lately because of their high-power density, rapid charging and discharging, and prolonged cycle life. Several electrode materials have been studied thus far to enhance the performance of the supercapacitor. In recent times, transition metal dichalcogenides (TMDCs) have gained popularity as active electrode material for supercapacitors owing to their interesting structure, better stability, larger surface area, more active sites, and high electrical conductivity. Among various TMDCs, MoS<sub>2</sub> has gained interest as an electrode material due to its amazing characteristics such as being rich in active sites, honeycomb structure, increased ionic and electronic conductivity, and increased surface area. The current article mainly focuses on various synthesis methods for Molybdenum disulfide (MoS<sub>2</sub>). Furthermore, pure MoS<sub>2</sub> and its composite with carbon-based material, conducting polymer-based materials, metal oxides, carbides, and nitrides have been utilized to improve the performance of supercapacitors discussed. In the last section, future perspectives and challenges are discussed.</div></div>","PeriodicalId":15942,"journal":{"name":"Journal of energy storage","volume":null,"pages":null},"PeriodicalIF":8.9,"publicationDate":"2024-10-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142417544","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-10-11DOI: 10.1016/j.est.2024.114115
Charge/discharge performance of all-solid-state lithium ion batteries (LIBs) is not yet high, compared to those for conventional liquid-type LIBs, which is mainly due to the imperfect joining of solid electrolyte and electrodes. To promote the interfacial lithium ion transfer among the solids, in this study, the nearly saturated and non-flammable electrolyte solutions were incorporated into an interspace among the solids to obtain quasi-solid-state Si|LiNi0.8Co0.1Mn0.1O2 (NCM811) batteries. The Si negative- and NCM811 positive-electrodes were separated with a solid electrolyte sheet, and hence two different electrolyte solutions were used for each electrode. The nearly saturated electrolyte solutions suitable for each electrode and the solid electrolyte were designed, and 30 mAh-class quasi-solid-state pouch cells were fabricated using them. The improved safety and charge/discharge performance demonstrated the feasibility of quasi-solid-state batteries as a near-future technology.
与传统液态锂离子电池相比，全固态锂离子电池的充放电性能还不高，这主要是由于固体电解质与电极的结合不完美。为了促进锂离子在固体之间的界面转移，本研究将接近饱和且不易燃的电解质溶液加入到固体之间的间隙中，从而获得了准固态 Si|LiNi0.8Co0.1Mn0.1O2 (NCM811) 电池。硅负极和 NCM811 正极用固体电解质薄片隔开，因此每个电极使用两种不同的电解质溶液。设计出了适合每个电极和固体电解质的近饱和电解质溶液，并利用它们制造出了 30 mAh 级准固态袋式电池。安全性和充放电性能的提高证明了准固态电池作为一种近未来技术的可行性。
{"title":"Highly safe quasi-solid-state lithium ion batteries with two kinds of nearly saturated and non-flammable electrolyte solutions","authors":"","doi":"10.1016/j.est.2024.114115","DOIUrl":"10.1016/j.est.2024.114115","url":null,"abstract":"<div><div>Charge/discharge performance of all-solid-state lithium ion batteries (LIBs) is not yet high, compared to those for conventional liquid-type LIBs, which is mainly due to the imperfect joining of solid electrolyte and electrodes. To promote the interfacial lithium ion transfer among the solids, in this study, the nearly saturated and non-flammable electrolyte solutions were incorporated into an interspace among the solids to obtain quasi-solid-state Si|LiNi<sub>0.8</sub>Co<sub>0.1</sub>Mn<sub>0.1</sub>O<sub>2</sub> (NCM811) batteries. The Si negative- and NCM811 positive-electrodes were separated with a solid electrolyte sheet, and hence two different electrolyte solutions were used for each electrode. The nearly saturated electrolyte solutions suitable for each electrode and the solid electrolyte were designed, and 30 mAh-class quasi-solid-state pouch cells were fabricated using them. The improved safety and charge/discharge performance demonstrated the feasibility of quasi-solid-state batteries as a near-future technology.</div></div>","PeriodicalId":15942,"journal":{"name":"Journal of energy storage","volume":null,"pages":null},"PeriodicalIF":8.9,"publicationDate":"2024-10-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142417078","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-10-11DOI: 10.1016/j.est.2024.114028
Lithium-ion batteries' state of health (SOH) is a prominent issue for consumers. However, the complex work condition renders conventional SOH estimation methods ineffective in photovoltaic-storage power stations (PVPS). This paper proposed two health indicators calculation methods and a data augmentation method based on the application law of batterie in PVPS. Firstly, the voltage-cycle frequency and voltage distribution are calculated to identify the voltage plateau period from the continuous operation data. The voltage of similar energy and stair-step voltage were separated from the plateau period. Then the coulombs were calculated as health indicators based on two voltage features. Finally, the pseudo-health indicators were predicted based on the test set and augmentation model. The pseudo-health indicators were added in the test set to restore the past state of the continuity algorithms. Experiments show that the correlation coefficients of two health indicators are greater than 0.87. It confirmed their robust aging characterization capability under the PVPS condition. The accuracy of the six RNNs has been significantly improved under different numbers of pseudo-health indicators. Especially, the optimal result shows that the mean absolute percentage error is 0.204 %, while the root mean square error is 0.265 %. Through multiple validation and comparison, the precision and versatility of this study are confirmed, which provides support for large-capacity lithium‑iron-phosphate (LFP) battery applications in PVPS.
{"title":"A high-precision state of health estimation method based on data augmentation for large-capacity lithium-ion batteries","authors":"","doi":"10.1016/j.est.2024.114028","DOIUrl":"10.1016/j.est.2024.114028","url":null,"abstract":"<div><div>Lithium-ion batteries' state of health (SOH) is a prominent issue for consumers. However, the complex work condition renders conventional SOH estimation methods ineffective in photovoltaic-storage power stations (PVPS). This paper proposed two health indicators calculation methods and a data augmentation method based on the application law of batterie in PVPS. Firstly, the voltage-cycle frequency and voltage distribution are calculated to identify the voltage plateau period from the continuous operation data. The voltage of similar energy and stair-step voltage were separated from the plateau period. Then the coulombs were calculated as health indicators based on two voltage features. Finally, the pseudo-health indicators were predicted based on the test set and augmentation model. The pseudo-health indicators were added in the test set to restore the past state of the continuity algorithms. Experiments show that the correlation coefficients of two health indicators are greater than 0.87. It confirmed their robust aging characterization capability under the PVPS condition. The accuracy of the six RNNs has been significantly improved under different numbers of pseudo-health indicators. Especially, the optimal result shows that the mean absolute percentage error is 0.204 %, while the root mean square error is 0.265 %. Through multiple validation and comparison, the precision and versatility of this study are confirmed, which provides support for large-capacity lithium‑iron-phosphate (LFP) battery applications in PVPS.</div></div>","PeriodicalId":15942,"journal":{"name":"Journal of energy storage","volume":null,"pages":null},"PeriodicalIF":8.9,"publicationDate":"2024-10-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142417086","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-10-11DOI: 10.1016/j.est.2024.114079
The hybrid-type of supercapacitors based on transition metal sulfides-carbon composite electrodes are found to be a prominent and emerging technological advancement with beneficial characteristics such as a larger surface area, high durability, and a unique charge storage mechanism. In this work, phase pure copper tin sulfide (Cu2SnS3/CTS) nanoparticles (NPs) and the nanocomposite of CTS NPs decorated graphitic carbon nitride (g-C3N4) CTS-gCN were prepared by an inexpensive solvothermal approach. The CTS-gCN nanocomposite-based supercapacitors show a high specific capacitance of 477 F/g at 1 A g−1 current density, which is much higher than the pristine CTS NPs based supercapacitors (362 F/g) in three electrode configurations. The asymmetric hybrid supercapacitors were prepared with CTS-gCN electrodes and reduced graphene oxide (rGO) as a negative electrode with potassium hydroxide (KOH) as an electrolyte. The electrochemical characteristics of asymmetric CTS-gCN//rGO supercapacitors exhibit battery-like behavior with a specific capacitance of 108 F/g at the scan rate of 1 A g−1 with a high energy density of 42 W h kg−1 and a power density of 835.4 W kg−1. The CTS-gCN//rGO supercapacitors show excellent capacitance retention over 94 % even after 2000 cycles. The obtained electrochemical results of the supercapacitors with high energy density, power density, wider potential window, and cyclic stability suggest the CTS-gCN//rGO hybrid supercapacitors as a promising candidate for emerging electrochemical energy storage technologies.
基于过渡金属硫化物-碳复合电极的混合型超级电容器具有比表面积大、耐用性高、电荷存储机制独特等优点，是一项突出的新兴技术进步。本研究采用廉价的溶热法制备了相纯硫化铜锡（Cu2SnS3/CTS）纳米颗粒（NPs）和 CTS NPs 装饰氮化石墨碳（g-C3N4）的纳米复合材料 CTS-gCN。基于 CTS-gCN 纳米复合材料的超级电容器在 1 A g-1 电流密度下显示出 477 F/g 的高比电容，远高于三种电极配置下基于原始 CTS NPs 的超级电容器（362 F/g）。不对称混合超级电容器以 CTS-gCN 为电极，还原氧化石墨烯（rGO）为负极，氢氧化钾（KOH）为电解质。不对称 CTS-gCN//rGO 超级电容器的电化学特性与电池类似，在扫描速率为 1 A g-1 时，比电容为 108 F/g，能量密度高达 42 W h kg-1，功率密度为 835.4 W kg-1。CTS-gCN//rGO 超级电容器在 2000 次循环后仍能保持 94% 以上的出色电容。超级电容器具有高能量密度、功率密度、更宽的电位窗口和循环稳定性，这些电化学结果表明，CTS-gCN//rGO 混合超级电容器有望成为新兴电化学储能技术的候选产品。
{"title":"Investigation of Cu2SnS3 nanoparticles decorated g-C3N4 nanocomposites for high performance battery-type hybrid supercapacitors","authors":"","doi":"10.1016/j.est.2024.114079","DOIUrl":"10.1016/j.est.2024.114079","url":null,"abstract":"<div><div>The hybrid-type of supercapacitors based on transition metal sulfides-carbon composite electrodes are found to be a prominent and emerging technological advancement with beneficial characteristics such as a larger surface area, high durability, and a unique charge storage mechanism. In this work, phase pure copper tin sulfide (Cu<sub>2</sub>SnS<sub>3</sub>/CTS) nanoparticles (NPs) and the nanocomposite of CTS NPs decorated graphitic carbon nitride (g-C<sub>3</sub>N<sub>4</sub>) CTS-gCN were prepared by an inexpensive solvothermal approach. The CTS-gCN nanocomposite-based supercapacitors show a high specific capacitance of 477 F/g at 1 A g<sup>−1</sup> current density, which is much higher than the pristine CTS NPs based supercapacitors (362 F/g) in three electrode configurations. The asymmetric hybrid supercapacitors were prepared with CTS-gCN electrodes and reduced graphene oxide (rGO) as a negative electrode with potassium hydroxide (KOH) as an electrolyte. The electrochemical characteristics of asymmetric CTS-gCN//rGO supercapacitors exhibit battery-like behavior with a specific capacitance of 108 F/g at the scan rate of 1 A g<sup>−1</sup> with a high energy density of 42 W h kg<sup>−1</sup> and a power density of 835.4 W kg<sup>−1</sup>. The CTS-gCN//rGO supercapacitors show excellent capacitance retention over 94 % even after 2000 cycles. The obtained electrochemical results of the supercapacitors with high energy density, power density, wider potential window, and cyclic stability suggest the CTS-gCN//rGO hybrid supercapacitors as a promising candidate for emerging electrochemical energy storage technologies.</div></div>","PeriodicalId":15942,"journal":{"name":"Journal of energy storage","volume":null,"pages":null},"PeriodicalIF":8.9,"publicationDate":"2024-10-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142417089","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-10-11DOI: 10.1016/j.est.2024.113979
Thermal energy storage systems open up considerable potentials for flexibility due to their time-decoupled operation. This allows a balance between fluctuating energy generation and consumption, thus improvements in efficiency and stability of energy infrastructures. Sensible thermal storage systems are particularly suitable for large-scale applications, whereby solid - regenerators - or liquid salt-based solutions are used depending on the application. In the case of regenerators with packed beds or channel-shaped inventory options, thermal energy is stored by a cyclically moving thermocline, resulting in time-variable outlet temperatures during charging and discharging. These transient characteristics significantly increase the systemic integration requirements: cyclical propagation of thermal inertia at downstream components, restrictions with regard to an optimum operating point, complex simulations and increased control effort. Based on these challenges, a new solid media storage system is presented which achieves - analogous to liquid salt systems - constant outlet temperatures during charging and discharging. The basic idea is to add bypass paths, which guide a part of the incoming mass flows around the storage system and reunite them with the main flows at the respective outlets. This allows constant outlet temperatures by temporal adjusting the mass flow distribution. Investigations into such bypass concepts ideally require analytical models of system-relevant storage characteristics as a function of central dimensioning values. Based on a theoretical derivation, a dimensionless model was developed for this purpose, which was converted into a correlation for solid media storage systems with and without a bypass option. For the first time, it is now possible to perform direct, correlation-based design calculations of system-relevant storage characteristics in the cyclic equilibrium. Comparative calculations with numerical simulation results confirm the good agreement and also show that the mixing-related exergy losses for storage systems with a bypass option are accompanied by a proportionally lower dimensioning requirement. The correlation-based design tool presented here opens up a new path to investigate solid media storages with and without bypass option, which significantly facilitates storage-supported simulations for future techno-economic evaluations of the technology.
{"title":"Solid media thermal energy storages with bypass and conventional operation: Development of model-based correlations for designing and evaluation","authors":"","doi":"10.1016/j.est.2024.113979","DOIUrl":"10.1016/j.est.2024.113979","url":null,"abstract":"<div><div>Thermal energy storage systems open up considerable potentials for flexibility due to their time-decoupled operation. This allows a balance between fluctuating energy generation and consumption, thus improvements in efficiency and stability of energy infrastructures. Sensible thermal storage systems are particularly suitable for large-scale applications, whereby solid - regenerators - or liquid salt-based solutions are used depending on the application. In the case of regenerators with packed beds or channel-shaped inventory options, thermal energy is stored by a cyclically moving thermocline, resulting in time-variable outlet temperatures during charging and discharging. These transient characteristics significantly increase the systemic integration requirements: cyclical propagation of thermal inertia at downstream components, restrictions with regard to an optimum operating point, complex simulations and increased control effort. Based on these challenges, a new solid media storage system is presented which achieves - analogous to liquid salt systems - constant outlet temperatures during charging and discharging. The basic idea is to add bypass paths, which guide a part of the incoming mass flows around the storage system and reunite them with the main flows at the respective outlets. This allows constant outlet temperatures by temporal adjusting the mass flow distribution. Investigations into such bypass concepts ideally require analytical models of system-relevant storage characteristics as a function of central dimensioning values. Based on a theoretical derivation, a dimensionless model was developed for this purpose, which was converted into a correlation for solid media storage systems with and without a bypass option. For the first time, it is now possible to perform direct, correlation-based design calculations of system-relevant storage characteristics in the cyclic equilibrium. Comparative calculations with numerical simulation results confirm the good agreement and also show that the mixing-related exergy losses for storage systems with a bypass option are accompanied by a proportionally lower dimensioning requirement. The correlation-based design tool presented here opens up a new path to investigate solid media storages with and without bypass option, which significantly facilitates storage-supported simulations for future techno-economic evaluations of the technology.</div></div>","PeriodicalId":15942,"journal":{"name":"Journal of energy storage","volume":null,"pages":null},"PeriodicalIF":8.9,"publicationDate":"2024-10-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142417176","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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