Pub Date : 2023-11-01DOI: 10.1016/j.est.2023.109297
Jiangnan Hong, Yucheng Chen, Qinqin Chai, Qiongbin Lin, Wu Wang
Accurate estimation of the state of health (SOH) of lithium-ion batteries is an important guarantee to ensure safe and reliable operation of lithium-ion battery systems. However, the complex aging mechanism inside the battery makes it difficult to measure the battery SOH directly. In this paper, a SOH estimation method based on a novel dual-stage attention-based recurrent neural network (DARNN) and health feature (HF) extraction from time varying charging process is proposed. Firstly, the constant current charging time, the maximum temperature time, the isochronous voltage difference, and the isochronous current were extracted as lithium-ion battery HFs, and their correlations with SOH are verified by spearman correlation coefficient. Secondly, the DARNN is proposed to capture the time-dependent and temporal features of the input sequence and to accurately predict SOH. Finally, the proposed estimation method is validated on the NASA battery dataset. The results show that the method can accurately estimate SOH for lithium-ion batteries. The mean square error and the mean absolute percentage error of the method are <0.5 %.
{"title":"State-of-health estimation of lithium-ion batteries using a novel dual-stage attention mechanism based recurrent neural network","authors":"Jiangnan Hong, Yucheng Chen, Qinqin Chai, Qiongbin Lin, Wu Wang","doi":"10.1016/j.est.2023.109297","DOIUrl":"https://doi.org/10.1016/j.est.2023.109297","url":null,"abstract":"Accurate estimation of the state of health (SOH) of lithium-ion batteries is an important guarantee to ensure safe and reliable operation of lithium-ion battery systems. However, the complex aging mechanism inside the battery makes it difficult to measure the battery SOH directly. In this paper, a SOH estimation method based on a novel dual-stage attention-based recurrent neural network (DARNN) and health feature (HF) extraction from time varying charging process is proposed. Firstly, the constant current charging time, the maximum temperature time, the isochronous voltage difference, and the isochronous current were extracted as lithium-ion battery HFs, and their correlations with SOH are verified by spearman correlation coefficient. Secondly, the DARNN is proposed to capture the time-dependent and temporal features of the input sequence and to accurately predict SOH. Finally, the proposed estimation method is validated on the NASA battery dataset. The results show that the method can accurately estimate SOH for lithium-ion batteries. The mean square error and the mean absolute percentage error of the method are <0.5 %.","PeriodicalId":94331,"journal":{"name":"Journal of energy storage","volume":"17 6","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135111606","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-11-01DOI: 10.1016/j.est.2023.109323
Divya Meena, Rinku Kumar, Saurabh Gupta, Obeidullah Khan, Deepak Gupta, Milan Singh
Supercapacitors are promising candidates for energy storage devices with longer cycle life and higher power density. The development of next-generation supercapacitors relies on a profound understanding of the underlying mechanisms that boost their performance. This comprehensive review critically examines the factors influencing the next-generation supercapacitor mechanisms. It covers the fundamental principles of supercapacitors, including their unique charge storage mechanisms, such as electrical double layer and pseudo-capacitance. It investigates various materials and techniques viz. electrode morphology, the utilisation of advanced electrode materials, and surface modifications for enhancing specific capacitance. Furthermore, it delves into the critical role of electrolytes in supercapacitors' performance. It also assesses the influence of different electrolytes on capacitance, voltage window, and cycling stability. The effect of electroconductivity on the enhanced performance of supercapacitors is also investigated. Additionally, the review covers the in-depth significance of externally applied magnetic fields on supercapacitor systems. Research on factors enhancing the capacitance is crucial for producing next-generation supercapacitors with greater efficiency. The vitality of this research lies in improving energy storage devices, transport electrification, stabilizing electrical grids, powering portable electronic devices, and reducing intermittency issues. Moreover, the enhanced capacitance of supercapacitors can reduce reliance on fossil fuels, contributing to a more sustainable energy storage solution.
{"title":"Energy storage in the 21st century: A comprehensive review on factors enhancing the next-generation supercapacitor mechanisms","authors":"Divya Meena, Rinku Kumar, Saurabh Gupta, Obeidullah Khan, Deepak Gupta, Milan Singh","doi":"10.1016/j.est.2023.109323","DOIUrl":"https://doi.org/10.1016/j.est.2023.109323","url":null,"abstract":"Supercapacitors are promising candidates for energy storage devices with longer cycle life and higher power density. The development of next-generation supercapacitors relies on a profound understanding of the underlying mechanisms that boost their performance. This comprehensive review critically examines the factors influencing the next-generation supercapacitor mechanisms. It covers the fundamental principles of supercapacitors, including their unique charge storage mechanisms, such as electrical double layer and pseudo-capacitance. It investigates various materials and techniques viz. electrode morphology, the utilisation of advanced electrode materials, and surface modifications for enhancing specific capacitance. Furthermore, it delves into the critical role of electrolytes in supercapacitors' performance. It also assesses the influence of different electrolytes on capacitance, voltage window, and cycling stability. The effect of electroconductivity on the enhanced performance of supercapacitors is also investigated. Additionally, the review covers the in-depth significance of externally applied magnetic fields on supercapacitor systems. Research on factors enhancing the capacitance is crucial for producing next-generation supercapacitors with greater efficiency. The vitality of this research lies in improving energy storage devices, transport electrification, stabilizing electrical grids, powering portable electronic devices, and reducing intermittency issues. Moreover, the enhanced capacitance of supercapacitors can reduce reliance on fossil fuels, contributing to a more sustainable energy storage solution.","PeriodicalId":94331,"journal":{"name":"Journal of energy storage","volume":"52 2","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135111818","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-10-01DOI: 10.1016/j.est.2023.108035
Hua Chai, Xuan Zhao, Qiang Yu, Shu Wang, Qi Han, Zichen Zheng
Road grade plays an important role in deciding power repartition and improving energy management performances. In this paper, instead of predictive energy management strategies where terrain information is obtained from GIS maps, an adaptive equivalent consumption minimization strategy (A-ECMS) considering current road grade information is proposed, aiming to design an instantaneous feedback supervisory controller based on the estimation of current road grade without using external devices. To achieve real-time control for a plug-in hybrid electric truck (PHET), the bounds of the optimal equivalent factor (EF) are analyzed considering comprehensive performances, then the sensitivity of EF is evaluated towards road grade. According to the effect of different road grade scenarios on control performances, the real-time EF adaptation is divided into two conditions, i.e. SOC-based adaptation and Estimation-based adaption. The proposed A-ECMS can achieve good performances on both fuel economy improvement and emission reduction, which approximates the results obtained from the DP algorithm, and the high computing load can be avoided for real-time implementation.
{"title":"Adaptive equivalent consumption minimization strategy based on road grade estimation for a plug-in hybrid electric truck","authors":"Hua Chai, Xuan Zhao, Qiang Yu, Shu Wang, Qi Han, Zichen Zheng","doi":"10.1016/j.est.2023.108035","DOIUrl":"https://doi.org/10.1016/j.est.2023.108035","url":null,"abstract":"Road grade plays an important role in deciding power repartition and improving energy management performances. In this paper, instead of predictive energy management strategies where terrain information is obtained from GIS maps, an adaptive equivalent consumption minimization strategy (A-ECMS) considering current road grade information is proposed, aiming to design an instantaneous feedback supervisory controller based on the estimation of current road grade without using external devices. To achieve real-time control for a plug-in hybrid electric truck (PHET), the bounds of the optimal equivalent factor (EF) are analyzed considering comprehensive performances, then the sensitivity of EF is evaluated towards road grade. According to the effect of different road grade scenarios on control performances, the real-time EF adaptation is divided into two conditions, i.e. SOC-based adaptation and Estimation-based adaption. The proposed A-ECMS can achieve good performances on both fuel economy improvement and emission reduction, which approximates the results obtained from the DP algorithm, and the high computing load can be avoided for real-time implementation.","PeriodicalId":94331,"journal":{"name":"Journal of energy storage","volume":"46 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136216780","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Researchers worldwide use graphene extensively in its powder form for various applications such as supercapacitors, solar cells, drug delivery, and polymer composites, owing to its considerably valuable properties. However, relatively few studies have been made on the 3D-hydrogel form of graphene for these applications. Here we report a simple and fresh method to prepare 3D graphene hydrogel (3DGH) and its bimetal composite with tungsten trioxide (WO3) and manganese dioxide (MnO2). The structure of 3DGH and its composite is confirmed by advanced characterization techniques viz. Raman Spectroscopy, X-Ray diffraction (XRD), Fourier-transformed infrared spectroscopy (FT-IR), scanning electron microscope (SEM), and tunneling electron microscope (TEM). Further, two symmetric devices using 3DGH, 3DGH-metal composite (3DGHMC), and one asymmetric 3DGHMC-3DGH device are comparatively studied using two electrode systems. The effects of scan rates, current densities, voltage window, and frequency were examined for each device by cyclic voltammetry (CV), galvanic charge-discharge (GCD), and Electron impedance spectroscopy (EIS). The asymmetric device showed a high specific capacitance of 657 F g−1 with an excellent energy density of 48.25 W h kg−1 and a high-power density of 596.06 W kg−1 at the current density of 1 A g−1. Also, the asymmetric device retains 100 % of its initial capacitance after 1000 charging-discharging cycles, also extends its stability after 1000 cycling test. Moreover, the quantitative analysis of the device is also made by Dunn's method to evaluate the percentage contribution from surface and diffusion capacitance.
由于石墨烯具有相当有价值的特性，世界各地的研究人员广泛地将其粉末形式用于各种应用，如超级电容器、太阳能电池、药物输送和聚合物复合材料。然而，针对这些应用的3d水凝胶形式的石墨烯的研究相对较少。本文报道了一种制备三维石墨烯水凝胶(3DGH)及其三氧化钨(WO3)和二氧化锰(MnO2)双金属复合材料的新方法。通过拉曼光谱、x射线衍射(XRD)、傅里叶变换红外光谱(FT-IR)、扫描电子显微镜(SEM)和隧道电子显微镜(TEM)等先进表征技术证实了三维生长激素及其复合材料的结构。在此基础上，对比研究了两种电极体系下采用3DGH的对称器件3DGH-金属复合材料(3DGHMC)和一种不对称器件3DGHMC-3DGH。通过循环伏安法(CV)、充放电法(GCD)和电子阻抗谱法(EIS)检测了扫描速率、电流密度、电压窗和频率对每个器件的影响。该非对称器件具有657 F g−1的高比电容、48.25 W h kg−1的能量密度和596.06 W kg−1的高功率密度，电流密度为1 a g−1。同时，非对称器件在1000次充放电循环后仍能保持100%的初始电容，在1000次循环测试后也能延长其稳定性。此外，还采用Dunn方法对器件进行了定量分析，以评估表面电容和扩散电容的百分比贡献。
{"title":"3D-graphene hydrogel and tungsten trioxide-MnO2 composite for ultra-high-capacity asymmetric supercapacitors: A comparative study","authors":"Gaurav Tatrari, Chetna Tewari, Mayank Pathak, Diksha Bhatt, Manoj Karakoti, Sandeep Pandey, Deewan Singh Uniyal, Faiz Ullah Shah, Nanda Gopal Sahoo","doi":"10.1016/j.est.2023.107830","DOIUrl":"https://doi.org/10.1016/j.est.2023.107830","url":null,"abstract":"Researchers worldwide use graphene extensively in its powder form for various applications such as supercapacitors, solar cells, drug delivery, and polymer composites, owing to its considerably valuable properties. However, relatively few studies have been made on the 3D-hydrogel form of graphene for these applications. Here we report a simple and fresh method to prepare 3D graphene hydrogel (3DGH) and its bimetal composite with tungsten trioxide (WO3) and manganese dioxide (MnO2). The structure of 3DGH and its composite is confirmed by advanced characterization techniques viz. Raman Spectroscopy, X-Ray diffraction (XRD), Fourier-transformed infrared spectroscopy (FT-IR), scanning electron microscope (SEM), and tunneling electron microscope (TEM). Further, two symmetric devices using 3DGH, 3DGH-metal composite (3DGHMC), and one asymmetric 3DGHMC-3DGH device are comparatively studied using two electrode systems. The effects of scan rates, current densities, voltage window, and frequency were examined for each device by cyclic voltammetry (CV), galvanic charge-discharge (GCD), and Electron impedance spectroscopy (EIS). The asymmetric device showed a high specific capacitance of 657 F g−1 with an excellent energy density of 48.25 W h kg−1 and a high-power density of 596.06 W kg−1 at the current density of 1 A g−1. Also, the asymmetric device retains 100 % of its initial capacitance after 1000 charging-discharging cycles, also extends its stability after 1000 cycling test. Moreover, the quantitative analysis of the device is also made by Dunn's method to evaluate the percentage contribution from surface and diffusion capacitance.","PeriodicalId":94331,"journal":{"name":"Journal of energy storage","volume":"58 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135636435","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-09-01DOI: 10.1016/j.est.2023.107681
Lisheng Luo, Yicai Liu, Zimiao Liao, Jie Zhong
This paper develops an X-type double inlet and outlet symmetrical air-cooled battery thermal management system (BTMS) that overcomes the high temperature, large temperature difference, and high power dissipation problems. The proposed method extends previous symmetrical BTMSs, i.e., single inlet and outlet BTMS, single inlet and double outlet BTMS, and double inlet and single outlet BTMS. However, compared with the existing symmetrical BTMS, the suggested X-type BTMS improves performance and reduces the maximum temperature, maximum temperature difference, and maximum power dissipation by 4.33 K, 74 %, and 62.9 %, respectively. Additionally, the inlet and outlet parameters of the X-type BTMS are optimized with orthogonal analysis, and the optimum settings defined as 71 mm near the outlet, 135 mm near the inlet, 90° for the outlet angle, and 150° for the inlet angle, among which the outlet position and inlet angle significantly affect the performance of the BTMS. The original X-type BTMS is optimized to reduce the maximum temperature and maximum temperature difference by 4 K and 76.5 %, respectively. Furthermore, the heat transfer correlation expression for the X-type BTMS is obtained through theoretical analysis within an 8 % deviation, providing a reference for the design of BTMS.
{"title":"Optimal structure design and heat transfer characteristic analysis of X-type air-cooled battery thermal management system","authors":"Lisheng Luo, Yicai Liu, Zimiao Liao, Jie Zhong","doi":"10.1016/j.est.2023.107681","DOIUrl":"https://doi.org/10.1016/j.est.2023.107681","url":null,"abstract":"This paper develops an X-type double inlet and outlet symmetrical air-cooled battery thermal management system (BTMS) that overcomes the high temperature, large temperature difference, and high power dissipation problems. The proposed method extends previous symmetrical BTMSs, i.e., single inlet and outlet BTMS, single inlet and double outlet BTMS, and double inlet and single outlet BTMS. However, compared with the existing symmetrical BTMS, the suggested X-type BTMS improves performance and reduces the maximum temperature, maximum temperature difference, and maximum power dissipation by 4.33 K, 74 %, and 62.9 %, respectively. Additionally, the inlet and outlet parameters of the X-type BTMS are optimized with orthogonal analysis, and the optimum settings defined as 71 mm near the outlet, 135 mm near the inlet, 90° for the outlet angle, and 150° for the inlet angle, among which the outlet position and inlet angle significantly affect the performance of the BTMS. The original X-type BTMS is optimized to reduce the maximum temperature and maximum temperature difference by 4 K and 76.5 %, respectively. Furthermore, the heat transfer correlation expression for the X-type BTMS is obtained through theoretical analysis within an 8 % deviation, providing a reference for the design of BTMS.","PeriodicalId":94331,"journal":{"name":"Journal of energy storage","volume":"28 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135686076","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
The application of lithium metal in batteries is constrained due to high nucleation potential and uneven deposition. Here, we reported that cellulose film protects lithium by a facile and low-cost method, suitable for high-voltage cathodes in carbonate electrolytes. The cellulose layer can well accommodate the deposited lithium and eliminate volume change in the lithium depositing/stripping processes. Cellulose layer nanofibers are transferred to the surface of lithium foil to form a compact layer of cellulose and lithium metal symbiosis. This can homogenize Li-ions distribution and apply as the lithium deposition sites, decreasing nucleation over potential. The symbiotic layer on the surface of lithium foil has the fast Li+ transmission performance of Li2CO3 and LiF, good electronic insulator capability and strong affinity for Li+, respectively. As a result, Li symmetric cells using the cellulose protected Li exhibited excellent cycling stability over 220 h at 3 mA cm−2. The full cells assembled with a NMC811 cathode (loading of 2.68 mA h cm−2) exhibited high-rate capability and excellent cycle stability, with capacity retention of 71.2 % at 400 cycles.
锂金属在电池中的应用受到高成核电位和不均匀沉积的制约。在这里，我们报道了纤维素膜以一种简单和低成本的方法保护锂，适用于碳酸盐电解质中的高压阴极。纤维素层可以很好地容纳沉积的锂，并消除锂沉积/剥离过程中的体积变化。纤维素层纳米纤维转移到锂箔表面，形成致密的纤维素层与金属锂共生。这可以均匀化锂离子的分布，并作为锂沉积的位置，减少超电位成核。锂箔表面的共生层分别具有Li2CO3和LiF对Li+的快速传输性能、良好的电子绝缘体性能和对Li+的强亲和力。结果表明，使用纤维素保护的锂对称电池在3ma cm−2下的220小时内表现出优异的循环稳定性。用NMC811阴极(负载为2.68 mA h cm−2)组装的完整电池具有高倍率性能和优异的循环稳定性，在400次循环时容量保持率为71.2%。
{"title":"Design of symbiosis 3D framework interface for long-life lithium metal batteries","authors":"Ziping Wang, Mingyang Xin, Shuyuan Xie, Hao Sun, Shuang Yu, Yiqi Gong, Haiming Xie, Yulong Liu","doi":"10.1016/j.est.2023.107823","DOIUrl":"https://doi.org/10.1016/j.est.2023.107823","url":null,"abstract":"The application of lithium metal in batteries is constrained due to high nucleation potential and uneven deposition. Here, we reported that cellulose film protects lithium by a facile and low-cost method, suitable for high-voltage cathodes in carbonate electrolytes. The cellulose layer can well accommodate the deposited lithium and eliminate volume change in the lithium depositing/stripping processes. Cellulose layer nanofibers are transferred to the surface of lithium foil to form a compact layer of cellulose and lithium metal symbiosis. This can homogenize Li-ions distribution and apply as the lithium deposition sites, decreasing nucleation over potential. The symbiotic layer on the surface of lithium foil has the fast Li+ transmission performance of Li2CO3 and LiF, good electronic insulator capability and strong affinity for Li+, respectively. As a result, Li symmetric cells using the cellulose protected Li exhibited excellent cycling stability over 220 h at 3 mA cm−2. The full cells assembled with a NMC811 cathode (loading of 2.68 mA h cm−2) exhibited high-rate capability and excellent cycle stability, with capacity retention of 71.2 % at 400 cycles.","PeriodicalId":94331,"journal":{"name":"Journal of energy storage","volume":"4 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135783079","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-09-01DOI: 10.1016/j.est.2023.107619
Zhenwei Wu, Kun Zhang, Chunhui Ma, Sha Luo, Wei Li, Shouxin Liu
Functional porous carbon materials have attracted significant attentions due to their unique characteristics. Herein, the synthesis of N-doped hierarchically porous carbon (N-HPC) with ordered mesopores from liquefied wood is reported through a soft-templating and chemical blowing method with the assistance of NH4Cl to regulate their pore architectures. The NH4Cl strengthens the interactions between the carbon sources and soft templates in the hydrothermal process to produce carbon materials with highly ordered mesostructure after carbonization. Then, the obtained carbon is ground with NH4Cl, where NH4Cl releases NH3 and HCl upon heating to introduce N atoms and micropores into the carbon structures. Highly ordered p6mm mesostructure, high specific surface area (1160 m2 g−1) and nitrogen content of 3.75 wt% are obtained with the assistance of NH4Cl, which together affords them enhanced electrochemical performance for supercapacitors. The obtained N-HPC electrode displays a specific capacitance of 282 F g−1 at 1 A g−1 and good rate capability.
功能多孔碳材料以其独特的性能引起了人们的广泛关注。本文报道了以液化木材为原料，通过软模板和化学吹法制备了具有有序介孔结构的n掺杂分层多孔碳(N-HPC)， NH4Cl调节了其孔隙结构。在水热过程中，NH4Cl加强了碳源与软模板的相互作用，使炭化后的碳材料具有高度有序的介观结构。然后，用NH4Cl研磨得到的碳，NH4Cl加热后释放出NH3和HCl，将N原子和微孔引入碳结构中。在NH4Cl的辅助下，获得了高度有序的p6mm介观结构，高比表面积(1160 m2 g−1)和3.75 wt%的氮含量，这些都使它们具有增强的超级电容器电化学性能。所得的N-HPC电极在1 a g−1时的比电容为282 F g−1，具有良好的倍率性能。
{"title":"Synthesis of nitrogen-doped hierarchically porous carbons with ordered mesopores from liquefied wood: Pore architecture manipulation by NH4Cl for improved electrochemical performance","authors":"Zhenwei Wu, Kun Zhang, Chunhui Ma, Sha Luo, Wei Li, Shouxin Liu","doi":"10.1016/j.est.2023.107619","DOIUrl":"https://doi.org/10.1016/j.est.2023.107619","url":null,"abstract":"Functional porous carbon materials have attracted significant attentions due to their unique characteristics. Herein, the synthesis of N-doped hierarchically porous carbon (N-HPC) with ordered mesopores from liquefied wood is reported through a soft-templating and chemical blowing method with the assistance of NH4Cl to regulate their pore architectures. The NH4Cl strengthens the interactions between the carbon sources and soft templates in the hydrothermal process to produce carbon materials with highly ordered mesostructure after carbonization. Then, the obtained carbon is ground with NH4Cl, where NH4Cl releases NH3 and HCl upon heating to introduce N atoms and micropores into the carbon structures. Highly ordered p6mm mesostructure, high specific surface area (1160 m2 g−1) and nitrogen content of 3.75 wt% are obtained with the assistance of NH4Cl, which together affords them enhanced electrochemical performance for supercapacitors. The obtained N-HPC electrode displays a specific capacitance of 282 F g−1 at 1 A g−1 and good rate capability.","PeriodicalId":94331,"journal":{"name":"Journal of energy storage","volume":"19 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136034799","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-09-01DOI: 10.1016/j.est.2023.107846
Marco Cecchetti, Francesco Toja, Andrea Casalegno, Matteo Zago
Vanadium cross-over is a critical issue in Vanadium Redox Flow Battery consisting in a complex interplay of different mechanisms of which a complete comprehension has not been reached yet. Due to the complexity of the involved phenomena, several models have been developed in literature to investigate vanadium cross-over. However, the conventional approaches for model calibration present a limited set of experiments for the validation preventing a complete understanding of cross-over phenomena. In this work a new and comprehensive approach is proposed. It is based on charge-discharge cycles with fixed exchanged capacity, able to isolate the capacity loss induced by cross-over fluxes, and on the measure of the self-discharge of the single electrolyte solutions by exploiting through-plate reference electrodes. Moreover, a 1D physically-based model of the operation of the battery is developed and calibrated on the data of electrolyte imbalance during charge-discharge cycles at three different current densities to obtain model parameters able to accurately describe the involved physics in different operating conditions. The model is then exploited to investigate the main vanadium transport mechanisms through the membrane and to evaluate the influence of the current density on the vanadium cross-over fluxes, net vanadium transport and self-discharge rate of the electrolyte.
{"title":"A comprehensive experimental and modelling approach for the evaluation of cross-over fluxes in Vanadium Redox Flow Battery","authors":"Marco Cecchetti, Francesco Toja, Andrea Casalegno, Matteo Zago","doi":"10.1016/j.est.2023.107846","DOIUrl":"https://doi.org/10.1016/j.est.2023.107846","url":null,"abstract":"Vanadium cross-over is a critical issue in Vanadium Redox Flow Battery consisting in a complex interplay of different mechanisms of which a complete comprehension has not been reached yet. Due to the complexity of the involved phenomena, several models have been developed in literature to investigate vanadium cross-over. However, the conventional approaches for model calibration present a limited set of experiments for the validation preventing a complete understanding of cross-over phenomena. In this work a new and comprehensive approach is proposed. It is based on charge-discharge cycles with fixed exchanged capacity, able to isolate the capacity loss induced by cross-over fluxes, and on the measure of the self-discharge of the single electrolyte solutions by exploiting through-plate reference electrodes. Moreover, a 1D physically-based model of the operation of the battery is developed and calibrated on the data of electrolyte imbalance during charge-discharge cycles at three different current densities to obtain model parameters able to accurately describe the involved physics in different operating conditions. The model is then exploited to investigate the main vanadium transport mechanisms through the membrane and to evaluate the influence of the current density on the vanadium cross-over fluxes, net vanadium transport and self-discharge rate of the electrolyte.","PeriodicalId":94331,"journal":{"name":"Journal of energy storage","volume":"64 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135781969","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-09-01DOI: 10.1016/j.est.2023.107790
Lin Zhu, Wenjing Zheng, Hongbo Xie, Kan Zhang
Lithium sulfur batteries (LiSBs) are regarded as the promising energy storage technologies because of its high energy density and theoretical capacity, rich sulfur cathode resources, low price and environmental friendliness. However, the utilization rate of sulfur is low and the capacity attenuation is fast due to the insulativity of sulfur, volume expansion/contraction and shuttle effect during charging and discharging, which seriously hinders its commercialization process. In this work, two types of nitrogen and sulfur co-doped carbons were designed and prepared by separating the roots and cotyledons of soybean sprouts. The as-prepared co-doped carbons were used as a coating on the commercial separator. The coated separator can not only physically adsorb polysulfides, but also increase the chemical adsorption of polysulfides due to the introduction of active sites by co-doping, so it can effectively inhibit the shuttle effect. The first discharge capacities of LiS batteries with NS-SSRC and NS-SSCC coated separators at 1C were 847.7 mAh g−1 and 888.1 mAh g−1, respectively, and they retained 389.7 mAh g−1 and 477.6 mAh g−1 after 500 cycles, respectively.
硫锂电池因其高能量密度和理论容量、丰富的硫阴极资源、低廉的价格和环境友好性而被认为是一种很有前途的储能技术。然而，由于硫的绝缘性、充放电过程中的体积膨胀/收缩和穿梭效应，硫的利用率低，容量衰减快，严重阻碍了其商业化进程。本文通过分离豆芽的根和子叶，设计并制备了两种氮硫共掺杂碳。制备的共掺杂碳被用作商用分离器的涂层。包覆分离器不仅可以物理吸附多硫化物，而且由于共掺杂引入了活性位点，增加了多硫化物的化学吸附，因此可以有效地抑制穿梭效应。采用NS-SSRC和NS-SSCC涂层的锂离子电池在1C下的首次放电容量分别为847.7 mAh g−1和888.1 mAh g−1，循环500次后分别保持389.7 mAh g−1和477.6 mAh g−1。
{"title":"Two types of nitrogen and sulfur co-doped carbons derived from soybean sprouts enabling high performance lithium‑sulfur batteries","authors":"Lin Zhu, Wenjing Zheng, Hongbo Xie, Kan Zhang","doi":"10.1016/j.est.2023.107790","DOIUrl":"https://doi.org/10.1016/j.est.2023.107790","url":null,"abstract":"Lithium sulfur batteries (LiSBs) are regarded as the promising energy storage technologies because of its high energy density and theoretical capacity, rich sulfur cathode resources, low price and environmental friendliness. However, the utilization rate of sulfur is low and the capacity attenuation is fast due to the insulativity of sulfur, volume expansion/contraction and shuttle effect during charging and discharging, which seriously hinders its commercialization process. In this work, two types of nitrogen and sulfur co-doped carbons were designed and prepared by separating the roots and cotyledons of soybean sprouts. The as-prepared co-doped carbons were used as a coating on the commercial separator. The coated separator can not only physically adsorb polysulfides, but also increase the chemical adsorption of polysulfides due to the introduction of active sites by co-doping, so it can effectively inhibit the shuttle effect. The first discharge capacities of LiS batteries with NS-SSRC and NS-SSCC coated separators at 1C were 847.7 mAh g−1 and 888.1 mAh g−1, respectively, and they retained 389.7 mAh g−1 and 477.6 mAh g−1 after 500 cycles, respectively.","PeriodicalId":94331,"journal":{"name":"Journal of energy storage","volume":"35 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136081124","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-09-01DOI: 10.1016/j.est.2023.107804
Kavita Singh, Mamta Dahiya, Ashish Grover, Richa Adlakha, Mohammad Amir
Frequency deviations occur when load frequency control(LFC) is incompetent to bridge the gap between supply and demand. Thus, this paper presents the effective (1 + TD)-TID cascade regulator to this significant field. The regulator is efficient to execute, and it interfaces the yield of 1 + TD regulator with all the inputs of TID regulator. Here, the power deviation of tie-line and frequency are employed to the TID regulator, which is referred to as the feedback signals. An imperialist competitive algorithm (ICA) is employed for tuning the controller design variables. The primary aim of this study is to examine the LFC issue and further exploration of 2 area thermal systems coordinated with renewable energy sources (RES) like solar PV, wind, and fuel cell with nonlinearities like governor dead band (DB) unit; reheat based turbine, and the generation rate constraints (GRC). The efficacy the of proposed control strategy are investigated in contrast with those of other common works, which disclose not only its simple structure but also, the ICA enhanced (1 + TD)-TID technique gives the smallest values of the performance index (0.091) compare to TIDF (0.372), PIDF (0.467) and least settling time (24.7 s) in contrast to TID (22.8 s) and PIDF (10s). Hence proposed control strategy shows efficient response with lesser oscillations and fast response. The sturdiness of suggested controller is also corroborated with nonlinearities and parameter variations of ±25% . The examination has been additionally improved by integrating a redox flow battery (RFB) in the proposed framework.
{"title":"An effective cascade control strategy for frequency regulation of renewable energy based hybrid power system with energy storage system","authors":"Kavita Singh, Mamta Dahiya, Ashish Grover, Richa Adlakha, Mohammad Amir","doi":"10.1016/j.est.2023.107804","DOIUrl":"https://doi.org/10.1016/j.est.2023.107804","url":null,"abstract":"Frequency deviations occur when load frequency control(LFC) is incompetent to bridge the gap between supply and demand. Thus, this paper presents the effective (1 + TD)-TID cascade regulator to this significant field. The regulator is efficient to execute, and it interfaces the yield of 1 + TD regulator with all the inputs of TID regulator. Here, the power deviation of tie-line and frequency are employed to the TID regulator, which is referred to as the feedback signals. An imperialist competitive algorithm (ICA) is employed for tuning the controller design variables. The primary aim of this study is to examine the LFC issue and further exploration of 2 area thermal systems coordinated with renewable energy sources (RES) like solar PV, wind, and fuel cell with nonlinearities like governor dead band (DB) unit; reheat based turbine, and the generation rate constraints (GRC). The efficacy the of proposed control strategy are investigated in contrast with those of other common works, which disclose not only its simple structure but also, the ICA enhanced (1 + TD)-TID technique gives the smallest values of the performance index (0.091) compare to TIDF (0.372), PIDF (0.467) and least settling time (24.7 s) in contrast to TID (22.8 s) and PIDF (10s). Hence proposed control strategy shows efficient response with lesser oscillations and fast response. The sturdiness of suggested controller is also corroborated with nonlinearities and parameter variations of ±25% . The examination has been additionally improved by integrating a redox flow battery (RFB) in the proposed framework.","PeriodicalId":94331,"journal":{"name":"Journal of energy storage","volume":"36 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135636434","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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