Journal of Power Sources最新文献

英文中文

Synergistic effect of redox-active SrMnO3/g-C3N4 electrode materials for supercapattery hybrid energy storage devices and electrochemical sensing of hydroquinone 氧化还原活性 SrMnO3/g-C3N4 电极材料在超级电池混合储能设备和对苯二酚电化学传感中的协同效应

IF 8.1 2区工程技术 Q1 CHEMISTRY, PHYSICAL

Journal of Power Sources

Pub Date : 2025-03-15 DOI: 10.1016/j.jpowsour.2025.236761

Ehtisham Umar , M. Waqas Iqbal , Fozia Shaheen , Hameed Ullah , Rizwan Wahab , Rizwan Ul Hassan

Transition-metal oxides are attracting significant interest as potential energy storage materials and electrochemical sensors for hydroquinone (HQ) detection due to their exceptional redox properties, electrochemical activity, and abundance of electroactive sites. However, their practical application is hindered by challenges such as limited electrochemical stability and electrical conductivity, which restrict their economic viability. A sensitive sensor is developed featuring 2D g-C₃N₄ nanosheet networks decorated with strontium manganite nanoparticles, referred to as SrMnO₃/g-C₃N₄, for applications in supercapacitors and electrochemical sensing. The designed hybrid-type devices exhibit a energy density of 84.8 Wh/kg and a power density of 1190.3 W/kg while maintaining robust stability over 10,000 cycles with a capacitive retention of 86 % and a coulombic efficiency of 95 %. Dunn's model clarifies the faradaic and non-faradic contributions in the fabricated device, demonstrating how its capacitive and diffusive contributions relate to the scan rate. The fabricated sensing device is used for the electrochemical detection of HQ. The SrMnO₃/g-C₃N₄-modified GCE demonstrates enhanced performance, with a low limit of detection (LOD) of 6.32 μM over a broad linear range of 1–600 μM. Furthermore, the SrMnO₃/g-C₃N₄-modified electrode shows high sensitivity, achieving a 0.214 μA μM⁻¹ cm⁻² value. The sensor proves its practicality and recovery performance through real sample wastewater and tap water analysis.

{"title":"Synergistic effect of redox-active SrMnO3/g-C3N4 electrode materials for supercapattery hybrid energy storage devices and electrochemical sensing of hydroquinone","authors":"Ehtisham Umar , M. Waqas Iqbal , Fozia Shaheen , Hameed Ullah , Rizwan Wahab , Rizwan Ul Hassan","doi":"10.1016/j.jpowsour.2025.236761","DOIUrl":"10.1016/j.jpowsour.2025.236761","url":null,"abstract":"<div><div>Transition-metal oxides are attracting significant interest as potential energy storage materials and electrochemical sensors for hydroquinone (HQ) detection due to their exceptional redox properties, electrochemical activity, and abundance of electroactive sites. However, their practical application is hindered by challenges such as limited electrochemical stability and electrical conductivity, which restrict their economic viability. A sensitive sensor is developed featuring 2D g-C<sub>3</sub>N<sub>4</sub> nanosheet networks decorated with strontium manganite nanoparticles, referred to as SrMnO<sub>3</sub>/g-C<sub>3</sub>N<sub>4</sub>, for applications in supercapacitors and electrochemical sensing. The designed hybrid-type devices exhibit a energy density of 84.8 Wh/kg and a power density of 1190.3 W/kg while maintaining robust stability over 10,000 cycles with a capacitive retention of 86 % and a coulombic efficiency of 95 %. Dunn's model clarifies the faradaic and non-faradic contributions in the fabricated device, demonstrating how its capacitive and diffusive contributions relate to the scan rate. The fabricated sensing device is used for the electrochemical detection of HQ. The SrMnO<sub>3</sub>/g-C<sub>3</sub>N<sub>4</sub>-modified GCE demonstrates enhanced performance, with a low limit of detection (LOD) of 6.32 μM over a broad linear range of 1–600 μM. Furthermore, the SrMnO<sub>3</sub>/g-C<sub>3</sub>N<sub>4</sub>-modified electrode shows high sensitivity, achieving a 0.214 μA μM<sup>−1</sup> cm<sup>−2</sup> value. The sensor proves its practicality and recovery performance through real sample wastewater and tap water analysis.</div></div>","PeriodicalId":377,"journal":{"name":"Journal of Power Sources","volume":"640 ","pages":"Article 236761"},"PeriodicalIF":8.1,"publicationDate":"2025-03-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143628338","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}

引用次数: 0

Low-dimensional design of precious metal-based catalysts in fuel cells

IF 8.1 2区工程技术 Q1 CHEMISTRY, PHYSICAL

Journal of Power Sources

Pub Date : 2025-03-15 DOI: 10.1016/j.jpowsour.2025.236772

Peixi Qiu , Chengyong Shu , Zhoufan Gan , Jingwen Cao , Zhixu Chen , Hao Wu , Yuping Wu , Wei Tang

The development of low-dimensional noble metal catalysts has emerged as a critical pathway to address the cost-durability challenges in fuel cells. This review synthesizes recent advances in designing ultrathin nanowires, defect-engineered metalene, and strain-tuned nanosheets that demonstrate exceptional oxygen reduction SSreaction activity and cycling stability. We systematically decode three atomic-level enhancement mechanisms: (1) ligand effect-mediated d-band center downshifting, (2) optimized compressive strain, and (3) regulated ∗OOH adsorption energetics. The structural-activity relationships established here provide practical strategies for fabricating hybrid catalysts with ultralow noble metal loading and enhanced CO tolerance. Such atomic-level insights not only guide the rational design of catalysts, but also facilitate the deployment of fuel cells in maritime propulsion systems and backup power units.

引用次数: 0

Quantitative safety assessment of lithium-ion batteries: Integrating abuse risks and intrinsic safety

IF 8.1 2区工程技术 Q1 CHEMISTRY, PHYSICAL

Journal of Power Sources

Pub Date : 2025-03-15 DOI: 10.1016/j.jpowsour.2025.236789

Meng Wang, Senming Wu, Ying Chen, Shengnan Wang, Haofeng Chen, Weiling Luan

Lithium-ion batteries (LIBs) safety have become a critical concern with increasing use across various applications. Existing methods for assessing LIB safety predominantly focus on isolated abuse conditions, often neglecting the combined impact of both intrinsic risks and safety factors, especially in aged batteries. In this study, a multi-factor quantitative assessment method for the safety of LIBs is proposed based on the fuzzy analytic hierarchy process (FAHP). Characteristic parameters with the highest correlation are extracted via analysis of intrinsic and abuse safety. In the proposed method, both simplified engineering model (SEM) and generalized system model (GSM) are established for the quantitative safety assessment and grading of fresh and aged batteries. A case study of LIBs using lithium cobalt oxide (LCO) cathode materials demonstrates that gas generation significantly increases safety risks, while aging reduces risks under thermal and electrical abuse but does not affect mechanical abuse. The findings highlight that swollen batteries have elevated risks due to gas generation, emphasizing the importance of monitoring aging effects in battery safety. The SEM has the advantages of simplicity for engineering applications, while the GSM is more comprehensive and accurate. This study provides a reliable and effective approach for the management and recycling of LIBs.

{"title":"Quantitative safety assessment of lithium-ion batteries: Integrating abuse risks and intrinsic safety","authors":"Meng Wang, Senming Wu, Ying Chen, Shengnan Wang, Haofeng Chen, Weiling Luan","doi":"10.1016/j.jpowsour.2025.236789","DOIUrl":"10.1016/j.jpowsour.2025.236789","url":null,"abstract":"<div><div>Lithium-ion batteries (LIBs) safety have become a critical concern with increasing use across various applications. Existing methods for assessing LIB safety predominantly focus on isolated abuse conditions, often neglecting the combined impact of both intrinsic risks and safety factors, especially in aged batteries. In this study, a multi-factor quantitative assessment method for the safety of LIBs is proposed based on the fuzzy analytic hierarchy process (FAHP). Characteristic parameters with the highest correlation are extracted via analysis of intrinsic and abuse safety. In the proposed method, both simplified engineering model (SEM) and generalized system model (GSM) are established for the quantitative safety assessment and grading of fresh and aged batteries. A case study of LIBs using lithium cobalt oxide (LCO) cathode materials demonstrates that gas generation significantly increases safety risks, while aging reduces risks under thermal and electrical abuse but does not affect mechanical abuse. The findings highlight that swollen batteries have elevated risks due to gas generation, emphasizing the importance of monitoring aging effects in battery safety. The SEM has the advantages of simplicity for engineering applications, while the GSM is more comprehensive and accurate. This study provides a reliable and effective approach for the management and recycling of LIBs.</div></div>","PeriodicalId":377,"journal":{"name":"Journal of Power Sources","volume":"640 ","pages":"Article 236789"},"PeriodicalIF":8.1,"publicationDate":"2025-03-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143628342","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}

引用次数: 0

Experimental and mathematical modeling of mass transfer dynamics of hydrogen bubbles on textured electrodes during electrochemical water splitting

IF 8.1 2区工程技术 Q1 CHEMISTRY, PHYSICAL

Journal of Power Sources

Pub Date : 2025-03-15 DOI: 10.1016/j.jpowsour.2025.236630

Mohsen Saeidi , Kaivan Mohammadi , MahsaSadat Adel Rastkhiz , Mina Orouji , Mostafa Jamshidian , Stanislav A. Evlashin , Jing Bai , Abdolreza Simchi

The interplay between bubble release dynamics and surface wettability profoundly influences the performance of water dissociation systems; a topic not well understood. To systematically study the effect of electrode geometry and wettability, we have employed additive manufacturing to fabricate textured 316L-stainless steel electrodes composed of well-arranged pillars with different geometries and hydrophilicity. Through combined experimental and simulation approaches using bubbly flow models, we demonstrate that geometrically-induced wettability significantly affects hydrogen bubble dynamics, transitioning from gas-filled to liquid-filled states, and modulates bubble growth and detachment mechanisms. It is shown that the kinetics of bubble release and the surface coverage on hemispherical-topped pillars can finely be tuned to reduce the transport overpotential by 68.8 % and to increase the Faradaic efficiency (

F E

) by 191.5 % at −300 mA cm⁻² relative to untextured electrodes. These findings delineate a pragmatic approach toward the design of textured electrodes for efficient gas-evolving reactions.

{"title":"Experimental and mathematical modeling of mass transfer dynamics of hydrogen bubbles on textured electrodes during electrochemical water splitting","authors":"Mohsen Saeidi , Kaivan Mohammadi , MahsaSadat Adel Rastkhiz , Mina Orouji , Mostafa Jamshidian , Stanislav A. Evlashin , Jing Bai , Abdolreza Simchi","doi":"10.1016/j.jpowsour.2025.236630","DOIUrl":"10.1016/j.jpowsour.2025.236630","url":null,"abstract":"<div><div>The interplay between bubble release dynamics and surface wettability profoundly influences the performance of water dissociation systems; a topic not well understood. To systematically study the effect of electrode geometry and wettability, we have employed additive manufacturing to fabricate textured 316L-stainless steel electrodes composed of well-arranged pillars with different geometries and hydrophilicity. Through combined experimental and simulation approaches using bubbly flow models, we demonstrate that geometrically-induced wettability significantly affects hydrogen bubble dynamics, transitioning from gas-filled to liquid-filled states, and modulates bubble growth and detachment mechanisms. It is shown that the kinetics of bubble release and the surface coverage on hemispherical-topped pillars can finely be tuned to reduce the transport overpotential by 68.8 % and to increase the Faradaic efficiency (<span><math><mrow><mi>F</mi><mi>E</mi></mrow></math></span>) by 191.5 % at −300 mA cm<sup>−2</sup> relative to untextured electrodes. These findings delineate a pragmatic approach toward the design of textured electrodes for efficient gas-evolving reactions.</div></div>","PeriodicalId":377,"journal":{"name":"Journal of Power Sources","volume":"640 ","pages":"Article 236630"},"PeriodicalIF":8.1,"publicationDate":"2025-03-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143628257","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}

引用次数: 0

Flash calcination breaks the mechanical and catalytical behavior trade-off of alkaline oxygen evolution reaction electrodes

IF 8.1 2区工程技术 Q1 CHEMISTRY, PHYSICAL

Journal of Power Sources

Pub Date : 2025-03-15 DOI: 10.1016/j.jpowsour.2025.236787

Liming Jin , Tong Sun , Zijun Cheng , Luyu Yang , Feifei Li , Zijian Gao , Zhen Geng , Jim P. Zheng , Cunman Zhang

The mechanical stability of the electrode structure is crucial for the stable operation of alkaline water electrolyzers (ALK) under industrial conditions. Calcination is a universal method to enhance the mechanical strength of electrodes. However, while ensuring reliable mechanical strength, the impact of calcination on electrode performance lacks assessment, which limits the catalytic potential of the electrodes. In this work, flash calcination is used to enhance the mechanical strength of electrodes prepared by electrodeposition, and the calcination boundary conditions necessary for obtaining reliable strength are determined. Furthermore, physical characterization and electrochemical tests reveal that calcination reduces the Oxygen Evolution Reaction (OER) activity by causing material agglomeration and reducing the number of hydroxyl adsorption sites on the surface. High-temperature short-time calcination by flash calcination could almost eliminate this negative effect to break the mechanical and catalytical behavior trade-off that the electrodes with or without calcination exhibited nearly the same initial voltage at 3000 A m⁻² in ALK. After running for 100 h, no increase in voltage was observed in the flash-calcined electrodes, whereas the uncalcined electrodes showed an increase of about 110 mV. This work establishes the structure-activity-stability relationships mediated by calcination for electrode structures and catalytic activity, providing guidance for the design of the next generation of high-activity, high-stability water electrolyzing electrodes.

{"title":"Flash calcination breaks the mechanical and catalytical behavior trade-off of alkaline oxygen evolution reaction electrodes","authors":"Liming Jin , Tong Sun , Zijun Cheng , Luyu Yang , Feifei Li , Zijian Gao , Zhen Geng , Jim P. Zheng , Cunman Zhang","doi":"10.1016/j.jpowsour.2025.236787","DOIUrl":"10.1016/j.jpowsour.2025.236787","url":null,"abstract":"<div><div>The mechanical stability of the electrode structure is crucial for the stable operation of alkaline water electrolyzers (ALK) under industrial conditions. Calcination is a universal method to enhance the mechanical strength of electrodes. However, while ensuring reliable mechanical strength, the impact of calcination on electrode performance lacks assessment, which limits the catalytic potential of the electrodes. In this work, flash calcination is used to enhance the mechanical strength of electrodes prepared by electrodeposition, and the calcination boundary conditions necessary for obtaining reliable strength are determined. Furthermore, physical characterization and electrochemical tests reveal that calcination reduces the Oxygen Evolution Reaction (OER) activity by causing material agglomeration and reducing the number of hydroxyl adsorption sites on the surface. High-temperature short-time calcination by flash calcination could almost eliminate this negative effect to break the mechanical and catalytical behavior trade-off that the electrodes with or without calcination exhibited nearly the same initial voltage at 3000 A m<sup>−2</sup> in ALK. After running for 100 h, no increase in voltage was observed in the flash-calcined electrodes, whereas the uncalcined electrodes showed an increase of about 110 mV. This work establishes the structure-activity-stability relationships mediated by calcination for electrode structures and catalytic activity, providing guidance for the design of the next generation of high-activity, high-stability water electrolyzing electrodes.</div></div>","PeriodicalId":377,"journal":{"name":"Journal of Power Sources","volume":"640 ","pages":"Article 236787"},"PeriodicalIF":8.1,"publicationDate":"2025-03-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143628258","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}

引用次数: 0

State of charge estimation for lithium-ion batteries based on physics-embedded neural network

IF 8.1 2区工程技术 Q1 CHEMISTRY, PHYSICAL

Journal of Power Sources

Pub Date : 2025-03-15 DOI: 10.1016/j.jpowsour.2025.236785

Peichao Li, Shaoxiao Ju, Shixing Bai, Han Zhao, Hengyun Zhang

Expansion of lithium-ion batteries (LIBs) impacts performance and safety. Therefore, accurately estimating the state of swelling displacement (SoD) and state of charge (SoC) is crucial for battery health management. However, SoC estimation methods often ignore the impact of expansion on battery performance, leading to estimation errors. To address this issue, this paper proposes a convolutional neural network (CNN)-long short-term memory (LSTM) estimation framework embedded with physical information. First, at the physical level, the relationship between displacement and charge state is analyzed using an electrochemical-mechanical coupling model, which provides certain prior physical knowledge for subsequent estimation. At the mathematical level, Pearson correlation analysis is used to quantify the correlation between displacement and SoC. Next, a CNN-LSTM framework is employed to estimate the displacement and use it as key physical information for SoC estimation. Finally, the proposed method is validated using test data under various operating conditions. The results show that the accuracy of SoC estimation is significantly improved with including displacement, with the mean absolute error (MAE) reduced by about 16.07 % compared to when displacement is not included. The proposed method depicts good prediction accuracy and computational efficiency under different charge-discharge rates, validating the effectiveness of displacement as key physical information.

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引用次数: 0

Enhancing tunneling, microstructural morphology, and electrochemical performance of carbon fiber substituted ternary alloys (Mg-Ni-Ti) synthesized via mechanical alloying for hydrogen storage applications: Activation energy reduction and hydrophobic benefits

IF 8.1 2区工程技术 Q1 CHEMISTRY, PHYSICAL

Journal of Power Sources

Pub Date : 2025-03-15 DOI: 10.1016/j.jpowsour.2025.236525

K.S. Nivedhitha , T. Beena , R. Venkatesh , N.R. Banapurmath , K. Ramesh , Ashok M. Sajjan , N.H. Ayachit , Bipin S. Chikkatti , M.A. Umarfarooq , K. Subramanian , Manzoore Elahi M. Soudagar , Sagar Shelare , Shubham Sharma , Ehab El Sayed Massoud

This study focuses on the preparation of Mg-Ni-Ti ternary alloys substituted with varying weight ratios of carbon fiber, synthesized using mechanical alloying for hydrogen storage applications. X-ray diffraction (XRD) analysis confirms the presence of carbon in the ternary alloy at 2θ = 71° along with the ternary alloy characteristic peaks. The substitution of carbon fiber increases the dislocation density from 5.3x10⁻³ nm⁻² to 7.845x10⁻³ nm⁻² and significantly enhances the strain within the samples. Selected area diffraction (SAED) confirms the formation of alloys as well presence of carbon. High-resolution Transmission Electron Microscopy shows carbon encapsulated in metal alloy particles, which helps as a barrier to resist the corrosion of metal alloy. Carbon fiber substitution lowers the activation energy of Mg-Ti-Ni from 79.96 kJ/mol to 65.54 kJ/mol, as estimated by Kissinger's analysis. Cyclic Voltammetry (CV) analysis for the alloy substituted with carbon fiber has unveiled a more substantial reduction peak than the oxidation peak, attributed to the hydrophobic nature of carbon fiber. The oxidation property of carbon fiber also reduces the corrosion rate from 0.146 mgpy to 0.083 mgpy. Hydrogen absorption/desorption studies for carbon fiber substituted ternary alloy have indicated that the ternary alloy with 5 wt% carbon fiber substitution has achieved a maximum higher discharge capacity of 1020 mAhg⁻¹.

{"title":"Enhancing tunneling, microstructural morphology, and electrochemical performance of carbon fiber substituted ternary alloys (Mg-Ni-Ti) synthesized via mechanical alloying for hydrogen storage applications: Activation energy reduction and hydrophobic benefits","authors":"K.S. Nivedhitha , T. Beena , R. Venkatesh , N.R. Banapurmath , K. Ramesh , Ashok M. Sajjan , N.H. Ayachit , Bipin S. Chikkatti , M.A. Umarfarooq , K. Subramanian , Manzoore Elahi M. Soudagar , Sagar Shelare , Shubham Sharma , Ehab El Sayed Massoud","doi":"10.1016/j.jpowsour.2025.236525","DOIUrl":"10.1016/j.jpowsour.2025.236525","url":null,"abstract":"<div><div>This study focuses on the preparation of Mg-Ni-Ti ternary alloys substituted with varying weight ratios of carbon fiber, synthesized using mechanical alloying for hydrogen storage applications. X-ray diffraction (XRD) analysis confirms the presence of carbon in the ternary alloy at 2θ = 71° along with the ternary alloy characteristic peaks. The substitution of carbon fiber increases the dislocation density from 5.3x10<sup>−3</sup> nm<sup>−2</sup> to 7.845x10<sup>−3</sup> nm<sup>−2</sup> and significantly enhances the strain within the samples. Selected area diffraction (SAED) confirms the formation of alloys as well presence of carbon. High-resolution Transmission Electron Microscopy shows carbon encapsulated in metal alloy particles, which helps as a barrier to resist the corrosion of metal alloy. Carbon fiber substitution lowers the activation energy of Mg-Ti-Ni from 79.96 kJ/mol to 65.54 kJ/mol, as estimated by Kissinger's analysis. Cyclic Voltammetry (CV) analysis for the alloy substituted with carbon fiber has unveiled a more substantial reduction peak than the oxidation peak, attributed to the hydrophobic nature of carbon fiber. The oxidation property of carbon fiber also reduces the corrosion rate from 0.146 mgpy to 0.083 mgpy. Hydrogen absorption/desorption studies for carbon fiber substituted ternary alloy have indicated that the ternary alloy with 5 wt% carbon fiber substitution has achieved a maximum higher discharge capacity of 1020 mAhg<sup>−1</sup>.</div></div>","PeriodicalId":377,"journal":{"name":"Journal of Power Sources","volume":"640 ","pages":"Article 236525"},"PeriodicalIF":8.1,"publicationDate":"2025-03-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143628340","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}

引用次数: 0

Nb-doped NaNi1/3Fe1/3Mn1/3O2 and its high-voltage performance as sodium-ion battery cathode

IF 8.1 2区工程技术 Q1 CHEMISTRY, PHYSICAL

Journal of Power Sources

Pub Date : 2025-03-14 DOI: 10.1016/j.jpowsour.2025.236701

Liwei Dong , Wei Wu , Zhenming Xu , Yaohua Xiang , Zhongzhu Liu , Yuqiao Jiang , Zhenhui Liu , Robson Monteiro , Luanna Parreira , Hui Dou , Mingbo Zheng , Yongyao Xia

O3-NaNi_1/3Fe_1/3Mn_1/3O₂ (NFM) becomes one of the primary cathode materials for sodium-ion batteries due to its low cost, high capacity, and easy preparation. However, its slow diffusion kinetics and severe lattice distortion at high voltage significantly affect its electrochemical performance. In this study, Nb doping is applied to NFM using the sol-gel method to enhance its electrochemical properties. Both the theoretical calculations and experimental results indicate that Nb doping not only reduces the migration energy barrier for Na ions but also stabilizes the crystal structure. The Nb-doped NFM material retains 83.7 % of its initial capacity after 100 cycles at a voltage range of 2–4.2V and a 1C current density. When the current density increases from 0.1C to 10C, the capacity retention rate reaches 48.25 %, significantly higher than the 27.76 % retention rate of the undoped sample. These findings provide new insights into the mechanism of Nb doping for improving the high-voltage stability of O3-type materials and hold valuable implications for further optimization of cathode materials in sodium-ion batteries.

{"title":"Nb-doped NaNi1/3Fe1/3Mn1/3O2 and its high-voltage performance as sodium-ion battery cathode","authors":"Liwei Dong , Wei Wu , Zhenming Xu , Yaohua Xiang , Zhongzhu Liu , Yuqiao Jiang , Zhenhui Liu , Robson Monteiro , Luanna Parreira , Hui Dou , Mingbo Zheng , Yongyao Xia","doi":"10.1016/j.jpowsour.2025.236701","DOIUrl":"10.1016/j.jpowsour.2025.236701","url":null,"abstract":"<div><div>O3-NaNi<sub>1/3</sub>Fe<sub>1/3</sub>Mn<sub>1/3</sub>O<sub>2</sub> (NFM) becomes one of the primary cathode materials for sodium-ion batteries due to its low cost, high capacity, and easy preparation. However, its slow diffusion kinetics and severe lattice distortion at high voltage significantly affect its electrochemical performance. In this study, Nb doping is applied to NFM using the sol-gel method to enhance its electrochemical properties. Both the theoretical calculations and experimental results indicate that Nb doping not only reduces the migration energy barrier for Na ions but also stabilizes the crystal structure. The Nb-doped NFM material retains 83.7 % of its initial capacity after 100 cycles at a voltage range of 2–4.2V and a 1C current density. When the current density increases from 0.1C to 10C, the capacity retention rate reaches 48.25 %, significantly higher than the 27.76 % retention rate of the undoped sample. These findings provide new insights into the mechanism of Nb doping for improving the high-voltage stability of O3-type materials and hold valuable implications for further optimization of cathode materials in sodium-ion batteries.</div></div>","PeriodicalId":377,"journal":{"name":"Journal of Power Sources","volume":"640 ","pages":"Article 236701"},"PeriodicalIF":8.1,"publicationDate":"2025-03-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143619458","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}

引用次数: 0

Long carbon fibers boost performance of dry processed Li-ion battery electrodes 长碳纤维提高了干法锂离子电池电极的性能

IF 8.1 2区工程技术 Q1 CHEMISTRY, PHYSICAL

Journal of Power Sources

Pub Date : 2025-03-14 DOI: 10.1016/j.jpowsour.2025.236603

Junbin Choi , Georgios Polyzos , H.E. Humphrey , Michael Toomey , Nihal Kanbargi , Amit Naskar , Ilias Belharouak , Jaswinder Sharma

Dry processing (DP) is an advanced manufacturing technique for lithium-ion battery (LIB) electrodes. Unlike conventional wet-process-based manufacturing that involves dissolving polyvinylidene fluoride (PVDF) binder in n-methyl-2-pyrrolidone (NMP) solvent for slurry-casting, DP involves fibrillation of polymer binders. This method offers environmental and cost benefits by eliminating the need for expensive and environmentally hazardous organic solvents. However, DP-produced electrode films often lack mechanical stability due to the absence of a current collector substrate during electrode material layer fabrication. This reduced mechanical instability results in difficulty during fabricating of thin electrodes (≈5 mAh/cm²). To address this issue, long (>8 mm) carbon fiber (CF) has been incorporated to reinforce the mechanical strength of the electrode films. The study demonstrates that the inclusion of long carbon fiber boosts the mechanical, electrical, thermal, and electrochemical performance of DP electrodes.

干法加工（DP）是一种先进的锂离子电池（LIB）电极制造技术。传统的湿法制造工艺是将聚偏二氟乙烯（PVDF）粘合剂溶解在正甲基吡咯烷酮（NMP）溶剂中进行浆料浇铸，而干法工艺则不同，它是将聚合物粘合剂纤维化。这种方法无需使用昂贵且对环境有害的有机溶剂，因此具有环保和成本优势。然而，由于在电极材料层制造过程中没有集流基底，DP 生产的电极薄膜往往缺乏机械稳定性。机械稳定性的降低导致在制造薄电极（≈5 mAh/cm2）时遇到困难。为了解决这个问题，我们加入了长（8 毫米）碳纤维 (CF) 来增强电极薄膜的机械强度。研究表明，加入长碳纤维可提高 DP 电极的机械、电、热和电化学性能。

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引用次数: 0

Enhancing the performance of Li-rich oxide cathodes through multifunctional surface engineering

IF 8.1 2区工程技术 Q1 CHEMISTRY, PHYSICAL

Journal of Power Sources

Pub Date : 2025-03-14 DOI: 10.1016/j.jpowsour.2025.236717

Tongxing Lei , Guolin Cao , Xiuling Shi , Bin Cao , Zhiyu Ding , Yu Bai , Junwei Wu , Kaikai Li , Tongyi Zhang

The commercial development of lithium-rich manganese-based cathode materials is limited by severe capacity decay, voltage attenuation and poor rate capability. Herein, a multifunctional surface engineering is successfully applied to improve Li_1.2Mn_0.54Co_0.13Ni_0.13O₂ materials by a facile method of solution pretreatment followed by high-temperature thermal treatment. Gradient fluorine doping on the near-surface region is demonstrated to induce the higher ratio of Mn³⁺/Mn⁴⁺, the increasing amounts of oxygen vacancies and the decreasing Li⁺ diffusion energy barrier. Fast-ion-conductivity spinel phase of LiMn₂O₄ is spontaneously formed on the subsurface and the outmost coating layer that consists of Li₃PO₄ and LiF is constructed on the surface. The formed heterogeneous layers could not only facilitate Li ⁺ rapid transport but also effectively stabilize the surficial structure. The optimal sample is demonstrated to exhibit superior cycling stability and rate capability. The capacity retention after 200 cycles at 1 C is improved from 67.7 % to 91.0 % and the specific capacity at 8 C is increased from 81.9 to 140.8 mAh/g. The voltage attenuation is significantly mitigated, decreasing from 2.02 to 1.05 mV per cycle. The encouraging results may promote the practical application of lithium-rich manganese-based cathode materials in high-energy-density lithium-ion batteries.

富锂锰基正极材料的商业开发受到严重的容量衰减、电压衰减和速率能力差的限制。本文采用溶液预处理再高温热处理的简便方法，成功应用多功能表面工程技术改进了 Li1.2Mn0.54Co0.13Ni0.13O2 材料。实验证明，在近表面区域的梯度氟掺杂可以提高 Mn3+/Mn4+ 的比例，增加氧空位的数量，降低 Li+ 扩散能垒。在次表面自发形成了快离子导电尖晶石相 LiMn2O4，并在表面构建了由 Li3PO4 和 LiF 组成的最外层涂层。形成的异质层不仅能促进 Li + 的快速传输，还能有效稳定表面结构。实验证明，最佳样品具有优异的循环稳定性和速率能力。在 1 C 下循环 200 次后，容量保持率从 67.7% 提高到 91.0%，8 C 下的比容量从 81.9 mAh/g 提高到 140.8 mAh/g。电压衰减明显减轻，从每循环 2.02 mV 下降到 1.05 mV。这些令人鼓舞的结果可能会促进富锂锰基正极材料在高能量密度锂离子电池中的实际应用。

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