首页|Dual-additives enable stable electrode-electrolyte interfaces for long life Li-SPAN batteries

Dual-additives enable stable electrode-electrolyte interfaces for long life Li-SPAN batteries

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Sulfurized polyacrylonitrile(SPAN)is proposed as a promising cathode material for lithium sulfur bat-teries.However,the continuous side reactions at the electrolyte-electrode interfaces as well as the slow redox kinetics of SPAN cathode deteriorate the electrochemical performance.In this study,an electrolyte with dual-additives comprising 2-fluoropyridine(2-FP)and lithium difluorobis(oxalato)phosphate(LiDF-BOP)was used to improve the performance of Li‖ SPAN cells.2-FP has a lower lowest occupied molecular orbital energy than that of the solvents in the electrolyte,leading to its prior reduction.A LiF-rich film can be formed on the electrode,effectively improving the stability of the electrolyte-electrode interfaces and prolonging the life.Simultaneously,LiDFBOP could form an electrolyte-electrode interface film contain-ing a large amount of LixPOyFz species,compensating for the kinetic deterioration caused by the lower ionic conductive of LiF formed at the electrolyte-electrode interface.Hence,an electrode-interface film with good chemical stability and high Li+transport was established by LiF and LixPOyFz-rich species.The Li‖SPAN cell with the electrolyte containing dual-additives demonstrates an excellent capacity retention of 97.5％after 200 cycles at 1.0 C,25 ℃,comparing to 56.2％capacity retention without additives.More-over,the rate capacities of cells with dual-additives can reach 1128.1 mAh/g at 5 C,comparing to only 813.5 mAh/g using electrolyte without additives.Our results shown that the dual-additives in electrolyte provide a promising strategy for practical application of lithium sulfur batteries with SPAN cathodes.

Sulfurized polyacrylonitrileLithium metalInterface film2-FluoropyridineDifluorobis(oxalato)phosphate

Zhenqiang Guo、Huicong Yang、Qian Wei、Shengjun Xu、Guangjian Hu、Shuo Bai、Feng Li

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School of Materials Science and Engineering,University of Science and Technology of China,Shenyang 110016,China

Shenyang National Laboratory for Materials Science,Institute of Metal Research,Chinese Academy of Sciences,Shenyang 110016,China

Shenyang King Power Technology Co.,Ltd.,Shenyang 110016,China

Department of Biochemistry and Molecular Biology,College of Life Science,China Medical University,Shenyang 110122,China

Dalian National Laboratory for Clean Energy,Dalian 116023,China

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国家自然科学基金国家自然科学基金国家重点研发计划中国科学院战略规划重点项目中国科学院战略规划重点项目Shenyang Science and Technology Program

52072378222091892022YFB3803400XDA220106022022YFB380340022-322-3-19

2024

10.1016/j.cclet.2023.108622

中国化学快报(英文版)
中国化学会

中国化学快报(英文版)

CSTPCD
影响因子：0.771
ISSN：1001-8417
年,卷(期)：2024.35(5)
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