储能科学与技术 ›› 2023, Vol. 12 ›› Issue (3): 792-807.doi: 10.19799/j.cnki.2095-4239.2022.0650

• 储能材料与器件 • 上一篇    下一篇

锂离子电池低温电解液的研究进展

封迈1,2,3(), 陈楠1,2(), 陈人杰1,2   

  1. 1.北京理工大学前沿技术研究院,山东 济南 250300
    2.北京理工大学材料学院,北京 100081
    3.黑龙江科技大学环境与化工学院,黑龙江 哈尔滨 150020
  • 收稿日期:2022-11-04 修回日期:2022-12-07 出版日期:2023-03-05 发布日期:2023-04-14
  • 通讯作者: 陈楠 E-mail:1023869217@qq.com;chenn@bit.edu.cn
  • 作者简介:封迈(1998—),女,硕士研究生,研究方向为锂离子电池低温电解液,E-mail:1023869217@qq.com
  • 基金资助:
    山东省重点研发计划(2021CXGC010401);国家自然科学基金项目(52272185)

Research progress of low-temperature electrolyte for lithium-ion battery

Mai FENG1,2,3(), Nan CHEN1,2(), Renjie CHEN1,2   

  1. 1.Advanced Technology Research Institute of Beijing Institute of Technology, Ji'nan 250300, Shandong, China
    2.School of Materials, Beijing Institute of Technology, Beijing 100081, China
    3.School of Environment and Chemical Engineering, Heilongjiang University of Science and Technology, Harbin 150020, Heilongjiang, China
  • Received:2022-11-04 Revised:2022-12-07 Online:2023-03-05 Published:2023-04-14
  • Contact: Nan CHEN E-mail:1023869217@qq.com;chenn@bit.edu.cn

摘要:

锂离子电池在低温条件下运行时,电池的电化学性能已经不能达到最佳状态,存在容量迅速恶化的问题,这限制了其在极寒地区以及航空、国防军事等特殊领域的应用。因此,提高电池的低温性能成为研究热点之一。本文通过对相关文献的探讨,综述了改善锂离子电池低温性能的策略,着重介绍了电导率较高的新型锂盐、由低熔点和高介电常数组成的混合溶剂以及有助于形成稳定SEI膜的成膜添加剂对电池低温性能的影响,重点分析了上述因素对于锂离子电池低温性能的影响机制。综合分析表明,Li+的溶剂化结构与去溶剂化过程在电极界面上的行为直接决定了电池的低温性能。本文强调了从电解液的溶剂化结构入手来设计低温电解液的重要性,为未来低温锂离子电池开发提供了新思路。

关键词: 锂离子电池, 低温, 电解液, 锂盐, 溶剂, 添加剂

Abstract:

When lithium-ion battery operates at low temperature, their electrochemical performance cannot reach the optimal state, and their capacity deteriorates rapidly, which limits their application in extremely cold regions, aviation, national defense and military, and other fields. Therefore, improving the low-temperature performance of batteries has become an interesting field of research, and this study discusses the relevant strategies in the literature. The effects and mechanism of factors, including new lithium salts with high conductivity, mixed solvents with low melting point and high dielectric constant, and film-forming additives that facilitate stable solid electrolyte interface (SEI) films, on the low-temperature performance of lithium-ion batteries, are emphatically studied. The comprehensive analysis shows that the solvation structure of Li+ and the behavior of the desolvation at the electrode interface directly determine the low-temperature performance of the battery. The importance of designing low-temperature electrolytes using the solvation structure of electrolytes was emphasized. It provides a novel idea for developing low-temperature lithium-ion batteries in the future.

Key words: lithiumion battery, low temperature, electrolyte, lithium salt, solvent, additive

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