钠离子电池初始库仑效率研究进展  

Research progress of initial coulomb efficiency of sodium ion battery

作　　者：董春伟 孔俊丽 苏志江 梁文斌 DONG Chunwei;KONG Junli;SU Zhijiang;LIANG Wenbin(National Institute of Clean-and-Low-Carbon Energy(NICE),Beijing 102211,China)

机构地区：[1]北京低碳清洁能源研究院,北京102211

出　　处：《电源技术》2024年第9期1676-1684,共9页Chinese Journal of Power Sources

摘　　要：锂离子电池主导了便携式电子产品和电动汽车市场、储能市场,锂的成本和资源可用性也越来越受到关注。钠离子电池被认为是电网级能量存储系统的理想选择。然而,在钠离子电池实现商业化应用之前,仍有各种挑战需要克服,其中,初始库仑效率低是制约钠离子全电池实际能量密度提升的关键问题。分析了钠离子电池低初始库仑效率的影响因素,包括在初始循环过程中因电解液分解形成的固体电解液界面膜、较差的钠离子嵌入/脱出可逆性、缺陷和表面官能团影响等。总结了结构/形貌设计、表面改性、电解液优化等提高钠离子电池初始库仑效率的策略,对于推动与实现高能量密度钠离子电池的实际应用具有重要意义。Lithium ion battery dominates the market of portable electronic products and electric vehicles and energy storage.However,more and more attention has recently been paid to the cost and resource availability of lithium.Sodium ion batteries are considered to be the ideal choice for gridlevel energy storage systems.There are still various challenges need to be overcome,however,before its commercial application.Among them,the low initial coulombic efficiency is a critical issue that seriously limits the improvement of practical energy density of the sodium ion full battery.This review analyzed the influence factors of low initial coulomb efficiency,such as the solid electrolyte interphase formed due to the decomposition of electrolyte during the first cycle,and the poor reversibility of sodium ion insertion/deintercalation process,as well as the defects and surface functional groups.Also,the paper summarized the emerging strategies to improve the initial coulomb efficiency of sodium ion batteries,such as electrolyte optimization,structure/morphology design,surface modification,and binder optimization,which is of great significance for promoting and realizing the practical application of high energy sodium ion batteries.

关 键 词：钠离子电池 负极 初始库仑效率 改性策略 

分 类 号：TM912[电气工程—电力电子与电力传动]