锂离子电池不锈钢壳体与电解液的腐蚀性研究  

Research on corrosion of stainless steel can and electrolyte in lithium-ion battery

作　　者：常海涛[1] CHANG Haitao(Fujian Nanping Nanfu Battery Co.,Ltd.,Nanping,Fujian Province,353000,China)

机构地区：[1]福建南平南孚电池有限公司,福建南平353000

出　　处：《电池工业》2023年第6期280-284,294,共6页Chinese Battery Industry

摘　　要：不锈钢壳体与电解液的适配性问题是众多锂离子电池生产厂家重点关注的问题之一,该问题的解决能有效提高电池的储存性能和安全性能。通常用制备全电池的方式来研究壳体腐蚀情况,然而该方法耗时长,不利于快速开发验证。本研究通过制备半电池模拟全电池高温存储情况,利用计时电流法、光学显微镜、场发射电镜(SEM)等方式,研究了304和316L不锈钢壳体在电解液中的腐蚀情况。结果表明,316L不锈钢壳体在双氟磺酰亚胺锂(LiFSI)电解液体系中具有更好的耐腐蚀能力。通过相同不锈钢材质、相同电解液的全电池实验进行了验证,得到了同样的结果,这对于电池的开发具有指导意义。本文作者同时提出了一种能有效判断不锈钢壳体在电解液体系中腐蚀情况的方法,为快速验证不锈钢壳体与电解液的适配性问题提供了理论依据。The compatibility between stainless steel can and electrolytes is one of the key concerns of many lithium-ion battery manufacturers.The solution to this problem can effectively improve the storage performance and safety performance of the battery.The corrosion of the can is usually studied by preparing a full battery.However,it takes long time and is not conducive to rapid development and verification.In this paper,the corrosion of 304 and 316L stainless steel can in electrolyte was studied by using chronoamperometry,optical microscope,SEM and other methods through the preparation of half-cell to simulate the high temperature storage of the full battery.The result shows that 316L stainless steel can has better corrosion resistance in LiFSI electrolyte system.Furthermore,the same results were obtained through full cell experiments with the same stainless steel material and electrolyte,which has guiding significance for the development of batteries.At the same time,a method was proposed to determine the corrosion of stainless steel can in the electrolyte system effectively,which provided a theoretical basis for quickly verifying the compatibility between the electrolyte and stainless steel can.

关 键 词：计时电流法 不锈钢 电解液 锂离子电池 腐蚀 

分 类 号：TQ152[化学工程—电化学工业]