一种在循环过程中追踪电池厚度变化的原位测试方法

An Operando Method for Thickness Tracking of Lithium Ion Battery During Cycling

电池内部组分的体积变化是造成电池失效的原因之一,电极片的原材料和制造工艺均会影响电极在充放电过程中的体积变化,保持体积的相对恒定对于实现电池优异的循环性能和可靠的安全性是必要的。不同电池组成在不同循环条件下的厚度变化可以作为定性和定量的考察因子。本文主要介绍了一种简单的可在循环过程中实时追踪电池厚度变化的原位测试方法及其装置原理,并对其应用进行展望,可为材料研发和电池研发的工程师提供参考。

The volume change of components is one of the failure causes of battery.The materials and manufacturing process of electrode affect its volume change.Keeping the volume relatively constant during cycling is necessary to achieve excellent cycle performance and reliable safety for battery.The thickness variation of batteries with different compositions under various cycle conditions can be used as a qualitative and quantitative factor for performance evaluation.This paper introduces a simple operando method and its principle for thickness tracking of battery during cycling,and prospects its application,which can provide an effective tool for engineers in the field of material and battery development.