采用三电极的方法分别通过分析锂离子电池正负极的电位变化来研究电池的自放电。锂离子电池存储过程中的自放电的影响因素主要有:存储温度和存储时电池的充电状态,温度越低,电池的充电状态越低(但电压范围有限制:3.8⁴.2V)自放电越小。电池充放电过程中的自放电主要是由两部分组成,一是电池内部的副反应;二是内部微短路。内部微短路是由极片表面的颗粒及阴极极片边缘的金属毛刺所引起的电池内部微短路造成的。减小这些影响因素,可以降低电池的自放电。

In this article,the self-discharge of Li-ion battery is studied with tri-electrode cell by analysizing the voltage change of cathode and anode respectively.In the course of storage,selfdischarge of Li-ion battery is effected by temperature and SOC(state of charge).Low temperature and low SOC(voltage limit:3.8⁴.2V)will lead low self-discharge of Li-ion battery.The self-discharge in charge and discharge comes from the reactions in cell and the micro short circuit.The micro short is caused by the particles on the surface of electrode and the metallic burrs on the edge of cathode electrode.Eliminating this effects can reduce the self-discharge of Li-ion battery.