锂离子电池中金属及金属氧化物引发自放电的研究

Study on Self-discharge Induced by Metal and Metal Oxide in Lithium Ion Battery

组装以Cu O或ZnO为工作电极的扣式电池,采用循环伏安法和X射线衍射技术考察锂离子电池中金属及氧化物或作为杂质的电化学行为,研究其引发电池自放电的机理。结果表明:Cu O、ZnO在正极高电位下未参与电极间的电化学反应,是可以稳定存在;但在负极则会发生还原反应生成金属单质,这是自放电电池隔膜黑点负极侧金属的主要来源之一。

Button batteries with CuO or Zn O as working electrode were assembled. The mechanism of self-discharge induced by metal oxide impurities in Li ion battery was studied by cyclic voltammetry and XRD methods. The results show that Cu O and Zn O impurities can exist stably at high potential of the positive electrode, but the reduction reaction will occur at the negative electrode to form metal elements, which is one of the main sources of metal on the negative side of the separator black spot of self-discharge battery.