锂离子电池中的热效应

Thermal Behavior Inside Lithium-ion Batteries

利用C80微量量热仪测试了锂离子电池内部主要产热过程。分析了电池内部有机电解液的热分解、正负极的热分解及其与电解液的反应热特性。结果表明,嵌锂碳与电解液甚至在40℃就有反应,脱锂L i0.5CoO2与电解液在132℃开始反应放热。当电池温度超过72℃时,开始发生放热反应,总放热量为1 036.7 J/g。

In order to study the thermal behavior in lithium-ion battery, the main heat generation process in the battery was studied by means of a C80 calorimeter. The main heat output processes including the thermal decomposition of electrolyte and electrodes, the reactions between electrolyte and electrodes, were analysed in this paper. The results show that the lithiated carbon reacted with electrolyte even at 40 ℃, and delithiated Li0.5CoO2 reacted with electrolyte at 132 ℃ with heat generation. In normal usage, the heat is mainly contributed by the impedance. When the temperature is over 72 ℃, exothermic reaction occurs inside the battery, with heat generation of 1 036. 7 J/g.