层状锰酸锂/碳电化学体系的热稳定性模拟

Thermal stability simulations on layered lithium manganese oxide/carbon electrochemical system

通过对满电态层状锰酸锂材料、全放电态碳材料及电解液的热性质分析和拟合,建立了层状锰酸锂/碳电化学体系的热模拟模型,并对该体系的热稳定性进行了模拟研究。通过研究该电池从缓慢自放热到热失控的整个过程发现,满电态的层状锰酸锂材料和全放电态碳材料都有两个放热反应过程;负极碳材料在120℃左右的放热峰是造成电池自加热的初始原因,而层状锰酸锂和碳材料300℃左右的放热峰是造成该电池体系热失控的主要原因。该研究对层状锰酸锂/碳电池体系的安全设计与评估提供了理论支持。

The thermal model of layered lithium manganese oxide/carbon electrochemical system was developed,based on the thermal characterized and calculated of full charged layered lithium manganese oxide and full discharged carbon materials.The simulations on thermal stability of lithium manganese oxide/carbon electrochemical system show that:both full charged lithium manganese oxide and full discharged carbon present two exothermic processes;and the first exothermic reaction of carbon material should answer for the initially self-heating of lithium manganese oxide/carbon electrochemical system,while the second reactions of layered lithium manganese oxide and carbon cause the lithium manganese oxide/carbon cell going into thermal runway.