高电压技术2017，Vol.43Issue(7)：2221-2228,8.DOI:10.13336/j.1003-6520.hve.20170628017
高能量密度镍钴铝酸锂/钛酸锂电池体系的热稳定性研究
Thermal Stability of High Energy Density LiNi0.815Co0.15Al0.035O2 / Li4Ti5O12 Battery
摘要
Abstract
Recently,the safety issues of lithium ion batteries have received much attention.Consequently,we evaluated the thermal stability of main constructive materials for LiNi0.815Co0.15Al0.035O2/Li4Ti5O12 battery and the thermal safety of LiNi0.815Co0.15Al0.035O2/Li4Ti5O12 battery by using a C80 micro calorimeter and accelerating rate calorimetry (ARC),respectively.The experimental results show that the thermal runaway triggering temperature is 171 ℃,similar to the second endothermic peak of separator locating at 168.62 ℃.The activation energy of the Li4Ti5O12/electrolyte (75.43 kJ/mol) is lower than LiNi0.815Co0.15Al0.035O2/electrolyte,while the total heat generation of LiNi0.815Co0.15Al0.035O2/electrolyte (908.42 J/g) is much higher than Li4Ti5O12/electrolyte (284.63 J/g).Based on the investigation of C80 and ARC,thermal runaway at elevated temperatures for the LiNi0.815Co0.15Al0.035O2 / Li4Ti5O12 battery is summed up as follows:melting of separator will result in short circuit of positive-negative materials,Li4TisOi2-electrolyte reaction will lead to an accumulation of heat,further decomposition of LiNi0.815Co0.15Al0.035O2,and oxidation of decomposition products with electrolyte.The whole process takes only 45 seconds.关键词
镍钴铝酸锂/钛酸锂/热稳定性/热失控/ARC/C80微量量热仪Key words
LiNi0.815Co0.15Al0.035O2/Li4Ti5O12/thermal stability/thermal runaway/ARC/C80 micro calorimeter引用本文复制引用
张明杰,杨凯,段舒宁,刘皓,高飞,耿萌萌..高能量密度镍钴铝酸锂/钛酸锂电池体系的热稳定性研究[J].高电压技术,2017,43(7):2221-2228,8.基金项目
国家电网公司科技项目(DG71-16-015).Project supported by Science and Technology Project of SGCC (DG71-16-015). （DG71-16-015）
