摘要
通过测试几种LiNixCoyMnzO2(NCM)材料的热性质并拟合其热反应参数,建立了不同NCM/C电池的热模型。通过模拟的手段对该体系的热稳定性进行了对比研究,结果表明,NCM材料的热稳定性随着其Ni含量的增加而降低,同时其电池的热失控温度降低。分析电池的热失控机理发现,NCM/C电池热失控的主要原因是NCM材料的热分解放热反应,NCM的热稳定性下降导致其在更低的温度下发生分解,因此降低了电池的热稳定性。该研究结果对NCM电池的安全性评估与设计具有指导意义。
Thermal models of several kinds of LiNixCoyMnzO2/C cell were constructed by characterizing thermal properties of different LiNixCoyMnzO2(NCM) materials.Comparison study of thermal stability of NCM/C cells was conducted by thermal simulation,which reveals that thermal stability of NCM materials as well as thermal runaway temperature of NCM/C cells decreases with the increase of Ni content.Thermal runaway mechanism was investigated,which shows that thermal runaway of NCM/C cells was triggered by thermal decomposition of NCM cathode.The NCM material with inferior thermal stability would decompose under lower temperature,and it resulted in the decrease of thermal stability of NCM/C cell.
作者
宁凡雨
王松蕊
刘兴江
NING Fan-yu;WANG Song-rui;LIU Xing-jiang(National Key Laboratory of Power Sources,Tianjin Institute of Power Sources,Tianjin 300384,China)
出处
《电源技术》
CAS
北大核心
2020年第7期937-941,共5页
Chinese Journal of Power Sources
基金
国家重点研发计划(2018YFB0105900)。
关键词
NCM电池
热稳定性
热失控
模拟
NCM cells
thermal stability
thermal runaway
simulation
