Precise in-situ and ex-situ study on thermal behavior of LiNi_(1/3)Co_(1/3)Mn_(1/3)O_(2)/graphite coin cell:From part to the whole cell  

作　　者：Chen Liang Lihua Jiang Shuliang Ye Zhaoyu Wang Zesen Wei Qingsong Wang Jinhua Sun 

机构地区：[1]State Key Laboratory of Fire Science,University of Science and Technology of China,Hefei 230026,Anhui,China [2]Institute of Industry and Trade Measurement Technology,China Jiliang University,Hangzhou 310018,Zhejiang,China

出　　处：《Journal of Energy Chemistry》2021年第3期332-341,共10页能源化学（英文版）

基　　金：supported by the National Natural Science Foundation of China(No.51976209);the Fundamental Research Funds for the Central Universities(No.WK2320000040);supported by Youth Innovation Promotion Association CAS(No.Y201768)。

摘　　要：Multiple mode calorimetry and C80 micro-calorimeter are used to investigate the impact of cathode and anode on heat generation of lithium ion battery.The thermal behaviors of LiNi_(x)Co_(y)Mn_(z)O_(2)/graphite full cell are discussed under normal operating and elevating temperature.Affected by negative entropy change,lithium intercalation presents more exotherms than deintercalation for both electrode materials.The contributions of irreversible and reversible heat to the total heat generation of graphite are evaluated.The phase transitions correlated with voltages and lithium contents are determined.Based on the analysis of half-cell,the effect of two electrodes(with the same capacity)on overall heat generation is nearly the same and anode of full cell plays a key role in charging while cathode dominates in discharging.Thermal behaviors of lithiated graphite and delithiated LiNi_(x)Co_(y)Mn_(z)O_(2) electrolyte and their coexisting system are identified to further explore their influence on battery safety.The breakdown of solid electrolyte interface(SEI)at around 82℃ is considered as a crucial factor affecting the thermal stability of full cell.The oxidation of electrolyte induced by oxygen released from cathode material turns out to be one of the main heat sources.These accurate results are of great significance to improve the existing thermal management system and provide basic data for the prediction of battery performance.

关 键 词：Lithium ion battery safety Heat generation Micro-calorimetry Electrode materials 

分 类 号：TQ131.11[化学工程—无机化工] TM912[电气工程—电力电子与电力传动]