摘要
三元正极材料低热稳定性及有害气体释放特性严重影响了锂离子电池的安全性能。针对三元正极材料性能失效、结构失效及安全稳定性之间的内在联系,通过原位电化学质谱和差示扫描量热分析探究老化失效(A-NCM)及原始(O-NCM)LiNi_(0.5)Co_(0.2)Mn_(0.3)O_(2)电极材料在两种状态下的安全稳定性。结果表明,在4.7 V充电截止电压测试条件下,A-NCM重组装的电池在电化学循环过程中产生了明显的CO_(2)和H_(2)有害气体。此外,当电极材料与电解液之间的热分解反应被引发后,A-NCM电极将释放更多的热量,从而进一步推高电池温度,造成安全隐患。该研究有助于构建“电池老化-电池安全”之间的映射关系,为电池安全智能管理提供理论基础。
The poor thermal stability and detrimental gas release characteristics of ternary cathode materials significantly affect the safety performance of lithium ion batteries.Aimed at exploring the intrinsic relationship between performance failure,structural failure,and safety stability of the ternary cathode,the in-situ electrochemical mass spectrometry and differential scanning calorimetry analyses were conducted on the aged(A-NCM)and fresh(O-NCM)LiNi_(0.5)Co_(0.2)Mn_(0.3)O_(2) cathodes to investigate their safety stability.The results show that,under an upper cutoff voltage of 4.7 V,significant CO_(2) and H_(2) harmful gas signals were detected for A-NCM during electrochemical cycling.Additionally,when the thermal decomposition reaction between the electrode and the electrolyte was initiated,A-NCM electrode would release more heat,further increasing the battery temperature and posing safety hazards.This research helps to construct the relationship between"battery aging and battery safety",providing a theoretical basis for intelligent battery safety management.
作者
张燕
张瑞强
初银晓
孟凡波
胥婷
孙晓
郭健
ZHANG Yan;ZHANG Ruiqiang;CHU Yinxiao;MENG Fanbo;XU Ting;SUN Xiao;GUO Jian(State Grid Shandong Electric Power Research Institute,Jinan Shandong 250002,China;Shandong Zhongshi Yitong Group Co.,Ltd.,Jinan Shandong 250002,China;Huadian Longkou Power Generation Co.,Ltd.,Yantai Shandong 265799,China;State Grid Shandong Comprehensive Energy Service Co.,Ltd.,Jinan Shandong 250013,China)
出处
《电源技术》
北大核心
2025年第9期1840-1845,共6页
Chinese Journal of Power Sources
关键词
锂离子电池
层状正极材料
热分解
结构失效
安全性能
lithium ion battery
layered cathode
thermal decomposition
structure failure
safety performance
