NCM811/SiC@石墨锂离子电池硅负极热稳定性能的研究  

Thermal stability of silicon-based anode in NCM811/SiC@graphite lithium-ion battery

作　　者：冀亚娟 官群 谢英朋 赵瑞瑞 JI Yajuan;GUAN Qun;XIE Yingpeng;ZHAO Ruirui(EVE Energy Co.,Ltd.,Huizhou Guangdong 516006,China)

机构地区：[1]惠州亿纬锂能股份有限公司,广东惠州516006

出　　处：《电源技术》2025年第2期323-330,共8页Chinese Journal of Power Sources

摘　　要：针对NCM811/SiC@石墨锂离子电池体系,采用差示扫描量热-热重分析(DSC-TG)方法,研究了满电态下电池各组件的释热时序及释热量,观察到满电态硅负极与电解液共存时的释热温度最低,即为第一热触发组件,而满电态正极、负极与电解液发生释热反应的释热量最大。设计了不同荷电状态(SOC)下,负极、负极+电解液、负极+正极以及负极+正极+电解液的热反应实验,发现空电态下的正极+负极+电解液依然存在释热反应,不能完全杜绝热失控。此外,还研究了满电态硅负极与单一溶剂电解液高温存储产气特性,发现氟代碳酸乙烯酯(FEC)基电解液与满电硅负极高温存储后的产气率最大,推测FEC基电解液对满电硅负极的热稳定性最差。The heat release sequence and heat contribution of each component in the fully charged NCM811/SiC@graphite lithium-ion battery system were studied by DSC-TG method.The thermal reaction temperature is the lowest when the fully charged silicon-based anode coexists with the electrolyte,namely the first thermal trigger component,and the quantity of heat release of the fully charged cathode and anode and electrolyte is the largest.The thermal reaction experiments of the anode,anode+electrolyte,anode+cathode and anode+cathode+electrolyte under different SOC were designed.It's found that there is still heat release reaction of the anode+cathode+electrolyte under the uncharged state,signifying that the thermal runaway of battery can not be completely eliminated.In addition,the characteristics of gas production of the fully charged silicon-base anode mixing with single solvent electrolyte were studied after high temperature storage.The gas production rate of the FECbased electrolyte in coexistence with the fully charged silicon-based anode is the highest after high temperature storage.It is speculated that the FEC-based electrolyte may have the worst thermal stability to the fully charged silicon-base anode.

关 键 词：锂离子电池 硅基负极 热稳定性 热量贡献 

分 类 号：TM912.9[电气工程—电力电子与电力传动]