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在NCM622/石墨系统中研究离子电池材料的电热特性

Hao Li^1,2,3, Xv Wu^1,2,3, Sheng Fang^1,2

¹National Power Battery Innovation Center, China GRINM Group Corporation Limited, Beijing, China.

Frontiers in chemistry

|April 29, 2024

概括

离子电池中的热失控是一种安全风险. 早期的热量产生涉及负电极和电解质,随后是高温的正电极和电解质,影响电动汽车的安全性.

科学领域:

材料科学材料科学材料科学
电化学电化学电化学
电池安全工程电池安全工程

背景情况:

离子电池中的热失控对电动汽车构成重大安全隐患.
了解反应机制对于制定有效的预防策略至关重要.

研究的目的:

研究不同充电状态 (SOC) 的关键电池材料的热失控反应机制.
确定在热失控的早期和后期阶段产生热量的主要贡献者.

主要方法:

差分扫描热量计 (DSC) 用于分析阴极,阳极,分离器和电解质组件的热量产生.
对电池单体的加热实验将热特性与故障机制相关联.

主要成果:

阳极和电解质之间的反应主导了早期的热积累.
阴极-电解质反应在临界温度下触发,导致加速的热失控.
热量产生依赖于SOC,竞争反应影响行为.

结论:

阳极-电解质相互作用对于启动热失控至关重要.
了解特定材料的热量产生为早期预警和抑制策略提供了基础.
这项研究提供了关于提高离子动力电池安全性的见解.

关键词:

不同扫描热量计差异扫描热量计.电解质的电解质是一种电解质.离子电池是一种离子电池.充电状态充电状态热 runaway 失控的热失控的热失控的

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