基于不同激活度的富层氧化物阴极的囊细胞的热失控过程机制的比较研究
Wei Quan1,2, Jinghao Liu1,2, Jinhong Luo1,2
1China Automotive Battery Research Institute Co., Ltd No.11 Xingke Dong Street, Huairou District Beijing 101407 China quanwei@glabat.com.
RSC advances
|November 5, 2024
概括
富层氧化物 (LLO) 阴极的适度激活可以平衡高能量密度和电池安全性. 较高的激活度增加了由于易受伤害的接口和材料稳定性的削弱而导致的热失控风险.
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
- 电池技术 电池技术
背景情况:
- 富层氧化物 (LLO) 是下一代高能量密度电池的关键材料.
- 现有的LLO研究主要集中在电化学性能上,忽视了关键的安全方面.
- 电池电池中的热逃跑 (TR) 是一个严重的安全问题.
研究的目的:
- 系统地研究基于LLO的囊细胞中的热失控 (TR) 过程.
- 阐明不同激活度对LLO阴极材料和电池的热稳定性的影响.
- 建立一个实用的战略,以平衡LLO电池的能量密度和安全性.
主要方法:
- 采用了全面的热分析方法来研究TR过程.
- 调查的重点是阴极激活度与热稳定性之间的相关性.
- 分析包括固体电解质间相 (SEI) 和阴极材料稳定性的表征.
主要成果:
- 较高激活度的LLOs导致更脆弱的SEI层,在较低的温度下启动自热.
- 在更高的激活度下减弱的正极材料稳定性加剧了外热反应,降低了TR开始温度.
- 在不受控制的TR过程中增加氧气释放加剧了外热氧化还原反应.
结论:
- LLOs的激活程度极大地影响了电池的安全性和热稳定性.
- 过度激活会损害SEI层和阴极材料的完整性,增加TR风险.
- 建议对LLOs采用适度激活的策略,以实现高能量密度和细胞安全之间的平衡.
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