在Li4Ti5O12基细胞中的降解效应─从电极潜在配置文件中学习
Lennart Alsheimer1, Martin Winter1,2, Markus Börner1
1MEET Battery Research Center, University of Münster, Corrensstr. 46, 48149 Münster, Germany.
ACS applied materials & interfaces
|October 22, 2024
概括
酸 (Li4Ti5O12) 电池的电容因的损失和电解质消耗而减弱. 更高的形成温度和从水分和电解质分解中了解气体演变可以改善电池寿命.
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
- 储能 储能 储能 储能 储能 储能
背景情况:
- 酸 (Li4Ti5O12) 由于其稳定性和安全性,是高功率离子电池的关键材料.
- 在Li4Ti5O12细胞中的循环衰老和气体演化阻碍了优化设计和寿命.
- 了解这些衰老机制对于推进电池技术至关重要.
研究的目的:
- 研究LiNi1/3Co1/3Mn1/3O2 (NCM111) 细胞中的循环衰老行为和气体演变.
- 确定基于LTO的电池容量衰减和气体产生的主要原因.
- 探索减轻产能损失和改善周期寿命的策略.
主要方法:
- 在循环过程中使用了三电极设置来对NCM111RaddyRaddyLTO细胞进行操作分析.
- 在延长周期内监测电极电位配置和容量变化.
- 研究了形成温度对细胞性能和衰老的影响.
主要成果:
- 观察到初始容量增加,然后在40个周期后显著消失,与库存损失和电解质消耗有关.
- 证明较高的形成温度有效抑制容量下降,损失和电解质消耗.
- 确定LTO电极表面的水分和电解质的还原性分解是气体演变的主要来源.
结论:
- LTO电池的循环老化主要是由库存损失和电解质降解造成的,导致容量减弱.
- 优化形成温度是一种可行的策略,可以提高基于LTO的细胞的稳定性和寿命.
- 解决LTO电极上的水分和电解质分解对于解决气体演变问题以及提高电池安全性和性能至关重要.
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