离子定制EDL诱导三层SEI在高容量阳极上,可实现快速充电和持久的存储
Jun Luo1, Kaiwei Yang1, Jingjing Gai1
1College of Chemistry, Zhengzhou University, Zhengzhou, 450001, P. R. China.
Angewandte Chemie (International ed. in English)
|November 11, 2024
概括
添加剂在高容量阳极上创建了一个新的三层固体电解质介相 (SEI),增强循环稳定性和快速储存. 这一突破改善了电池的性能和寿命.
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:
- 高容量电极由于粒子碎片化和连续固体电解质间相 (SEI) 形成而遭受不良循环稳定性.
- 开发稳定的SEI层对于电池中高效且持久的储存至关重要.
研究的目的:
- 引入一种自我调节的电解质添加剂,以改善高容量阳极上的SEI形成.
- 通过设计一种新的三层SEI结构,实现稳定和快速的储存.
主要方法:
- 使用 (Se) 作为可溶性电解质添加剂来调节电双层 (EDL).
- 研究了Sex2-的现场生成和优先吸附到阳极的EDL.
- 分析了由此产生的三层SEI (Se/无机/有机) 的组成和结构.
主要成果:
- 一个独特的三层SEI (内部:Se;介质:无机;外部:有机) 在FeS2阳极上成功构建.
- 由Se引起的SEI显著降低了电解质分解和气体演变.
- FeS2阳极表现出异常的循环稳定性,在6000个循环后在10 A g-1下保持93.1%的容量.
结论:
- 对离子量身定制的EDL方法提供了一个新的SEI模型,用于在高容量阳极中稳定储存.
- 添加剂为开发用于快速充电应用的先进电池材料提供了一个有前途的战略.
- 三层SEI形成机制适用于其他高容量阳极,如SnS.
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