微量双盐电解质添加剂,为高性能金属电池提供富含LiF的固体电解质间相
Yingchun Xia1,2, Wenhui Hou1, Pan Zhou1
1Department of Chemical Engineering, Tsinghua University, Beijing 100084, China.
Nano letters
|October 7, 2024
概括
一种新型的微量双盐电解质添加剂 (TDEA) 通过促进富含化的固体电解质交相 (SEI) 来提高金属电池的性能. 这提高了高能量密度应用的循环稳定性和寿命.
科学领域:
- 电化学 电化学 电化学
- 材料科学 材料科学 材料科学
- 储能 储能 储能 储能 储能 储能
背景情况:
- 固体电解质介相 (SEI) 组成和特性对于金属电池的循环性至关重要.
- 现有的金属阳极面临着树突形成和有限的循环稳定性方面的挑战.
研究的目的:
- 开发一种新的电解质添加剂,用于改善金属电池中的SEI层.
- 为了提高电化学性能,循环稳定性和金属阳极的能量密度.
主要方法:
- 在电解质中引入微量双盐电解质添加剂 (TDEA).
- 分析SEI的组成和形态,重点关注化 (LiF) 的分布.
- 用基于TDEA的电解质对金属阳极和LiNCM811全电池进行电化学测试.
- 在严格的循环条件下评估袋式电池性能.
主要成果:
- TDEA加速了LiF的产生,并促进了较早的LiF沉,在阳极上形成了富含LiF的SEI.
- TDEA抑制了树的形成,改变了沉积的形态,并增加了循环时间和电流密度.
- 与没有添加剂的细胞相比,使用TDEA的LiNCM811全细胞的寿命翻了一番.
- 支持TDEA的电解质在500mAh袋式电池中实现了347Wh kg-1的高能量密度,在180多个周期中稳定循环.
结论:
- 微量双盐电解质添加剂 (TDEA) 策略有效地改善了SEI层,提高了金属电池的性能.
- TDEA为开发高性能,稳定和高能量密度的金属电池提供了一个有前途的方法.
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