通过预化三酸作为硫化物基础全固态金属电池中的有机添加剂进行界面稳定
Leonie Braks1, Jinsong Zhang2, Alexander Forster1
1Department of Chemistry, University of Fribourg, Chemin de Musee 9, Fribourg, 1700.
Angewandte Chemie (International ed. in English)
|June 11, 2024
概括
在硫化物固体电解质中添加预化三酸 (Li3TCA),可以稳定与金属阳极 (LMA) 的接口. 这种有机添加剂方法提高了全固态电池的临界电流密度和循环稳定性.
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
- 储能 储能 储能 储能 储能 储能
背景情况:
- 基于硫化物的全固态电池 (ASSB) 与金属阳极 (LMA) 提供比离子电池更高的能量密度和安全性.
- 由于狭窄的电化学稳定性和反应性,硫化物固体电解质和LMA之间的界面不稳定性阻碍了ASSB的性能.
- 开发稳定的固体电解质介面相对于推进ASSB技术至关重要.
研究的目的:
- 研究一种有机添加剂方法来稳定LMA/硫化物固体电解质接口.
- 提高ASSB的电化学性能和循环稳定性.
- 为了减轻硫化物基ASSB的界面降解问题.
主要方法:
- 在Li6PS5Cl硫化物固体电解质中加入预化三酸 (Li3TCA) 作为有机添加剂.
- 制造和电化学测试LiadoseLi对称电池和LiadoseNbO-NCM811全电池.
- 分析固体电解质介相 (SEI) 组成和形态.
主要成果:
- 添加2.5%重量的Li3TCA通过降低SEI中的Li2S含量,显著改善了接口稳定性.
- 的对称电池中的临界电流密度从1.0增加到1.9mA cm-2.
- 在对称细胞中,在1.0 mA cm-2下稳定循环超过750小时,在完整细胞中,在0.3 C下达到500多个循环.
结论:
- 3TCA有机添加剂有效地稳定了LMA/硫化物固体电解质接口,提高了ASSB的性能.
- 这一战略为克服高能量密度固态电池的接口挑战提供了一个有希望的途径.
- 开发的方法有助于推进更安全,更有效的储能解决方案.
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