化物作为复合式阴极中的催化物,以提高全固态硫电池的循环稳定性
Xiaorong Fang1, Yujun Fu1, Shiqing Sun1
1School of Materials and Energy, Lanzhou University,Lanzhou 730000, China.
Nano letters
|February 28, 2025
概括
一种新的Li3YCl5I阴解质通过提供更宽的电化学窗口和更好的离子导电性来增强全固态硫电池 (ASSLSB). 与传统材料相比,这导致容量保留和循环寿命显著改善.
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:
- 全固态硫电池 (ASSLSBs) 与液体电解质对应物相比,提供了更好的能量密度和安全性.
- 在ASSLSB中,硫化物基的催解体遭受狭窄的电化学窗口和分解,导致高的界面电阻和缩短的循环寿命.
- 在传统的硫电池中,聚硫化物穿效应仍然是一个挑战.
研究的目的:
- 为ASSLSBs中的复合性阴极开发具有广泛电化学窗口的稳定阴解质.
- 为了克服现有的硫化物催解体的局限性,例如分解和界面电阻.
- 提高ASSLSB的电化学性能和循环寿命.
主要方法:
- 一种新型Li3YCl5I阴解质的合成和表征.
- 在复合性阴极中使用Li3YCl5I阴解质制造ASSLSB.
- 电化学性能评估,包括在45°C下进行排放特定容量和循环寿命测试.
主要成果:
- 3YCl5I具有广泛的电化学稳定性窗口和高离子导电性 (1.67 × 10^-3 S cm^-1).
- 使用Li3YCl5I阴解质的ASSLSB实现了1084.05 mAh的高排放特异容量.
- 该电池表现出极好的循环稳定性,在100个循环后保持81.5%的容量,超过Li6PS5Cl (54.5%的保留率).
结论:
- 3YCl5I是开发高性能ASSLSB的有前途的催解物质.
- 开发的阴解质有效地减轻了接口电阻,并提高了电池的寿命.
- 这一进步有助于克服固态电池技术的关键挑战.
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