在全固态电池中,具有Ag替代的化,化和硫化电解质为卓越的界面稳定性提供了优越的界面稳定性
Hyunsuk Noh1, Yong-Jin Jang1, Sanghyeok Bae1
1School of Materials Science and Engineering, Kookmin University, Seoul 02707, Republic of Korea.
ACS applied materials & interfaces
|October 13, 2025
概括
化 argyrodite固体电解质中的银替代增强了所有固态电池的界面稳定性. 这种改进可以实现稳定的涂层和剥离,为实际的电池应用铺平了道路.
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
- 固态化学 固态化学
背景情况:
- 硫化物固体电解质对全固态电池 (ASSB) 是有前途的,因为其高离子导电性和机械强度.
- 固体电解质和金属之间的界面稳定性较差,阻碍了ASSB的实际应用.
- 与化物替代品相比,化物 (BH4-) 基 argyrodite 电解质表现出优越的离子导电性,使它们成为有吸引力的候选者.
研究的目的:
- 合成基于化的新型化固体电解质,具有增强的界面特性.
- 研究银 (Ag) 替代对这些电解质的结构和电化学性能的影响.
- 评估使用开发的电解质的全固态电池的稳定性和性能.
主要方法:
- 两步球磨工艺用于合成BH4基 argyrodite电解质,无需热处理.
- 在 argyrodite 结构中的 (Li) 位点部分替代银 (Ag).
- 电化学表征包括离子导电量测量和Li对称细胞循环.
- 用于界面分析的X射线光电子光谱 (XPS).
主要成果:
- 一种新型化合物Li5.5Ag0.1PS4.6(BH4)1.4,在30°C时达到13.7mS cm-1的高离子导电性.
- 对称细胞表现出稳定的长期涂/剥离周期,临界电流密度高,为2.9 mA cm-2.
- XPS分析显示,在Li/固体电解质接口上形成了Li-Ag合金,抑制了树突的生长并增强了稳定性.
结论:
- 在以BH4为基础的 argyrodite固体电解质中替代银显著改善了与金属的界面稳定性.
- 合成的Li5.5Ag0.1PS4.6(BH4) 1.4电解质表现出卓越的电化学性能,包括高离子导电性和稳定的循环.
- 这些发现凸显了Ag替代BH4- argyrodites在开发实用和高性能全固态电池方面的潜力.
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