通过形成稳定和高导电性的固体电解质接口和银合金,协同稳定薄金属
Jungmin Kim1, Isheunesu Phiri1, Sun-Yul Ryou1
1Department of Chemical and Biological Engineering, Hanbat National University, Daejeon 34158, Republic of Korea.
ACS applied materials & interfaces
|September 28, 2023
概括
研究人员在金属上开发了一种银- (Ag-Li) 合金涂层,以抑制树的生长. 这种Ag-Li合金和稳定的固体电解质接口 (SEI) 显著提高了电池循环寿命和效率.
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
- 电池技术 电池技术
背景情况:
- 金属电池 (LMB) 对高能量密度存储具有前景.
- 金属阳极上的石形成是一个主要的安全性和性能问题.
- 稳定的固体电解质接口 (SEI) 对于高效的离子运输至关重要.
研究的目的:
- 开发一种用于在金属上制造稳定的SEI和Ag-Li合金的新方法.
- 研究Ag-Li合金和SEI对沉积和树抑制的影响.
- 为了评估LMBs中改性金属阳极的电化学性能.
主要方法:
- 在Li金属表面上涂上银 (Ag) 纳米粒子和酸 (LiNO3) 的泥涂层,形成AgLN涂层的Li.
- Ag-Li合金的特性和SEI特性,包括Li扩散系数.
- 在电池配置中对AgLN涂层的阳极进行电化学测试.
主要成果:
- 形成稳定的SEI和具有高Li扩散系数的高导电性Ag-Li合金.
- 证明了原子的向内转移和合金下方的沉积,抑制了树岩的形成.
- 在2.3 mA h cm−2.2的500个循环中,达到的初始容量保持率>81%和库伦比效率 (CE) >99.7 ± 0.2%.
结论:
- AgLN涂层通过形成有益的Ag-Li合金和SEI.有效地稳定了金属阳极.
- 改进的离子扩散和抑制的树突导致电池循环寿命和效率的提高.
- 这种方法为开发更安全,更耐用的金属电池提供了一个有前途的战略.
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