控制两个固体电解质介面在基于阿吉罗石电解质的无阳极全固态电池的负电极上
Yixian Wang1, Vikalp Raj1, Kaustubh G Naik2
1Materials Science and Engineering Program, Walker Department of Mechanical Engineering and Texas Materials Institute, The University of Texas at Austin, Austin, TX, 78712, USA.
Advanced materials (Deerfield Beach, Fla.)
|January 7, 2025
概括
所有无阳极固态电池都使用Mg/W-Cu双层来稳定接口,实现高性能和周期寿命. 这种设计可以防止降解,并实现稳定的金属循环.
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:
- 所有无阳极固态电池 (AF-ASSB) 面临着独特的挑战,因为活性接口会影响稳定性.
- 6PS5Cl (LPSCl) 固体电解质 (SE) 在铜电流采集器上形成有害的SEI-2层.
- 控制这些接口对于AF-ASSB的性能至关重要.
研究的目的:
- 调查所有无阳极固态电池的接口控制策略.
- 为了提高AF-ASSBs的电化学稳定性和性能.
- 了解电池退化过程中电流收集器间层的作用.
主要方法:
- 在一个铜电流采集器上制造一个Mg/W-Cu双层.
- 半细胞和全细胞配置的AF-ASSB的电化学测试.
- 材料表征和中尺度建模以阐明接口机制.
主要成果:
- /二层有效地控制了AF-ASSB中的三个关键接口.
- 使用NMC811阴极的AF-ASSB实现了150个周期,高达99.8%的库伦比效率.
- 在0.2C的45个循环后,高质量载荷阴极保持了86.5%的容量.
- 在沉积过程中形成的梯度Li-Mg固体溶液,增强了SEI-1的稳定性.
- 一个惰性W底层防止了SEI-2的形成,这对于防止降解至关重要.
结论:
- 两层Mg/W-Cu是稳定AF-ASSB接口的一个非常有效的策略.
- 这种方法可以实现最先进的电化学性能,即使使用高质量载荷阴极.
- 了解和控制接口现象是推进固态电池技术的关键.
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