石榴石固态电解质的超性转变为超性
Wei Luo1, Yunhui Gong1, Yizhou Zhu1
1Department of Materials Science and Engineering, ‡Department of Mechanical Engineering, and §University of Maryland Energy Research Center, University of Maryland , College Park, Maryland 20742, United States.
Journal of the American Chemical Society
|August 30, 2016
概括
研究人员通过将石榴电解质涂上来提高固态电池的安全性. 这种涂层增强了金属的接触,降低了接口电阻,提高了电池的稳定性,从而实现更安全,更高性能的能量存储.
科学领域:
- 材料科学
- 电化学
- 能量储存
背景情况:
- 与传统的离子电池相比,全固态电池 (ASSLB) 的安全性和稳定性更高.
- 固态电解质 (SSEs) 防止树突的形成,并允许使用金属阳极,但与的接口接触较差.
- 金属/SSE接口的高界面电阻和极化阻碍了ASSLB的性能.
研究的目的:
- 改进金属和石榴石基固态电解质之间的界面特性.
- 研究无形涂层对石榴石SSE的可湿性和电化学性能的影响.
- 展示一种提高ASSLB金属阳极稳定性的方法.
主要方法:
- 使用等离子增强化学蒸汽沉积 (PECVD) 对石榴石SSE进行无形 (a-Si) 涂层.
- 使用裸体和Si涂层石榴石SSE的金属对称电池的电化学表征.
- 对界面阻力和循环稳定性的分析.
主要成果:
- a-Si涂层将石榴石表面从"超"转变为"超",这是由于在现场形成的.
- 金属和石榴石SSE之间的表面电阻从925到127 Ω厘米大幅下降.
- 在涂层/剥离周期中,涂层石榴石SSE的稳定性显著提高.
结论:
- 可切换的-表面修饰是增强金属/SSE接口的可行策略.
- 石榴石SSE上的涂层有效地抑制了界面极化,并提高了循环稳定性.
- 这种方法有望开发下一代高性能和安全的全固态电池.
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