由于硫化物基固体电解质的机械降解,加速了的透和裂纹的传播
Megan Diaz1, Zakariya Mohayman1, Imtiaz Shozib2
1Department of Materials Science and Engineering, University of Central Florida, Orlando, FL, 32816, USA.
Small methods
|May 2, 2024
概括
在固体电解质中树脂的生长会导致裂. 在循环过程中,Li$_{6}$PS$_{5}$Cl (LPSCl) 固体电解质的机械降解降低了其强度,使得在较低的力下能够产生树驱动的裂.
科学领域:
- 固态电化学 固态电化学
- 材料科学 是一种材料科学.
- 机械工程 机械工程
背景情况:
- 树的生长是固态电池安全性和性能的一个主要挑战.
- 了解树生长,机械故障和固体电解质特性之间的相互作用至关重要.
研究的目的:
- 量化研究树的生长,在Li$_{6}$PS$_{5}$Cl (LPSCl) 固体电解质 (SE) 中的裂核化/扩散和驱动力学力量之间的关系.
- 阐明循环过程中LPSCl机械降解背后的机制.
主要方法:
- 外置扫描电子显微镜 (SEM) 用于观察树的生长模式.
- 在现场传输电子显微镜 (TEM) 用于分析裂核和传播.
- 密度函数理论 (DFT) 模拟来研究晶体结构障碍和机械强度减弱.
主要成果:
- 确定了两种树生长模式:在SE孔内纵向裂变和沿粒子边界横向透.
- 观察到,在纳米尺寸的缺陷中涂层会在压力低于预期的压力下触发裂核和传播.
- DFT模拟显示,电化学循环诱导LPSCl中的障碍,降低其机械强度.
结论:
- 在循环过程中LPSCl的机械降解显著降低了裂纹启动的值力.
- 这种降解机制对于理解和减轻固态电池中树石诱导的故障至关重要.
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