将硫化集成为稳定的全固态硫电池的单个离子导体介面
Xin Wu1, Hui Pan1, Menghang Zhang1
1Center of Energy Storage Materials & Technology, Department of Energy Science and Engineering, College of Engineering and Applied Sciences, Jiangsu Key Laboratory of Artificial Functional Materials, National Laboratory of Solid State Microstructures, and Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing, 210093, P. R. China.
Advanced science (Weinheim, Baden-Wurttemberg, Germany)
|April 24, 2024
概括
一个新的Li2S介相层有效地稳定了Li10GeP2S12固体电解质对Li金属阳极. 这一突破使所有固态硫电池能够稳定运行,即使在高温下也是如此.
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
- 固态电池 固态电池是什么
背景情况:
- 10硫化 (LGPS) 是一种具有高离子导电性的有前途的固态电解质.
- 由于与金属阳极不相容,LGPS患有自我分解和树问题.
- 接口不稳定性阻碍了LGPS在固态电池中的实际应用.
研究的目的:
- 开发LGPS和金属阳极之间的稳定接口.
- 为了提高全固态硫电池 (ASSLSB) 的循环寿命和性能.
- 调查Li2S人工固体电解质介相 (SEI) 的作用.
主要方法:
- 简单的化学蒸汽沉积 (CVD) 方法在LGPS上创建Li2S SEI.
- 电化学表征,包括涂/剥离试验.
- 使用修改接口的ASSLSB的性能评估.
主要成果:
- 2S SEI 层表现出优异的离子导电性和电子绝缘.
- 在500多小时内实现了稳定的涂/脱落,证明了接口兼容性.
- 具有Li2S层的ASSLSB在0.2 mA cm-2.2的100个周期后显示了90.8%的容量保留.
- 在100个循环后在90°C观察到高可逆容量 (1318.8 mAh g-1) 与88.6%的保留率.
结论:
- 2S人工SEI有效地抑制了自我分解和树的生长.
- 这种接口修改策略显著提高了基于LGPS的ASSLSB的稳定性和周期寿命.
- 这些发现为开发高性能固态电池提供了新的途径.
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