Improvement of Stability and Solid-State Battery Performances of annealed 70Li2S-30P2S5 electrolytes by Additives
发布时间：2022-02-08
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- 论文类型：
- 期刊论文
- 发表刊物：
- Rare Metals
- 收录刊物：
- SCI
- 所属单位：
- School of Electrical and Electronic Engineering, Huazhong University of Science and Technology
- 学科门类：
- 工学
- 一级学科：
- 材料科学与工程
- 文献类型：
- J
- DOI码：
- 10.1007/s12598-021-01804-2
- 发表时间：
- 2021-08-08
- 影响因子：
- 4.003
- 摘要：
- The replacement of liquid electrolytes with solid electrolytes can significantly improve the safety and power/energy density of lithium batteries. 70Li2S-30P2S5 is one of the most promising solid electrolytes with high conductivity for solid-state batteries. In this work, the ionic conductivity and stability towards moisture and lithium metal of 70Li2S-30P2S5 were enhanced by introducing the different amounts of Li2O additives. 65Li2S-30P2S5-1%Li2O delivered the highest conductivity, while 65Li2S-30P2S5-5%Li2O showed the best moisture stability and improved lithium compatibility. Solid-state batteries using 65Li2S-30P2S5-5%Li2O electrolyte and high voltage LiNi0.6Mn0.2Co0.2O2 cathode exhibited low initial discharge capacity (100 mAh/g) and coulombic efficiency (69%). Li3InCl6 electrolytes were introduced both in the cathode mixture to replace sulfide electrolyte and in the interface layer to improve the cathode compatibility for the solid-state batteries, showing enhanced discharge capacity (175 mAh/g) and improved initial coulombic efficiency (86%). Moreover, it also exhibited good performance at -20 oC.