Revealing performance of 78Li2S-22P2S5 glass ceramic based solidstate batteries at different operating temperatures
发布时间：2022-12-26
点击次数：
- 论文类型：
- 期刊论文
- 发表刊物：
- Chinese Chemical Letters
- 收录刊物：
- SCI
- 所属单位：
- 华中科技大学电气与电子工程学院
- 刊物所在地：
- 中国
- 学科门类：
- 理学
- 一级学科：
- 化学
- 文献类型：
- J
- 关键字：
- 78Li2S-22P2S5 electrolytes, Li-ion conductivity, operating temperature, battery performance, volume changes, interfacial resistance
- DOI码：
- 10.1016/j.cclet.2022.107859
- 发表时间：
- 2022-10-01
- 影响因子：
- 8.455
- 教研室：
- 电力系
- 摘要：
- 78Li2S-22P2S5 are sulfide electrolytes with high lithium-ion conductivity and wide electrochemical windows in the Li2S-P2S5 system, making them attractive solid electrolytes for ASSLBs. However, the role and potential of 78Li2S-22P2S5 solid electrolytes over a wide temperature range are still not fully understood. Therefore, we constructed solid-state batteries with NCM622 as the positive electrode and 78Li2S-22P2S5 glass-ceramics as the electrolyte to investigate in depth the differences in battery performance over a wide temperature range and their intrinsic mechanisms. The in-situ impedance and relaxation time distribution (DRT) demonstrated the electrochemical stability of the electrolyte over a wide temperature range, while the in-situ stacking pressure observed a large volume change during cycling at 60 °C, leading to local solid-solid contact failure and poor cycling stability. This study provides insight into the advantages and problems of 78Li2S-22P2S5 in the wide temperature range as well as a basis for the construction of ASSLBs with high energy density and long cycle life.