Revealing performance of 78Li2S-22P2S5 glass ceramic based solid-state batteries at different operating temperatures

• Published in: Chinese chemical letters Vol. 34; no. 7; pp. 107859 - 422
• Main Authors: Wei, Chaochao, Liu, Xinrong, Yu, Chuang, Chen, Shaoqing, Chen, Shuai, Cheng, Shijie, Xie, Jia
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 01.07.2023; State Key Laboratory of Advanced Electromagnetic Engineering and Technology,School of Electrical and Electronic Engineering,Huazhong University of Science and Technology,Wuhan 430074,China; School of Chemistry and Chemical Engineering,Huazhong University of Science and Technology,Wuhan 430074,China%State Key Laboratory of Advanced Electromagnetic Engineering and Technology,School of Electrical and Electronic Engineering,Huazhong University of Science and Technology,Wuhan 430074,China%Department of Materials Science and Engineering,Southern University of Science and Technology,Shenzhen 518055,China
• Subjects: 78Li2S-22P2S5 electrolytes; Battery performance; Interfacial resistance; Li-ion conductivity; Operating temperature; Volume changes; Li-ion conductivity; 78Li2S-22P2S5 electrolytes; Battery performance; Volume changes; Interfacial resistance; Operating temperature
• ISSN: 1001-8417; 1878-5964
• DOI: 10.1016/j.cclet.2022.107859

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. Revealing the pressure and interfacial resistance variations of 78Li2S-22P2S5-based all-solid-state batteries under different operating temperatures is essential to achieving superior electrochemical performances. [Display omitted]