Indexed by: Journal paper

Journal: Chinese Chemical Letters

Included Journals: SCI

Affiliation of Author(s): 华中科技大学电气与电子工程学院

Place of Publication: 中国

Discipline: Science

First-Level Discipline: Chemistry

Document Type: J

Key Words: 78Li2S-22P2S5 electrolytes, Li-ion conductivity, operating temperature, battery performance, volume changes, interfacial resistance

DOI number: 10.1016/j.cclet.2022.107859

Date of Publication: 2022-10-01

Impact Factor: 8.455

Teaching and Research Group: 电力系

Abstract: 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.