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Updated: Aug 25, 2025
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Published on: March 7, 2018
Revealing the Electrochemistry of Solid-State Li-SeS2 Battery via In-Situ Transmission Electron Microscopy
Zaifa Wang1, Baiyu Guo1, Jitong Yan1
1Clean Nano Energy Center, State Key Laboratory of Metastable Materials Science and Technology, Yanshan University, Qinhuangdao, 066004, P. R. China.
Abstract:
Sex Sy is considered as a promising cathode material as it can deliver higher energy density than selenium (Se) and offer improved conductivity and enhanced reaction kinetics compared with S. However, the electrochemistry of the Li-SeS2 all-solid-state battery (ASSB) has not been well understood to date. Herein the electrochemistry of Li-SeS2 battery was revealed by in-situ transmission electron microscopy. The charge products were phase-separated Se and S, rather than the widely believed SeS2 . Among the various Sex Sy cathodes, SeS2 achieved the best electrochemical performance. The Li-SeS2 ASSB delivered a high reversible capacity of 1052 mAh g-1 at 1 A g-1 over 350 cycles, and a high areal capacity of 4 mAh cm-2 was also achieved with a high cathode mass loading of 7.6 mg cm-2 . These results represent the best performance achieved to date in the Li-SeS2 ASSB and brings us one step closer toward its practical applications.
