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Solid Electrolyte with Oxidation Tolerance Provides a High‐Capacity Li 2 S‐Based Positive Electrode for All‐Solid‐State Li/S Batteries
Author(s) -
Hakari Takashi,
Fujita Yushi,
Deguchi Minako,
Kawasaki Yusuke,
Otoyama Misae,
Yoneda Yohei,
Sakuda Atsushi,
Tatsumisago Masahiro,
Hayashi Akitoshi
Publication year - 2022
Publication title -
advanced functional materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 6.069
H-Index - 322
eISSN - 1616-3028
pISSN - 1616-301X
DOI - 10.1002/adfm.202106174
Subject(s) - materials science , electrolyte , electrochemistry , electrochemical window , ionic conductivity , electrode , ionic bonding , fast ion conductor , solid state , chemical engineering , heat capacity , conductivity , thermodynamics , engineering physics , ion , chemistry , organic chemistry , engineering , physics
The electrochemical window of solid electrolytes (SEs) plays a crucial role in designing active material–SE interfaces in high‐energy‐density all‐solid‐state batteries (ASSBs). However, the suitable electrochemical window for individual active materials is not yet investigated, as the electrochemical window of SEs is overestimated. In this study, the oxidation onset voltages (OOVs) of several SEs, namely those compatible with Li 2 S as a high‐capacity positive electrode material are determined. Results reveal that SEs with low OOVs decrease the capacity and increase the interfacial resistance of the corresponding ASSBs. The OOVs of SEs must exceed that of Li 2 S by more than 0.2 V to achieve high capacity, which in turn depends on SE ionic conductivity. Therefore, an Li 2 S positive electrode is combined with pseudobinary Li‐oxyacid salts as SEs, exhibiting high OOVs and ionic conductivities, to afford a high‐capacity (500 Wh kg −1 ) ASSB with high Li 2 S content.