Solid Electrolyte with Oxidation Tolerance Provides a High-Capacity Li2S-Based Positive Electrode for All-Solid-State Li/S Batteries
Solid Electrolyte with Oxidation Tolerance Provides a High-Capacity Li2S-Based Positive Electrode for All-Solid-State Li/S Batteries
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DOI：
10.1002/adfm.202106174
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发表时间：
2021-10-27
影响因子：
19
通讯作者：
Hayashi, Akitoshi
中科院分区：
文献类型：
--
作者：
Hakari, Takashi;Fujita, Yushi;Hayashi, Akitoshi
固体电解质的电化学窗口在高能量密度全固态电池活性材料-固体电解质界面设计中起着至关重要的作用。然而，对于单个活性材料合适的电化学窗口还没有研究，因为se的电化学窗口被高估了。在本研究中，确定了几种se的氧化起始电压（OOVs），即与Li2S作为高容量正极材料相容的se。结果表明，低oov的se降低了相应assb的容量，增加了界面阻力。要获得高容量，SE的oov必须超过Li2S 0.2 V以上，而这又取决于SE的离子电导率。因此，Li2S正极与具有高oov和离子电导率的伪二元锂氧酸盐结合作为SEs，可获得高容量（500 Wh kg(-1)）、高Li2S含量的ASSB。
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 Li2S 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 Li2S by more than 0.2 V to achieve high capacity, which in turn depends on SE ionic conductivity. Therefore, an Li2S 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 Li2S content.