High Ionic Conductivity with Improved Lithium Stability of CaS- and CaI2‑Doped Li7P3S11 Solid Electrolytes Synthesized by Liquid-Phase Synthesis

Li7P3S11 solid electrolytes (SEs) subjected to liquid-phase synthesis with CaS or CaI2 doping were investigated in terms of their ionic conductivity and stability toward lithium anodes. No peak shifts were observed in the XRD patterns of CaS- or CaI2-doped Li7P3S11, indicating that the doping elemen...

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Bibliographic Details
Published in:ACS omega 2022-05, Vol.7 (19), p.16561-16567
Main Authors: Hikima, Kazuhiro, Kusaba, Ikuyo, Gamo, Hirotada, Phuc, Nguyen Huu Huy, Muto, Hiroyuki, Matsuda, Atsunori
Format: Article
Language:English
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Summary:Li7P3S11 solid electrolytes (SEs) subjected to liquid-phase synthesis with CaS or CaI2 doping were investigated in terms of their ionic conductivity and stability toward lithium anodes. No peak shifts were observed in the XRD patterns of CaS- or CaI2-doped Li7P3S11, indicating that the doping element remained at the grain boundary. CaS- or CaI2-doped Li7P3S11 showed no internal short circuit, and the cycling continued, indicating that not only CaI2 including I– but also CaS could help increase the lithium stability. These results provide insights for the development of sulfide SEs for use in all-solid-state batteries in terms of their ionic conductivity and stability toward lithium anodes.
ISSN:2470-1343
2470-1343
DOI:10.1021/acsomega.2c00546