High ionic conductivity of multivalent cation doped Li6PS5Cl solid electrolytes synthesized by mechanical milling

The performances of next generation all-solid-state batteries might be improved by using multi-valent cation doped Li6PS5Cl solid electrolytes. This study provided solid electrolytes at room temperature using planetary ball milling without heat treatment. Li6PS5Cl was doped with a variety of multiva...

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Bibliographic Details
Published in:RSC advances 2020-06, Vol.10 (38), p.22304-22310
Main Authors: Hikima, Kazuhiro, Nguyen Huu Huy Phuc, Tsukasaki, Hirofumi, Mori, Shigeo, Muto, Hiroyuki, Matsuda, Atsunori
Format: Article
Language:English
Subjects:
Ball milling
Cations
Chemistry
Conductors
Crystallites
Diffraction patterns
Doping
Electrolytes
Electron diffraction
Grain boundaries
Heat treatment
Ion currents
Ions
Lithium ions
Mechanical milling
Molten salt electrolytes
Rechargeable batteries
Room temperature
Solid electrolytes
Solid state
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Summary:The performances of next generation all-solid-state batteries might be improved by using multi-valent cation doped Li6PS5Cl solid electrolytes. This study provided solid electrolytes at room temperature using planetary ball milling without heat treatment. Li6PS5Cl was doped with a variety of multivalent cations, where an electrolyte comprising 98% Li6PS5Cl with 2% YCl3 doping exhibited an ionic conductivity (13 mS cm−1) five times higher than pure Li6PS5Cl (2.6 mS cm−1) at 50 °C. However, this difference in ionic conductivity at room temperature was slight. No peak shifts were observed, including in the synchrotron XRD measurements, and the electron diffraction patterns of the nano-crystallites (ca. 10–30 nm) detected using TEM exhibited neither peak shifts nor new peaks. The doping element remained at the grain boundary, likely lowering the grain boundary resistance. These results are expected to offer insights for the development of other lithium-ion conductors for use in all-solid-state batteries.
ISSN:2046-2069
DOI:10.1039/d0ra02545c