Synthesis of the Metastable Cubic Phase of Li2OHCl by a Mechanochemical Method

Synthesis of the Metastable Cubic Phase of Li2OHCl by a Mechanochemical Method

The oxyhalide-based solid electrolyte Li2OHCl usually forms the thermodynamically stable orthorhombic phase at room temperature and shows poor lithium ionic conductivity. Above 35 °C, a structural phase transition into the cubic phase occurs and ionic conductivity is enhanced. In this work, mechanoc...

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Veröffentlicht in:Inorganic chemistry 2020-09, Vol.59 (17), p.11901-11904
Hauptverfasser: Yamamoto, Takayuki, Shiba, Hinata, Mitsukuchi, Naohiro, Sugumar, Manoj Krishna, Motoyama, Munekazu, Iriyama, Yasutoshi
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container_end_page 11904
container_issue 17
container_start_page 11901
container_title Inorganic chemistry
container_volume 59
creator Yamamoto, Takayuki
Shiba, Hinata
Mitsukuchi, Naohiro
Sugumar, Manoj Krishna
Motoyama, Munekazu
Iriyama, Yasutoshi
description The oxyhalide-based solid electrolyte Li2OHCl usually forms the thermodynamically stable orthorhombic phase at room temperature and shows poor lithium ionic conductivity. Above 35 °C, a structural phase transition into the cubic phase occurs and ionic conductivity is enhanced. In this work, mechanochemical synthesis of Li2OHCl is reported. The as-prepared Li2OHCl formed a cubic Pm3̅m structure and showed an ionic conductivity of 2.6 × 10–6 S cm–1 at 25 °C. Once the cubic phase was treated at 200 °C, the orthorhombic Pmc21 structure appeared at 25 °C and the ionic conductivity decreased down to 1.4 × 10–7 S cm–1. Formation of the metastable cubic phase could be explained in terms of low crystallinity of Li2OHCl derived from mechanochemical synthesis.
doi_str_mv 10.1021/acs.inorgchem.0c01631
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