Preparation of Li-Excess and Li-Deficient Antiperovskite Structured Li2+ xOH1- xBr and Their Effects on Total Ionic Conductivity

Manoj Krishna Sugumar, Takayuki Yamamoto, Kazutaka Ikeda, Munekazu Motoyama, Yasutoshi Iriyama

Research output: Contribution to journalArticlepeer-review

Abstract

This paper describes about the effect of Li-H exchange amount on total lithium-ion (Li+) conductivity of Li2+xOH1-xBr (x = -0.5 to +0.4). These samples are systematically prepared at room temperature by a dry ball-milling process using LiOH, LiOH·H2O, Li2O, and LiBr as starting materials. Synchrotron X-ray diffraction analysis reveals that single-phase Li2+xOH1-xBr samples are formed within x = -0.5 to +0.35. For improving total Li+conductivity (σt), a larger x value increases both the Li carrier density and lattice constant as positive factors, while that decreases both the crystallite size and OH rotational unit possibly assisting Li+conduction as negative factors. This trade-off provides an optimized σtof 3.6 × 10-6S cm-1at the Li-excess Li2.2OH0.8Br composition, which is ca. 3 times higher than pristine Li2OHBr (1.1 × 10-6S cm-1). The hydrogen incorporation into the lattice is confirmed by neutron diffraction analysis, and the refined composition is almost consistent with the prepared composition.

Original languageEnglish
Pages (from-to)4655-4659
Number of pages5
JournalInorganic chemistry
Volume61
Issue number11
DOIs
Publication statusPublished - Mar 21 2022
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Physical and Theoretical Chemistry
  • Inorganic Chemistry

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