Boosting Lithium Ion Conductivity of Antiperovskite Solid Electrolyte by Potassium Ions Substitution for Cation Clusters

Overview

Journal Nat Commun

Specialty Biology

Date 2023 Oct 26

PMID 37884502

Authors

Lei Gao

Xinyu Zhang

Jinlong Zhu

Songbai Han

Hao Zhang

Liping Wang

Ruo Zhao

Song Gao

Shuai Li

Yonggang Wang

Dubin Huang

Yusheng Zhao

Ruqiang Zou

Affiliations

Soon will be listed here.

Abstract

Solid-state electrolytes with high ionic conductivities are crucial for the development of all-solid-state lithium batteries, and there is a strong correlation between the ionic conductivities and underlying lattice structures of solid-state electrolytes. Here, we report a lattice manipulation method of replacing [LiOH] clusters with potassium ions in antiperovskite solid-state electrolyte (LiOH)KCl, which leads to a remarkable increase in ionic conductivity (4.5 × 10 mS cm, 25 °C). Mechanistic analysis indicates that the lattice manipulation method leads to the stabilization of the cubic phase and lattice contraction for the antiperovskite, and causes significant changes in Li-ion transport trajectories and migration barriers. Also, the Li||LiFePO all-solid-state battery (excess Li and loading of 1.78 mg cm for LiFePO) employing (LiOH)KCl electrolyte delivers a specific capacity of 116.4 mAh g at the 150th cycle with a capacity retention of 96.1% at 80 mA g and 120 °C, which indicates potential application prospects of antiperovskite electrolyte in all-solid-state lithium batteries.

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