Citation: Liang Ming, Miao Deng, Siwu Li, Ziling Jiang, Lin Li, Ziyu Lu, Qiyue Luo, Jie Yang, Zhonghui Cui, Chuang Yu. Reviving the ionic conductivity of air-instable solid-state electrolytes via a facile heat treatment[J]. Chinese Chemical Letters, ;2026, 37(7): 111114. doi: 10.1016/j.cclet.2025.111114 shu

Reviving the ionic conductivity of air-instable solid-state electrolytes via a facile heat treatment

Liang Ming ^{a, b, 1} ,
Miao Deng ^{a, b, 1} ,
Siwu Li ^{c, *,} ,
Ziling Jiang ^{a, b} ,
Lin Li ^{a, b} ,
Ziyu Lu ^{a, b} ,
Qiyue Luo ^{a, b} ,
Jie Yang ^{a, b} ,
Zhonghui Cui ^{d, *,} ,
Chuang Yu ^{a, b, *,}

a.
School of Chemistry and Chemical Engineering, Huazhong University of Science and Technology, Wuhan 430074, China
b.
State Key Laboratory of Advanced Electromagnetic Engineering and Technology, School of Electrical and Electronic Engineering, Huazhong University of Science and Technology, Wuhan 430074, China
c.
Academy of Advanced Interdisciplinary Research, Xidian University, Xi’an 710071, China
d.
Zhejiang Intelligent Transportation Technology Innovation Center, Ningbo 315000, China

lisiwu@xidian.edu.cn

zhonghui.cui@gmail.com

cyu2020@hust.edu.cn

Received Date: 21 December 2024
Revised Date: 13 March 2025
Accepted Date: 18 March 2025
Available Online: 18 March 2025

Figures(5)

The quest for sustainable and efficient energy storage solutions has led to significant advancements in the field of solid-state batteries, with a particular focus on solid-state electrolytes (SSEs) especially highly ionic conductive sulfide and halide materials. However, the air instability of these SSEs not only limits their mass production but also poses environmental and safety risks. Herein, the damage of humid-air exposure on the structure and electrochemical properties of Li_5.5PS_4.5Cl_0.8Br_0.7 and Li₃InCl₆ is evaluated, and a subsequent heat treatment is proposed and proven effective to recover the damage, whose mechanisms are pinpointed through XRD data with Retvield refinement. For the exposed samples, a lattice contraction occurs as the hydrolysis reaction caused by H₂O from humid air severely damages the structure, which impedes lithium-ion transport. After heat treatment, a lattice rearrangement can rebuild sufficient lithium-ion pathway in the material, leading to the greatly improved ionic conductivity. As a result, the treated electrolytes provide greatly promoted ionic conductivity (from 0.95 mS/cm to 1.8 mS/cm for Li₃InCl₆, from 1.24 S/cm to 7.04 S/cm for Li_5.5PS_4.5Cl_0.8Br_0.7). More importantly, ASSBs employed with the treated electrolytes achieve outstanding long-term cycling and rate performance, even guarantee considerable capacity output of ~217 and ~159 mAh/g under extreme conditions of 60 and –20 ℃, illustrating significantly improved electrochemical reaction kinetics and the impressive reliability of the heat treatment method.
- All-solid-state lithium batteries,
- Sulfide electrolyte,
- Halide electrolyte,
- Ionic conductivity,
- Air stability
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