Structural regulation of halide superionic conductors for all-solid-state lithium batteries

Xiaona Li, Jung Tae Kim, Jing Luo, Changtai Zhao, Yang Xu, Tao Mei, Ruying Li, Jianwen Liang () and Xueliang Sun ()
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Xiaona Li: Eastern Institute of Technology
Jung Tae Kim: University of Western Ontario
Jing Luo: University of Western Ontario
Changtai Zhao: Solid State Batteries Research Center, GRINM (Guangdong) Institute for Advanced Materials and Technology
Yang Xu: Solid State Batteries Research Center, GRINM (Guangdong) Institute for Advanced Materials and Technology
Tao Mei: Hubei University
Ruying Li: University of Western Ontario
Jianwen Liang: University of Western Ontario
Xueliang Sun: University of Western Ontario

Nature Communications, 2024, vol. 15, issue 1, 1-8

Abstract: Abstract Metal halide solid-state electrolytes have gained widespread attention due to their high ionic conductivities, wide electrochemical stability windows, and good compatibility with oxide cathode materials. The exploration of highly ionic conductive halide electrolytes is actively ongoing. Thus, understanding the relationship between composition and crystal structure can be a critical guide for designing better halide electrolytes, which still remains obscure for reliable prediction. Here we show that the cationic polarization factor, which describes the geometric and ionic conditions, is effective in predicting the stacking structure of halide electrolytes formation. By supplementing this principle with rational design and preparation of more than 10 lithium halide electrolytes with high conductivity over 10−3 S cm−1 at 25 °C, we establish that there should be a variety of promising halide electrolytes that have yet to be discovered and developed. This methodology may enable the systematic screening of various potential halide electrolytes and demonstrate an approach to the design of halide electrolytes with superionic conductivity beyond the structure and stability predictions.

Date: 2024
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DOI: 10.1038/s41467-023-43886-9

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