Ternary Rotational Polyanion Coupling Enables Fast Li Ion Dynamics in Tetrafluoroborate Ion Doped Antiperovskite Li2OHCl Solid Electrolyte

Juncao Bian, Sifan Ling, Bei Deng, Haibin Lin, Ruo Zhao, Long Kong, Huimin Yuan, Jinlong Zhu, Songbai Han, Liping Wang, Rui Qin Zhang, Yusheng Zhao, Zhouguang Lu

科研成果: 期刊稿件文章同行评审

5 引用 (Scopus)

摘要

Li-rich antiperovskite (LiRAP) hydroxyhalides are emerging as attractive solid electrolyte (SEs) for all-solid-state Li metal batteries (ASSLMBs) due to their low melting point, low cost, and ease of scaling-up. The incorporation of rotational polyanions can reduce the activation energy and thus improve the Li ion conductivity of SEs. Herein, we propose a ternary rotational polyanion coupling strategy to fasten the Li ion conduction in tetrafluoroborate (BF4) ion doped LiRAP Li2OHCl. Assisted by first-principles calculation, powder X-ray diffraction, solid-state magnetic resonance and electrochemical impedance spectra, it is confirmed that Li ion transport in BF4 ion doped Li2OHCl is strongly associated with the rotational coupling among OH, BF4 and Li2−O−H octahedrons, which enhances the Li ion conductivity for more than 1.8 times with the activation energy lowering 0.03 eV. This work provides a new perspective to design high-performance superionic conductors with multi-polyanions.

源语言英语
文章编号e202400144
期刊Angewandte Chemie - International Edition
63
28
DOI
出版状态已出版 - 8 7月 2024

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