Year: 2025
Type: article
Abstract: Conversion‐type metal fluorides (MFs) cathodes are promising candidates for high‐energy lithium–ion batteries. However, their cycling performance is limited due to the decomposition of organic solvent electrolytes at the cathode/electrolyte interface and the dissolution of active materials during cycling, especially at elevated temperatures (above 60 °C). To address these challenges, a thermally stable, organic solvent‐free electrolyte (OSFE) composed of three low melting alkali perfluorinated sulfonimide salts is developed, which helps to minimize the undesirable solvent decomposition. Additionally, chemical vapor deposition technology is employed to apply a conformal carbon coating to a representative MF, NiF2, effectively preventing the dissolution of active materials. The synergistic effect of OSFE and carbon coating enables a previously uncyclable NiF2 cathode, which exhibits a high reversible discharge capacity of 450 mAh g−1 after 160 cycles at 80 °C. Moreover, by incorporating 10 wt.% Li10GeP2S12 (LGPS) into the OSFE, the cycle number of NiF2 is extended to 300 cycles, maintaining an impressive discharge capacity of 350 mAh g−1 at 60 °C. These advancements highlight the potential for successful operation of MFs at elevated temperatures using OSFE, paving the way for their practical applications and future commercialization.
Source: Advanced Energy Materials
Authors: Yuxuan Zhang, Junyu Chen, Xuedong Zhang, Baiyu Guo, Zhihao Yan, Yali Liang, Yumeng Sun, Long Xie, Xin He, Hongxia Gu, Jianyu Huang, Qiao Huang
Language: English
Subfield: Electrical and Electronic Engineering
Field: Engineering
Domain: Physical Sciences
Open Access status: bronze
OpenAlex ID: W4409270108