Citation: Haining Peng, Huijun Liu, Chengzong Li, Yingfu Li, Qizhi Chen, Tao Li. Diluent modified weakly solvating electrolyte for fast-charging high-voltage lithium metal batteries[J]. Chinese Chemical Letters, ;2025, 36(1): 109556. doi: 10.1016/j.cclet.2024.109556 shu

Diluent modified weakly solvating electrolyte for fast-charging high-voltage lithium metal batteries

Haining Peng ^a ,
Huijun Liu ^{a, *,} ,
Chengzong Li ^b ,
Yingfu Li ^a ,
Qizhi Chen ^a ,
Tao Li ^{b, *,}

a.
School of Chemistry and Chemical Engineering, University of South China, Hengyang 421000, China
b.
School of Resource Environment and Safety Engineering, University of South China, Hengyang 421000, China

Received Date: 4 January 2024
Accepted Date: 23 January 2024
Available Online: 1 February 2024

Figures(4)

Weakly solvating electrolyte (WSE) demonstrates superior compatibility with lithium (Li) metal batteries (LMBs). However, its application in fast-charging high-voltage LMBs is challenging. Here, we propose a diluent modified WSE for fast-charging high-voltage LMBs, which is formed by adding diluent of 1,1,2,2-tetrafluoroethyl-2,2,3,3-tetrafluoropropyl ether (TTE) into the tetrahydropyran (THP) based WSE. A relatively loose solvation structure is formed due to the formation of weak hydrogen bond between TTE and THP, which accelerates the de-solvation kinetics of Li⁺. Besides, more anions are involved in solvation structure in the presence of TTE, yielding inorganic-rich interphases with improved stability. Li (30 µm)LiNi_0.5 Co_0.2Mn_0.3O₂ (4.1 mAh/cm²) batteries with the TTE modified WSE retain over 64% capacity retention after 175 cycles under high rate of 3 C and high-voltage of 4.5 V, much better than that with pure THP based WSE. This work points out that the combination of diluent with weakly solvating solvent is a promising approach to develop high performance electrolytes for fast-charging high-voltage LMBs.
- Lithium metal batteries,
- Weakly solvating electrolyte,
- Fast-charging,
- High-voltage,
- Diluent
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