Citation: Shubin Lei, Jing Han, Xinyi Wang, Junpeng Zhou, Xinfeng Chen, Tingzhen Yao, Jiaying Bi, Meixia Xiao. A fluorinated electrolyte design enabling nonflammability and stable 4.8 V cycling of Li||NCM811 batteries[J]. Chinese Chemical Letters, ;2026, 37(12): 112802. doi: 10.1016/j.cclet.2026.112802 shu

A fluorinated electrolyte design enabling nonflammability and stable 4.8 V cycling of Li||NCM811 batteries

Shubin Lei ^a ,
Jing Han ^{a, *,} ,
Xinyi Wang ^a ,
Junpeng Zhou ^a ,
Xinfeng Chen ^b ,
Tingzhen Yao ^a ,
Jiaying Bi ^a ,
Meixia Xiao ^a

a.
College of New Energy, Xi’an Shiyou University, Xi’an 710065, China
b.
Runpeng Semiconductor (Shenzhen) Co., Ltd., Shenzhen 518101, China

jinghan@xsyu.edu.cn

Received Date: 23 January 2026
Revised Date: 7 April 2026
Accepted Date: 20 April 2026
Available Online: 22 April 2026

Figures(4)

The pursuit of higher driving ranges for electric vehicles has driven continuous improvement in the energy density of lithium-ion batteries. High-voltage lithium metal batteries have emerged as promising next-generation energy storage devices due to their potential to achieve energy densities exceeding 400 Wh/kg. However, as the charging cut-off voltage increases, the interface between the NCM811 cathode and electrolyte deteriorates severely, resulting in degraded cycling performance and raising safety concerns. In this study, a fluorinated electrolyte was employed to construct a LiF-rich cathode electrolyte interphase (CEI), which effectively suppressed interfacial degradation and significantly enhanced the cycle life and safety of Li||NCM811 cells. The Li||NCM811 cell retained 83.2% of its capacity after 500 cycles even at 4.8 V, far exceeding the 41.0% capacity retention achieved with a commercial electrolyte. The modified electrolyte also demonstrates superior compatibility with the lithium-metal anode compared to conventional commercial electrolytes. Moreover, the designed electrolyte exhibits flame-retardant properties, thereby preserving safety performance. This work contributes to achieving stable operation of lithium metal batteries under high voltages and promotes their further commercialization.
- Liquid electrolyte,
- Electrode-electrolyte interphase,
- High voltage,
- NCM811,
- Lithium metal battery
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