Citation: Xuning Gao, Nan Piao, Yukun Yan, Jinghao Wang, Haolun Zou, Siqi Guan, Leiying Zeng, Zhenhua Sun, Guangjian Hu, Feng Li. Synergistic fluorinated and non-fluorinated solvents for electrolytes of lithium-ion batteries at low temperatures[J]. Chinese Chemical Letters, ;2026, 37(2): 110591. doi: 10.1016/j.cclet.2024.110591 shu

Synergistic fluorinated and non-fluorinated solvents for electrolytes of lithium-ion batteries at low temperatures

Xuning Gao ^{a, b} ,
Nan Piao ^{a, b, *,} ,
Yukun Yan ^b ,
Jinghao Wang ^{a, b} ,
Haolun Zou ^{a, b} ,
Siqi Guan ^c ,
Leiying Zeng ^d ,
Zhenhua Sun ^{a, b} ,
Guangjian Hu ^{a, b, *,} ,
Feng Li ^{a, b, *,}

a.
School of Materials Science and Engineering, University of Science and Technology of China, Hefei 230026, China
b.
Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China
c.
Institute of Energy Materials and Electrochemistry Research, University of Science and Technology Liaoning, Anshan 114051, China
d.
XTC New Energy Materials (Xiamen) Co., Ltd., Xiamen 361000, China

npiao@imr.ac.cn

gjhu@imr.ac.cn

fli@imr.ac.cn

Received Date: 10 September 2024
Revised Date: 23 October 2024
Accepted Date: 29 October 2024
Available Online: 31 October 2024

Figures(5)

Commercial carbonate electrolytes suffer from ion transport difficulty in bulk electrolytes and interphase at low temperatures, bringing challenges to the application of lithium-ion batteries (LIBs) at low temperatures. Herein, the ester solvent of methyl propionate (MP) with low melting point and low viscosity was used to tackle ion transport difficulty in electrolytes. Fluorinated ester was further added to accelerate interfacial transport through intermolecular interactions. The influence of fluorinated esters with different fluorination degrees on the solvation structure of electrolytes and the performance of batteries was further studied. As a result, methyl pentafluoropropionate (M5F) with five fluorine atoms was selected for its optimal interactions with both Li⁺ and MP solvent in the primary solvation structure, contributing to desired solvation structure for fast interfacial transport. The LiFePO₄ (LFP)||graphite cell with LiFSI-MP-M5F electrolyte exhibited a high cyclability of 85.8% after 120 cycles and retained 81.2% of room-temperature capacity when charged and discharged at −30 ℃. 1 Ah LFP||graphite pouch cell with high cathode loading (20 mg/cm²) in LiFSI-MP-M5F electrolyte exhibited 0.85 Ah capacity when charged and discharged at −20 ℃. This work provides a guidance for electrolyte design by synergistic fluorinated and non-fluorinated solvents for LIBs at low-temperature application.
- Lithium-ion batteries,
- Electrolyte,
- Fluorinated solvent,
- Non-fluorinated solvent,
- Solvation structure,
- Low temperatures
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