From Physical Properties to Advantages: A Comprehensive Look at FEMC’s “Fluorine” Power in Lithium‑Ion Batteries
2025-10-22 00:00
Introduction to FEMC
Basic Chemical Information of FEMC
Chinese name: 2,2,2-Trifluoroethyl methyl carbonate
English name: 2,2,2-Trifluoroethyl methyl carbonate
Abbreviation: FEMC
Molecular formula: C₄H₅F₃O₃
Molecular weight: 158.08
Boiling point: 103°C (760 mmHg)
FEMC By incorporating it into conventional lithium-ion electrolyte solvents EMC Introduction into the structure of ethyl methyl carbonate -CF3 Functional group, significantly enhancing the solvent’s Thermal stability and Electrochemical stability [1] . -CF in the FEMC structure 3 The functional group can lower the energy level of its highest occupied molecular orbital (HOMO). Improve of the electrolyte Oxidation potential [2] . Thanks to the comprehensive performance advantages conferred by fluorine, FEMC has become a key functional solvent/additive in lithium-ion electrolytes, enhancing both stability and safety, in High security 、 High energy density It holds significant application potential in the lithium-battery field.
The role of FEMC in lithium batteries
Enhancing cycling stability under high-voltage conditions [2]
Zhengcheng Zhang et al. studied FEMC At high voltage LiNi 0.5 Mn 1.5 O 4 In the battery system, to Cycling performance The improvement effect. Studies have shown that using 1.2 M LiPF₆ dissolved in F-AEC (4-[2,3,3,3-Tetrafluoro-2-(trifluoromethyl)propyl]ethylene carbonate) When a mixed fluorinated electrolyte composed of FEMC (2,2,2-trifluoroethyl methyl carbonate) and F‑EPE (1,1,2,2-tetrafluoroethyl‑2,2,3,3‑tetrafluoropropyl ether) is employed, the system exhibits excellent oxidation stability at a high voltage of 5 V, with the incorporation of FEMC markedly enhancing the cycling performance of high‑voltage nickel–manganese oxide batteries.
Enhance cathode stability and reduce side reactions at the anode–electrolyte interface. [3]
Research by Yu-Mi Lee et al. indicates that adding 5% FEMC to the NCM523 battery system can effectively… Inhibition Positive electrode material L iNi 0.5 Co 0.2 Mn 0.3 O 2 During the loop process Transition metal leaching ， Improve During the cycling process, the cathode material… Stability Furthermore, compared with fluorine-free EMC, FEMC, owing to its lower lowest unoccupied molecular orbital (LUMO) energy level, preferentially forms a stable, LiF-rich interfacial film on the negative electrode surface, which effectively suppresses parasitic reactions at the electrode–electrolyte interface. By synergistically enhancing the interfacial stability of both the positive and negative electrodes, FEMC Significantly improve of the NCM523 battery Cycling performance 。
Enhance the battery’s flame-retardant properties and improve overall safety performance. [4]
As a co-solvent in lithium-ion battery electrolytes, FEMC can effectively enhance the flame retardancy of the electrolyte. Gyeong-jun Chung and colleagues, through experiments such as the self-extinguishing time (SET) test and differential scanning calorimetry (DSC) analysis of the cathode–electrolyte interface, demonstrated that FEMC can… Improve NCM622 system Flame retardancy , enhancing the battery system's Thermal stability ， Enhance battery safety performance 。
Other fields
FEMC The molecular structure contains a trifluoroethyl group and a carbonate group, enabling it to… Fluorine-containing fine chemicals has in the synthesis of Reactivity and Selectivity , is a promising fluorine-containing organic synthesis intermediate that can be used to synthesize a variety of High added value of Fluorine-containing fine chemicals 。
FEMC Technical Challenges and Optimization
FEMC Although its application in lithium-ion electrolytes has demonstrated significant advantages, the electrolyte formulation still requires optimization and improvement.
References:
[1] Shen Min, Jiang Zhimin, Li Nan, et al. High-safety lithium-ion battery electrolyte [J]. Energy Storage Science and Technology, 2018, 7, 1069–1081.
[3] Yu-Mi Lee, Kyoung-Mo Nam, Eui-Hyung Hwang, et al. Interfacial origin of performance improvement and fade for 4.6 V LiNi 0.5 Co 0.2 Mn 0.3 O 2 battery cathodes[J]. J. Phys. Chem. C, 2014, 118, 10631-10639.
[4] Gyeong-Jun Chung, Jisoo Han, Seung-Wan Song. Fire-preventing LiPF 6 and ethylene carbonate-based organic liquid electrolyte system for safer and outperforming Lithium-ion batteries[J]. ACS Appl. Mater. Interfaces, 2020, 12, 42868-42879.
[5] Mingsheng Qin, Ziqi Zeng, Fenfen Ma, et al. Doping in solvation structure: enabling fluorinated carbonate electrolyte for high-voltage and high-safety Lithium-ion batteries[J]. ACS Energy Lett., 2024, 9, 2536-2544.
Cheerchem Advanced Material' FEMC Product
Cheerchem Advanced Material Driven by technological innovation, we have successfully developed FEMC products with outstanding performance, establishing ourselves as a trusted partner in the lithium‑ion battery electrolyte sector.
Ultra-high purity: The product’s purity remains stable at 99.90% or higher.
Consistent quality: Cutting-edge manufacturing processes ensure the stability and reliability of every batch of products.
Worry-free supply: Sufficient production capacity and a mature supply chain ensure that we can meet the long-term needs of major customers.
Service First: We not only deliver products but also support customers in optimizing their electrolyte formulations, provide application‑level technical assistance, and work together with them to co‑create value.
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