Introduction to Methyl (2,2,2-trifluoroethyl) Carbonate
FEMC Basic Chemical Information
Name: Methyl (2,2,2-trifluoroethyl) Carbonate
Molecular formula: C₄H₅F₃O₃
Molecular weight: 158.08
Boiling point: 103 °C (760 mmHg)
FEMC is a fluorinated derivative of the conventional lithium-ion Electrolyte Solvent EMC (ethyl methyl carbonate). The introduction of fluorine markedly enhances thermal and electrochemical stability. The –CF₃ group in FEMC lowers both the HOMO and LUMO energy levels, raising the electrolyte’s oxidative-decomposition potential. Thanks to the comprehensive advantages imparted by fluorine, FEMC has become an essential Battery Electrolyte Additive or Fluorinated Solvent for high-safety, high-energy-density lithium-ion battery systems.
The application of Methyl (2,2,2-trifluoroethyl) Carbonate in lithium-ion batteries
1. Enhanc cycling stability under high-voltage conditions
Zhengcheng Zhang et al. investigated the beneficial effect of FEMC on the cycling performance of high-voltage LMNO cells. Using a fluorinated blend of 1.2 M LiPF₆ in F-AEC (4-[2,3,3,3-tetrafluoro-2-(trifluoromethyl)propyl]ethylene carbonate), FEMC (2,2,2-trifluoroethyl methyl carbonate) and F-EPE (1,1,2,2-tetrafluoroethyl-2,2,3,3-tetrafluoropropyl ether), the electrolyte exhibited excellent oxidation resistance at 5 V. The incorporation of FEMC markedly enhanced the cycle life of the High Voltage Battery.
2. Strengthen cathode stability while suppressing interfacial side reactions at the anode
Yu-Mi Lee et al. demonstrated that adding 5 % FEMC to NCM523 cells effectively suppresses transition-metal dissolution from the LiNi₀.₅Co₀.₂Mn₀.₃O₂ cathode, markedly enhancing its cycling stability. Moreover, FEMC which possess a lower LUMO level than EMC counterpart can form a robust and LiF-rich Solid Electrolyte Interphase (SEI). Through the synergistic stabilization of both cathode and anode interfaces, FEMC-a Film Forming Additive, markedly enhances the cycling performance of NCM523 batteries.
3. Enhance flame retardant characteristics and boost overall battery safety
As a Solvent Additives in lithium-ion battery electrolytes, FEMC markedly improves flame retardancy. Gyeong-Jun Chung et al. demonstrated through self-extinguishing time (SET) tests and differential scanning calorimetry (DSC) measurements on cathode–electrolyte couples that FEMC enhances the non-flammability of NCM622 systems. FEMC is a kind of Flame Retarding Additives, which can elevate thermal stability and strengthen overall battery safety.
Other fields
FEMC framework contains trifluoroethyl and carbonate moieties, which can endow it with high reactivity and selectivity in fluorinated fine-chemical synthesis. FEMC is a valuable fluorinated building block for the preparation of a wide range of high-value-added fluorinated specialty chemicals.
Technical challenges and optimization strategies for FEMC
Although FEMC has demonstrated remarkable advantages in lithium-ion electrolytes, its formulation still demands further optimization:
1. The –CF₃ group in the FEMC skeleton weakens Li⁺ solvation and lowers ionic conductivity.
Consequently, FEMC content must be precisely controlled to strike a balance between flame-retardance and conductivity.
2. In neat FEMC-based electrolytes, Li⁺ readily coordinates with FEMC and further depresses the LUMO level and triggering continuous. This leads to irreversible decomposition of the electrolyte on the graphite interface with persistent gas generation.
Tuning the FEMC ratio and co-formulating with additional solvent or Electrolyte Additive are therefore active research directions for developing stable, high-voltage FEMC-based electrolytes.
FEMC of Cheerchem
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