Vinylethylene Carbonate (VEC)

Vinylethylene Carbonate（VEC）

Synonyms：4-vinyl-1,3-dioxolan-2-one

CAS No.：4427-96-7

EINECS No.：212-825-5

Molecular Formula：C₃H₂O₃

Molecular Weight：86.046

Structure Formula：

Standard：

Properties：It is a colorless transparent liquid. Insoluble in water. Boiling point: 237℃, Density (25℃) : 1.118g/ml, Flash point: 96℃, Refractive index: 1.4474.

Uses：Vinylethylene carbonate is mainly used as a film additive for lithium-ion batteries. This product has a high reduction potential, so in the process of chemical synthesis, it can prior to the electrolyte to make electrochemical reduction reaction on the surface of the graphite cathode, and form a thicker and larger impedance SEI film. The film is stable at room and high temperature, and not easy to decompose, which can inhibit the reduction and decomposition reaction of the electrolyte on the surface of graphite cathode and reduces the generation of gas products. Beside, it avoid damage to the structure and performance of the cathode material, the capacity retention rate is improved at room temperature, especially at high temperature, and the flatulence of the battery is inhibited. The SEI film has good cycling performance, but the impedance is large, which is not conducive to the lithium deintercalation, the capacity and efficiency of the first charge and discharge are low.

Storage：Store in a cool, dry and ventilated place. Keep away from heat and fire sources. Avoid direct light irradiation. Don’t contact with oxides, reducing agents, acids and bases. The recommended storage temperature is below 25°C. The shelf life is 6 months.

Packing：20kg or 200kg stainless steel drums with quick joints and filled with nitrogen protection (Nitrogen pressure 0.11-0.13mpa).