Vinylethylene Carbonate（VEC）

Synonyms：4-vinyl-1,3-dioxolan-2-one; VEC

CAS No.：4427-96-7

EINECS No：212-825-5

Molecular Formula：C₃H₂O₃

Molecular Weight：86.046

Structure Formula：

                          

Standard：

Items	Specifications
Appearance	Colorless transparent liquid
Color（APHA）	≤20
Purity（GC）	≥99.9%
Water（Karl-Fischer）	≤50ppm

Properties：Vinylethylene Carbonate 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 anode, and form a thicker and larger impedance SEI film. This 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 the graphite negative electrode and reduces the formation of gaseous products. The structure and performance of the negative electrode material are avoided, the capacity retention rate of the battery 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：Keep in a well-closed, light-resistance container. Store in a cool, ventilated and dry warehouse. Keep away from heat and fire sources. Don’t contact with oxides, reducing agents, acids and bases. The shelf life is 6 months below 25°C.

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