I. Physical and Chemical Properties

Vinylene Carbonate (VEC), also known as 4-vinyl-1,3-dioxolan-2-one, English name: Vinylene Carbonate, abbreviation VEC, molecular formula C₅H₆O₃, molecular weight: 114.10, CAS No.: 4427-96-7. It is a colorless transparent liquid with a boiling point of 237°C (at atmospheric pressure).

II. Quality Specifications

III. Applications

As a highly reactive film-forming additive in lithium secondary batteries. VEC has a high dielectric constant, high boiling point and flash point, which helps improve the safety performance of lithium-ion batteries. VEC begins to decompose at 1.35V and can form a stable and dense SEI film on flake graphite, effectively preventing PC and solvated lithium ions from co-intercalating into the graphite interlayers, minimizing electrolyte decomposition, thereby improving the charge-discharge efficiency and cycling characteristics of lithium-ion batteries. It is chemically stable; when a certain amount of VEC is added to the electrolyte at an appropriate temperature, it significantly improves the cycling performance of the cathode metal. After multiple charge-discharge cycles, the retained discharge capacity can increase from 68.8% to 84.8%. According to test results, the addition of VEC causes the CO₂ peak to disappear during the second charge-discharge cycle and significantly reduces CO₂ release. This demonstrates that both the anode and cathode form stable SEI layers with the participation of VEC.

IV. Packaging Specifications

20kg/drum, 200kg/drum