4-vinyl-1, 3-Dioxolan-2-One
Alias: 4 - Ethenyl - 1, 3 dioxolan - 2 - one; Vinyl Ethylene Carbonate
Product name: ethylene carbonate ethyl ester
The molecular structure
Molecular formula: C5H6O3
Molecular weight: 114.10
CAS login Number: 4427-96-7
Physicochemical properties
Density: 1.188
Boiling point: 237 ºC
Refractive index: 1.45
Flash point: 206 ºF
Safety data
Danger class Code: R25 Toxic to swallow.
Safety instructions
If S45 has an accident or feels unwell, go to the doctor for help immediately (preferably with the product container label).
Dangerous goods Transport No. : UN 2810
Hereinafter referred to as: VEC
Appearance: colorless liquid
Purity: 99.5%
Packaging material PE
Packing weight 1kg/20kg
Uses: as a highly reactive film forming additive in lithium secondary batteries. VEC has high dielectric constant, high boiling point and flash point, which is beneficial to improve the safety performance of lithium ion battery. VEC begins to decompose at 1.35V, and can form a stable and dense SEI film on flake graphite, which effectively prevents PC and solvated lithium ion from co-embedding into the graphite layer, and inhibits the decomposition of electrolyte to a minimum, thus improving the charge and discharge efficiency and cycling characteristics of lithium ion battery. The chemical properties are stable. When a certain amount of VEC is added to the electrolyte at a suitable temperature, the cyclic performance of the cathode metal can be significantly improved. After several charge-discharge cycles, the retained discharge capacity can be increased from 68.8% to 84.8%. According to the test results, the addition of VEC can make the CO2 peak disappear in the second charge-discharge cycle and significantly reduce the amount of CO2 release. This indicates that both the Yin and Yang poles form stable SEI layers with the participation of VEC.
