4-Vinyl-1,3-dioxolan-2-one(VEC) CAS 4427-96-7

Introduction

4-Vinyl-1,3-dioxolan-2-one(VEC) is one of the important additives in the current electrolyte industry and has a key impact on battery performance optimization.

Product Specifications

Application 

As a highly reactive film-forming additive in lithium secondary batteries. VEC has a high dielectric constant, high boiling point and flash point, which is beneficial to improving 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 being co-embedded in the graphite interlayer, suppressing the decomposition of the electrolyte to a minimum, thereby improving the charge and discharge efficiency and cycle characteristics of lithium-ion batteries. It has stable chemical properties. When a certain amount of VEC is added to the electrolyte at a suitable temperature, it will significantly improve the cycle performance of the cathode metal. After multiple charge and 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 during the second charge and discharge cycle, and significantly reduce the amount of CO2 released. This shows that both the positive and negative poles have formed a stable SEI layer with the participation of VEC.