| abstract |
The invention relates to an electrolyte and an electrochemical device, which relate to the technical field of energy accumulating materials. The electrolyte contains an additive A, an additive B, and an additive C. The additive A is at least one compound selected from the heterocyclic compounds of hexahydric nitrogen polynitrile represented by the formula I-1, the formula I-2 or Formula I-3, additive B is at least one compound selected from sulfonate compounds, and additive C is at least one selected from halogen-substituted cyclic carbonate compounds. The electrochemical device contains the electrolyte. The electrolyte can effectively passivate the surface activity of a positive electrode material, can inhibit the oxidation effect of the positive electrode material on the electrolyte, can effectively reduce the production of gas from a battery , and can also be adsorbed to catalytically active spots on the graphite surface to form a more stable SEI film, significantly reducing the appearance of side effects. The electrochemical device using the electrolyte has excellent cyclic performance at high temperature and high voltage and excellent energy storage performance. |