Electrolyte, electrochemical device comprising same and vehicle

• Main Author: YANG CHUANJING
• Format: Patent
• Language: Chinese; English
• Published: 07.06.2024
• Subjects: BASIC ELECTRIC ELEMENTS; ELECTRIC EQUIPMENT OR PROPULSION OF ELECTRICALLY-PROPELLEDVEHICLES; ELECTRICITY; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES, IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; PERFORMING OPERATIONS; PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSIONOF CHEMICAL INTO ELECTRICAL ENERGY; TRANSPORTING; VEHICLES IN GENERAL

The invention relates to an electrolyte, and an electrochemical device and a vehicle comprising the same. The electrolyte comprises unsaturated phosphate and unsaturated silazane. Unsaturated phosphate and unsaturated silazane are synchronously introduced into the electrolyte, so that a stable CEI film can be formed on the surface of a positive electrode, the HF content in the battery can be reduced, damage of HF to the positive electrode and the CEI film is reduced, interface protection on the positive electrode can be improved through the synergistic effect of the unsaturated phosphate and the unsaturated silazane, and the high-temperature storage performance of the lithium ion battery applying the electrolyte is remarkably improved; and the preparation process is simple and feasible and is suitable for large-scale production. 本公开涉及一种电解液及包含其的电化学装置、车辆，所述电解液的组成成分包括不饱和磷酸酯和不饱和硅氮烷。在电解液中同步引入不饱和磷酸酯和不饱和硅氮烷，既可以在正极表面形成稳定CEI膜，又可以降低电池中HF含量，从而降低HF对正极及CEI膜的破坏，二者协同作用可以提升对正极的界面保护，从而显著提升应用其的锂离子电池的高温存储性能，并且制作过程简单易行，适合大规模生产。