Lithium ion battery electrolyte and application thereof
By introducing additives with specific structures into the lithium-ion battery electrolyte, the insufficient performance of the positive electrode active material in phosphate structure under fast charging and low temperature conditions is solved, and the battery's efficient fast charging, low-temperature discharge capacity is improved and the electrolyte preparation cost is reduced.
Patent Information
- Application Number
- CN202411895735.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-20
- Publication Date
- 2025-03-28
- Estimated Expiration
- 2044-12-20
AI Technical Summary
In practical applications, phosphate structure positive electrode active materials have problems such as low electron conductivity and low ion diffusion coefficient, resulting in limited fast charge rate performance and low temperature discharge capacity.
A lithium-ion battery electrolyte is used, and its composition includes a lithium salt, a solvent and a specific additive. The general structure of the specific additive is: wherein n1 and n2 are independently selected from any natural number in 0-5, X and Y are each independently selected from one of O, S, Se or Te, R1 and R2 are each selected from a combination of specific alkyl, alkenyl, alkynyl and other groups, and Z and Q are each independently selected from one of O, S, CH or CH2. This additive has the advantages of high dielectric constant, high lithium ion mobility coefficient, selective film formation, few high-temperature interface side reactions, low low-temperature viscosity and high electrochemical stability.
By using this electrolyte, the fast charge rate and low-temperature discharge capacity of the phosphate system are significantly improved, the amount of additives in the electrolyte is reduced, the preparation cost is saved, and the circulation performance and high-temperature storage performance of the battery are improved.