Ether electrolyte additive and application in sodium ion battery
By using a combination of sodium salt, ether solvent and specific additives in sodium ion batteries, the problem of insufficient efficiency and low-temperature performance of ether electrolyte in sodium ion batteries is solved, and a higher battery performance and application range is achieved.
CN119725728AActive Publication Date: 2025-03-28DALIAN INSTITUTE OF CHEMICAL PHYSICS CHINESE ACADEMY OF SCIENCES
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Patent Information
- Application Number
- CN202311261795.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2023-09-27
- Publication Date
- 2025-03-28
- Estimated Expiration
- 2043-09-27
AI Technical Summary
Technical Problem
Ether electrolytes have low first-circle Coulomb efficiency and low temperature performance in sodium ion batteries, which limits its application range.
Method used
An additive to a sodium ion battery electrolyte is used, including sodium salts, ether solvents and specific additives, such as methyltriphenylphosphine bromide, to improve the electrochemical performance on the negative electrode side.
Benefits of technology
The efficiency and capacity of the first circle of the negative electrode side are significantly improved, and the low-temperature sodium storage kinetics of the electrolyte are accelerated, thereby improving the overall performance and use range of the battery.
✦ Generated by Eureka AI based on patent content.
Abstract
According to the ether electrolyte additive disclosed by the invention, a certain amount of additive is added into a common ether electrolyte, the first-circle coulombic efficiency of a negative electrode side can be efficiently improved, and meanwhile, the low-temperature sodium storage kinetics of the electrolyte can be accelerated, so that the battery capacity and the low-temperature performance are improved, and the application range of the battery is expanded; the application of the ether electrolyte (EBEs) in the field of sodium-ion batteries is gradually increased, and particularly, the ether electrolyte has outstanding advantages in the aspect of improving the performance of the negative electrode side. Compared with an ester electrolyte, the stable solvation structure can realize highly reversible solvent-co-intercalation reaction and form thin and stable SEI (solid electrolyte interface), so that stable circulation of a negative electrode and rapid sodium storage kinetics are facilitated. However, the relatively low first-circle coulombic efficiency and low-temperature performance still need to be further researched.
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