Sodium ion battery
By adding specific amounts of Structural Formula 1 compounds and sulfur-containing compounds to sodium-ion batteries and controlling the compaction density of the negative electrode material layer, a stable SEI film is formed, solving the problems of poor low-temperature performance and rate performance of sodium-ion batteries and achieving a significant improvement in battery performance.
CN122073248APending Publication Date: 2026-05-22SHENZHEN CAPCHEM TECH CO LTD +1
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Patent Information
- Application Number
- CN202411683054.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-22
- Publication Date
- 2026-05-22
AI Technical Summary
Technical Problem
Existing sodium-ion batteries suffer from poor low-temperature performance and rate performance, as well as high gas production, which limits their development and application.
Method used
By adding specific amounts of a compound of formula 1 and a sulfur-containing compound to a non-aqueous electrolyte and controlling the compaction density of the negative electrode material layer, a stable SEI film is formed, improving the low-temperature and rate performance of the battery.
Benefits of technology
It significantly improves the low-temperature and rate performance of sodium-ion batteries, reduces battery impedance and gas production, enhances the stability of electrodes and electrolytes, and improves the cycle stability of batteries.
✦ Generated by Eureka AI based on patent content.
Abstract
The invention relates to the technical field of electrochemistry, in particular to a sodium ion battery. The sodium ion battery comprises a positive electrode, a negative electrode and a non-aqueous electrolyte, the negative electrode comprises a negative electrode material layer, the non-aqueous electrolyte comprises a sodium salt, a solvent and an additive, the additive comprises a sulfur-containing compound and silane phosphate, and the silane phosphate is selected from a compound as shown in a structural formula 1; the sodium ion battery satisfies the following conditions: 0.2 < = (a + b) / c < = 3.5, 0.1 < = a < = 2, 0.1 < = b < = 1, and 0.85 < = c < = 1.15. By limiting the relationship among the content a of the compound as shown in the structural formula 1, the content b of the sulfur-containing compound and the compaction density c of the negative electrode material layer, the impedance of the battery can be effectively reduced, the gas production of the battery is reduced, and the low-temperature and rate performance of the sodium-ion battery is improved.
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