Electrolyte and sodium-ion battery containing the electrolyte

CN116207350BActive Publication Date: 2026-05-26ZHUHAI SMOOTHWAY ELECTRONICS MATERIALS
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Patent Information

Application Number
CN202310410757.7
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2023-04-18
Publication Date
2026-05-26
Estimated Expiration
2043-04-18

AI Technical Summary

Technical Problem

Existing sodium-ion batteries have low energy density, and high-voltage or high-theoretical-capacity cathode materials are prone to causing transition metal ions to dissolve, damaging the SEI film and affecting cycle and high-temperature storage performance.

Method used

An electrolyte containing sodium acesulfame potassium and acid anhydride compounds is used to form a stable SEI interface film. Sodium acesulfame potassium forms a tough film during the first charge and discharge stage, while acid anhydride compounds form a dense SEI film at the negative electrode, which alleviates side reactions and improves battery performance.

Benefits of technology

The first coulombic efficiency, high-temperature storage performance, and cycle performance of sodium-ion batteries under high voltage are significantly improved through the synergistic effect of two additives.

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Abstract

This invention provides an electrolyte and a sodium-ion battery. The electrolyte comprises a sodium salt, a non-aqueous organic solvent, and additives. The additives include: (a) sodium acesulfame potassium, with the structural formula shown in Formula 1; and (b) an acid anhydride compounds. The electrolyte comprises sodium acesulfame potassium and an acid anhydride compounds. Sodium acesulfame potassium can form a tough, shatter-resistant, and high-temperature resistant interfacial film during the first charge-discharge stage of the battery. However, this interfacial film contains sulfur and nitrogen elements, which easily dissolve in the electrolyte, consuming some of the active sodium to form a new interfacial film, causing gas production and a decrease in the initial coulombic efficiency of the battery. The acid anhydride compounds, due to their high film-forming potential, easily form a dense interfacial film at the negative electrode, effectively mitigating the side reactions of sodium acesulfame potassium in the electrolyte after film formation. Using this electrolyte in a sodium-ion battery can improve the initial coulombic efficiency, high-temperature storage performance, and cycle performance of the sodium-ion battery under high voltage.
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Citation Information

Patent Citations

  • Sodium ion battery electrolyte and sodium ion battery

    CN107171021A

  • Battery, battery pack, electronic device, electric vehicle, power storage device and power system

    CN108140890A

  • Acesulfamic acid salt, preparation method thereof and application of acesulfamic acid salt in non-aqueous electrolyte

    CN114436992A