Sodium-ion secondary battery
The sodium-ion secondary battery design with a tailored non-aqueous electrolyte composition addresses gas generation and cycle issues, enhancing performance by using cyclic carbonate and ether in a specific ratio, thereby improving cycle characteristics.
WO2026116070A1PCT designated stage Publication Date: 2026-06-04PANASONIC INTELLECTUAL PROPERTY MANAGEMENT CO LTD
Patent Information
- Authority / Receiving Office
- WO · WO
- Patent Type
- Applications
- Current Assignee / Owner
- PANASONIC INTELLECTUAL PROPERTY MANAGEMENT CO LTD
- Filing Date
- 2025-11-10
- Publication Date
- 2026-06-04
AI Technical Summary
Technical Problem
Sodium-ion rechargeable batteries suffer from poor cycle characteristics and low energy density, with gas generation during charging and discharging being a significant issue.
Method used
A sodium-ion secondary battery design incorporating a non-aqueous electrolyte with a specific ratio of cyclic carbonate to sodium salt, combined with ether and optionally a diluent, to suppress gas generation and enhance cycle characteristics.
Benefits of technology
The battery effectively reduces gas generation during charging and discharging while maintaining or improving cycle characteristics, achieving performance comparable to or better than batteries using mixed solvents of cyclic carbonate and chain carbonate.
✦ Generated by Eureka AI based on patent content.
Smart Images
Figure JP2025039372_04062026_PF_FP_ABST
Abstract
A sodium-ion secondary battery 100 according to the present disclosure is provided with: a positive electrode 5 that contains a positive electrode active material capable of occluding and releasing sodium ions; a negative electrode 6 that contains a negative electrode active material capable of occluding and releasing sodium ions; and a nonaqueous electrolytic solution that contains a sodium salt, an ether, and a cyclic carbonate. In the nonaqueous electrolytic solution, the ratio of the substance amount of the cyclic carbonate to the substance amount of the sodium salt is 0.1-1.8.
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