Secondary batteries

JP2026115979A5Pending Publication Date: 2026-08-21MURATA MFG CO LTD
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Patent Information

Application Number
JP2024233067
Authority / Receiving Office
JP · JP
Patent Type
Applications
Current Assignee / Owner
Filing Date
2024-12-27
Publication Date
2026-08-21

AI Technical Summary

Technical Problem

The charge-discharge characteristics of secondary batteries deteriorate due to the electrolytic solution.

Method used

A secondary battery design comprising a positive electrode with an aluminum current collector and a positive electrode active material layer containing a lithium-containing compound, an electrolyte with bis(fluorosulfonyl)imide salt, solvent mixtures of ethylene carbonate, propylene carbonate, fluoroethylene carbonate, and gamma butyrolactone, and additives such as lithium fluorophosphate, sulfinyl compounds, and dinitrile compounds, with a specific intrinsic molar ratio of solvent to lithium ions.

Benefits of technology

Improves charge and discharge characteristics, especially in high-temperature environments, by suppressing electrolyte decomposition and maintaining ionic conductivity.

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Abstract

To improve charge and discharge characteristics. [Solution] The secondary battery comprises a positive electrode, a negative electrode, and an electrolyte. The positive electrode comprises a positive electrode current collector containing aluminum and a positive electrode active material layer provided on the positive electrode current collector. The positive electrode active material layer contains a lithium-containing compound. The electrolyte comprises an electrolyte, a solvent, and an additive. The electrolyte contains a bis(fluorosulfonyl)imide salt. The solvent contains at least one from the first group consisting of ethylene carbonate, propylene carbonate, fluoroethylene carbonate, dimethyl carbonate, and gamma butyrolactone. The additive contains at least one from lithium fluorophosphate, sulfinyl compounds, and dinitrile compounds. The intrinsic molar ratio of the solvent to lithium ions, calculated from the vibrational spectroscopy spectrum of the electrolyte, is greater than 0 and 1.78 or less.
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