Nonaqueous electrolyte and nonaqueous electrolyte secondary battery

By blending specific carbonate, nitrile, and cyclic sulfate ester compounds with silicon particles in the electrolyte, the battery swelling issue is mitigated, enhancing the battery's structural stability and performance.

JP2025154470APending Publication Date: 2025-10-10MITSUI CHEMICALS INC
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Patent Information

Application Number
JP2024057493
Authority / Receiving Office
JP · JP
Patent Type
Applications
Current Assignee / Owner
Filing Date
2024-03-29
Publication Date
2025-10-10

AI Technical Summary

Technical Problem

Lithium-ion secondary batteries experience swelling due to gas generation, which is a critical issue that existing technologies have not adequately addressed.

Method used

Incorporating specific carbonate, nitrile, and cyclic sulfate ester compounds into a non-aqueous electrolyte solution, along with silicon particles or silicon oxide particles as a negative electrode active material, to reduce battery swelling.

Benefits of technology

The solution effectively reduces battery swelling by enhancing the electrolyte's ability to manage gas generation, thereby improving the battery's structural integrity and performance.

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Abstract

To provide a nonaqueous electrolyte and a nonaqueous electrolyte secondary battery that are capable of reducing battery swelling caused by gas generation.SOLUTION: A nonaqueous electrolyte comprises: at least one carbonate compound selected from the group consisting of compounds represented by formula (I-1) in the figure and compounds represented by formula (I-2) in the figure; a nitrile compound represented by formula (II) in the figure; and a cyclic sulfate compound represented by formula (III) in the figure. Definitions of the groups in each formula are as described in the specification.SELECTED DRAWING: None
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Citation Information

Patent Citations

  • Boron phosphate lithium compound, additive for lithium secondary battery, non-aqueous electrolyte for lithium secondary battery, lithium secondary battery precursor, manufacturing method of lithium secondary battery, and lithium secondary battery

    JP2020147487A