Secondary battery

JPWO2025070577A1Pending Publication Date: 2025-04-03
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Patent Information

Application Number
JP2025549073
Authority / Receiving Office
JP · JP
Patent Type
Applications
Priority Date
2023-09-28
Filing Date
2024-09-26
Publication Date
2025-04-03

AI Technical Summary

Technical Problem

Existing secondary batteries using silicon-containing materials for negative electrodes face challenges in maintaining high cycle maintenance rates due to the large expansion and shrinkage rates of silicon-containing materials, which can lead to cracking and reduced electrolyte retention.

Method used

A secondary battery design that incorporates a negative electrode active material comprising a silicon-containing material with a single-particle breaking strength between 50 MPa and 350 MPa, and a graphite material, where the ratio of their single-particle breaking strengths is between 2.5 and 60, optimizing the hardness and electrolyte retention.

Benefits of technology

This configuration achieves a high capacity retention rate during charge and discharge cycles, suppressing the decrease in cycle maintenance rate and improving load characteristics by maintaining sufficient electrolyte within the negative electrode.

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Abstract

This secondary battery comprises a positive electrode, a negative electrode, and an electrolyte, the negative electrode including a negative electrode active material, the negative electrode active material including a silicon-containing material and a graphite material, the single-particle fracture strength of the silicon-containing material being within a range of not less than 50 MPa but less than 350 MPa, and the ratio Ss / Sg of the single-particle fracture strength Ss of the silicon-containing material to the single-particle fracture strength Sg of the graphite material being within a range of not less than 2.5 but less than 60.
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