Non-aqueous electrolyte secondary battery

By using a positive electrode active material with specific particle size and absorption characteristics, the non-uniformity and high resistance issues in thick electrodes are addressed, improving ion diffusion and reaction uniformity for better battery performance.

JP2026113716APending Publication Date: 2026-07-07TOYOTA JIDOSHA KK
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Patent Information

Authority / Receiving Office
JP · JP
Patent Type
Applications
Current Assignee / Owner
TOYOTA JIDOSHA KK
Filing Date
2026-04-15
Publication Date
2026-07-07

AI Technical Summary

Technical Problem

Increasing electrode thickness in non-aqueous electrolyte secondary batteries leads to reduced input/output characteristics and cycle performance due to non-uniform reactions in the thickness direction, indicated by high ionic resistance.

Method used

Incorporating a positive electrode active material with a layered structure, secondary particles larger than 8.0 μm, a DBP oil absorption ratio of 0.3 or more to BET specific surface area, and a thickness of 80 μm or more for the positive electrode active material layer to enhance electrolyte retention and ion diffusion.

Benefits of technology

The solution improves ion diffusion and reaction uniformity within the electrode, reducing ionic resistance and maintaining capacity retention, thereby enhancing battery performance.

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Abstract

To suppress the increase in ionic resistance. [Solution] A non-aqueous electrolyte secondary battery comprising a positive electrode, a negative electrode, and a separator, wherein the positive electrode comprises a positive electrode active material layer, the positive electrode active material layer comprises a layered positive electrode active material, the positive electrode active material forms secondary particles, the average particle size of the secondary particles is 8.0 μm or more, and the ratio of the DBP oil absorption amount of the secondary particles to the BET specific surface area of ​​the secondary particles is 0.3 or more.
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