Positive electrode active material for lithium secondary batteries, electrodes for lithium secondary batteries, and lithium secondary batteries

The positive electrode active material with optimized element ratios on the surface and inside the secondary particles addresses high resistance and capacity loss in lithium secondary batteries, enhancing lithium ion conductivity and discharge capacity.

JP7875443B2Active Publication Date: 2026-06-18TOYOTA JIDOSHA KK
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Patent Information

Authority / Receiving Office
JP · JP
Patent Type
Patents
Current Assignee / Owner
TOYOTA JIDOSHA KK
Filing Date
2022-09-07
Publication Date
2026-06-18

AI Technical Summary

⚠Technical Problem

Conventional positive electrode active materials for lithium secondary batteries suffer from high lithium-ion conduction resistance and decreased charge/discharge capacity due to surface reaction-inhibiting portions, leading to side reactions that degrade battery performance.

⚗Method used

A positive electrode active material with a layered structure composed of secondary particles, containing specific ratios of elements M1 (Nb, W, Mo, Ta, La, B, or P) and M2 (Ni, Co, Mn) on the surface and inside, optimized by X-ray photoelectron spectroscopy (XPS) to enhance lithium ion conductivity and discharge capacity.

🎯Benefits of technology

The material enables smooth lithium ion movement and high discharge capacity by balancing surface and internal element concentrations, reducing resistance and side reactions.

✦ Generated by Eureka AI based on patent content.

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Abstract

To provide a positive electrode active material for a lithium secondary battery with high discharge capacity.SOLUTION: A positive electrode active material for a lithium secondary battery having a layered structure containing secondary particles that are aggregates of primary particles includes an element M1 and an element M2, the element M1 is at least one element selected from the group consisting of Nb, W, Mo, Ta, La, B and P, and the element M2 is at least one element M2 selected from the group consisting of Ni, Co, and Mn, and (1) and (2) are satisfied.SELECTED DRAWING: None
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