Positive electrode active material for lithium-ion batteries, positive electrode for lithium-ion batteries, lithium-ion batteries, positive electrode active material for all-solid-state lithium-ion batteries, positive electrode for all-solid-state lithium-ion batteries, all-solid-state lithium-ion batteries, method for manufacturing positive electrode active material for lithium-ion batteries, and method for manufacturing positive electrode active material for all-solid-state lithium-ion batteries

The positive electrode active material with tailored Ta distribution and a Li-Nb oxide coating addresses the challenge of inconsistent concentration variation, enhancing lithium-ion battery performance.

JP7870371B1Active Publication Date: 2026-06-04JX NIPPON MINING & METALS CORP
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Patent Information

Application Number
JP2025009372
Authority / Receiving Office
JP · JP
Patent Type
Patents
Current Assignee / Owner
Filing Date
2025-01-22
Publication Date
2026-06-04
Estimated Expiration
2045-01-22

AI Technical Summary

Technical Problem

Conventional methods for producing positive electrode active materials for lithium-ion batteries struggle to control the concentration variation of added elements between grain boundaries and grain interiors, leading to inconsistent battery characteristics and potential deterioration.

Method used

A positive electrode active material with a specific composition (Li a Ni b Co c Mn d Ta e O f ) is developed, where the concentration of Ta is higher at grain boundaries than within primary particles, and a coating layer of Li and Nb oxide is applied, enhancing battery characteristics such as discharge capacity and rate characteristics.

Benefits of technology

The solution improves battery characteristics by segregating Ta at grain boundaries, reducing crystal lattice expansion, and optimizing the concentration variation, resulting in enhanced cycle and rate performance.

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Abstract

Provided are a cathode active material for a lithium-ion battery having good battery characteristics, a cathode, a battery, and a method for manufacturing the cathode active material. 【Solution means】 A cathode active material represented by the composition shown in the following formula (1), Li a Ni b Co c Mn d Ta e O f (1) (In formula (1), 1.0 ≤ a ≤ 1.07, 0.8 ≤ b ≤ 0.9, b + c + d + e = 1, 1.8 ≤ f ≤ 2.2, 0.001 ≤ e / (b + c + d + e) ≤ 0.005.) Regarding the magnitudes of the coefficient of variation CV1, which is the value obtained by dividing the standard deviation of the average Ta element concentration inside the primary particles by the average Ta element concentration obtained by TEM-EDX analysis, and the coefficient of variation CV2, which is the value obtained by dividing the standard deviation of the average Ta element concentration at the grain boundaries of the primary particles by the average Ta element concentration at the grain boundaries of the primary particles, CV2 > CV1, and the average Ta element concentration at the grain boundaries obtained by TEM-EDX analysis is higher than the Ta element concentration of the cathode active material for a lithium-ion battery analyzed by ICP, a cathode active material for a lithium-ion battery.
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