Positive electrode active material for lithium-ion secondary batteries, lithium-ion secondary batteries

A lithium nickel composite oxide-based positive electrode active material with controlled molar ratios and surface content ratios addresses reaction resistance in lithium-ion secondary batteries, improving battery performance by forming low-resistance reaction products.

JP7868483B2Active Publication Date: 2026-06-02SUMITOMO METAL MINING CO LTD
View PDF 9 Cites 0 Cited by

Patent Information

Authority / Receiving Office
JP · JP
Patent Type
Patents
Current Assignee / Owner
SUMITOMO METAL MINING CO LTD
Filing Date
2022-10-31
Publication Date
2026-06-02

AI Technical Summary

Technical Problem

There is a growing demand for positive electrode active materials in lithium-ion secondary batteries that can reduce reaction resistance.

Method used

A positive electrode active material for lithium-ion secondary batteries is developed, comprising lithium nickel composite oxide with a hexagonal layered structure, containing lithium, nickel, boron, and element M, with specific molar ratios and surface content ratios of boron to carbon, to minimize reaction resistance.

Benefits of technology

The proposed material effectively reduces reaction resistance in lithium-ion secondary batteries by forming low-resistance reaction products with lithium, thereby enhancing battery performance.

✦ Generated by Eureka AI based on patent content.

Smart Images

  • Figure 0007868483000002
    Figure 0007868483000002
  • Figure 0007868483000003
    Figure 0007868483000003
  • Figure 0007868483000001
    Figure 0007868483000001
Patent Text Reader

Abstract

To provide a positive electrode active material for a lithium ion secondary battery, in which the reaction resistance can be reduced when used for a lithium ion secondary battery.SOLUTION: A positive electrode active material for a lithium ion secondary battery has a hexagonal crystal layer structure and contains a lithium nickel complex oxide including a secondary particle in which a plurality of primary particles are aggregated. The lithium nickel complex oxide contains Li, Ni, B, and an element M (M) in the following ratio of the amount of substance: Li:Ni:B:M=a:b:c:d (0.95≤a≤1.10, 0.50≤b<1.00, 0.00<c≤0.03, 0.00≤d≤0.47, b+c+d=1, and the element M is at least one kind of element selected from the group consisting of Mn, Co, V, Mg, Mo, Ca, Cr, Zr, Ta, Ti, Nb, Na, W, Fe, Zn, Si, Sn, Cu, P, and Al). The ratio of the B content to the C content calculated from the XPS measurement result is 0.8 or more and 30.0 or less.SELECTED DRAWING: None
Need to check novelty before this filing date? Find Prior Art