POSITIVE ELECTRODE ACTIVE MATERIAL FOR ALL-SOLID-STATE LITHIUM-ION SECONDARY BATTERY, AND METHOD FOR PRODUCING SAME

Title:

POSITIVE ELECTRODE ACTIVE MATERIAL FOR ALL-SOLID-STATE LITHIUM-ION SECONDARY BATTERY, AND METHOD FOR PRODUCING SAME

Document Type and Number:

WIPO Patent Application WO/2023/228959

Kind Code:

A1

Abstract:

The purpose of the present invention is to provide a positive electrode active material that exhibits a higher battery capacity in use as a positive electrode active material in an all-solid-state battery.　The positive electrode active material for an all-solid-state lithium-ion secondary battery comprises lithium nickel composite oxide particles and a coating layer that coats the surface of the particles. The lithium nickel composite oxide particles have a crystal structure belonging to a space group R-3m, and contain at least Li, Ni, Mn, and an element M, wherein a substance amount ratio for the individual elements is given by Li : Ni : Mn : M : Nb = a : (1-x-y-z) : x : y : z (0.95 ≦ a ≦ 1.10, 0 < x ≦ 0.5, 0 < y ≦ 0.5, 0 < z < 0.05, 0 < x + y + z ≦ 0.7). The Li site occupancy rate is 92-98.5%, D50 is 8 µm or less, and the amount of eluted lithium ions is 0.20-1.00 mass% in relation to the total amount of the lithium nickel composite oxide particles. The coating layer is a composite oxide that contains Li and at least one element selected from the group consisting of Al, Si, Ti, V, Ga, Ge, Zr, Nb, Mo, Ta, and W.

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Inventors:

TOUMA MIKAKO (JP)
HAYASHI KAZUHIDE (JP)

Application Number:

PCT/JP2023/019224

Publication Date:

November 30, 2023

Filing Date:

May 23, 2023

Export Citation:

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Assignee:

SUMITOMO METAL MINING CO (JP)

International Classes:

H01M4/525; C01G53/00; H01M4/36; H01M4/505

Domestic Patent References:

WO2022025212A1	2022-02-03
WO2021054468A1	2021-03-25

Foreign References:

JP2021051880A	2021-04-01
JP2008153017A	2008-07-03

Attorney, Agent or Firm:

USAMI, Aya et al. (JP)

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