Positive electrode active material for nonaqueous electrolyte secondary batteries, and nonaqueous electrolyte secondary battery

Patent metadata

Field	Value
Publication number	US-2023123331-A1
Application number	US-202117794782-A
Country	US
Kind code	A1
Filing date	Jan 19, 2021
Priority date	Jan 31, 2020
Publication date	Apr 20, 2023
Grant date	—

Abstract

This positive electrode active material comprises an Ni-containing lithium composite oxide A and an Ni-containing lithium composite oxide B. Each of the Ni-containing lithium composite oxide A and the Ni-containing lithium composite oxide B contains 50% by mole or more of Ni relative to the total number of moles of the metal elements excluding Li; the Ni-containing lithium composite oxide A has an average primary particle diameter of 2 μm or more, an average secondary particle diameter of from 2 μm to 6 μm, and a particle breaking load of 5 mN or more; and the Ni-containing lithium composite oxide B has an average primary particle diameter of 1 μm or less, an average secondary particle diameter of from 10 μm to 20 μm, and a particle breaking load of 20 mN or more, while having a coating layer on the surface of each primary particle.

First claim

1 . A positive electrode active material for non-aqueous electrolyte secondary batteries, including:
a Ni-containing lithium composite oxide A; and a Ni-containing lithium composite oxide B, wherein the Ni-containing lithium composite oxide A and the Ni-containing lithium composite oxide B include 50 mol % or more of Ni with respect to a total number of mole of metal elements excluding Li, the Ni-containing lithium composite oxide A has an average primary particle size of 2 μm or larger, an average secondary particle size of 2 μm to 6 μm, and a load at particle fracture of 5 mN or larger, and the Ni-containing lithium composite oxide B has an average primary particle size of 1 μm or smaller, an average secondary particle size of 10 μm to 20 μm, and a load at particle fracture of 20 mN or larger, and has a coating layer on a surface of the primary particle.

2 . The positive electrode active material for non-aqueous electrolyte secondary batteries according to claim 1 , wherein
the coating layer includes at least one or more elements selected from B, Al and Ti.

3 . The positive electrode active material for non-aqueous electrolyte secondary batteries according to claim 1 , wherein
the Ni-containing lithium composite oxide A and the Ni-containing lithium composite oxide B each include at least one of Co and Mn, and includes at least one metal element selected from Mg, Zr, Mo, W, Nb, Al, Cr, V, Ce, Ti, Fe, Si, K, Ga, In and B.

4 . The positive electrode active material for non-aqueous electrolyte secondary batteries according to claim 1 , wherein
the Ni-containing lithium composite oxide A and the Ni-containing lithium composite oxide B include 80 mol % or more of Ni.

5 . A non-aqueous electrolyte secondary battery, comprising:
a positive electrode including a positive electrode active material for non-aqueous electrolyte secondary batteries according to claim 1 ; a negative electrode; and a non-aqueous electrolyte.

Assignees

• Sanyo Electric Co

Inventors

• Watanabe Hiroki
• Hiratsuka Hidekazu

Classifications

• Y02P70/50

  Manufacturing or production processes characterised by the final manufactured product · CPC title

• H01M50/107

  having curved cross-section, e.g. round or elliptic (H01M50/103, H01M50/109, H01M50/11 take precedence) · CPC title

• H01M4/525 Primary

  of mixed oxides or hydroxides containing iron, cobalt or nickel for inserting or intercalating light metals, e.g. LiNiO2, LiCoO2 or LiCoOxFy · CPC title

• H01M2004/028

  Positive electrodes · CPC title

• H01M4/131

  Electrodes based on mixed oxides or hydroxides, or on mixtures of oxides or hydroxides, e.g. LiCoOx · CPC title