Lithium metal composite oxide powder, positive electrode active material for lithium secondary batteries, positive electrode, and lithium secondary battery

Patent metadata

Field	Value
Publication number	US-2022199982-A1
Application number	US-202017601854-A
Country	US
Kind code	A1
Filing date	Feb 26, 2020
Priority date	Apr 12, 2019
Publication date	Jun 23, 2022
Grant date	—

Abstract

A lithium metal composite oxide powder has a layered structure, and includes at least Li, Ni, an element X, and an element M. The element X is at least one element selected from the group consisting of Co, Mn, Fe, Cu, Ti, Mg, Al, W, Mo, Nb, Zn, Sn, Zr, Ga and V. The element M is at least one element selected from the group consisting of B, Si, S and P. A molar ratio of Ni to a sum of Ni and the element X, Ni/(Ni+X), is 0.40 or more. A molar ratio of the element M to a sum of Ni and the element X, M/(Ni+X), is more than 0 and 0.05 or less. The lithium metal composite oxide powder has core particles and coatings. The coatings include the element M at a concentration of more than 0.0185 mol/cm 3 and 0.070 mol/cm 3 or less.

First claim

1 . A lithium metal composite oxide powder, which has a layered structure, and comprises at least Li, Ni, an element X, and an element M, wherein:
the element X is at least one element selected from the group consisting of Co, Mn, Fe, Cu, Ti, Mg, Al, W, Mo, Nb, Zn, Sn, Zr, Ga and V, and the element M is at least one element selected from the group consisting of B, Si, S and P; a molar ratio of Ni to a sum of Ni and the element X, Ni/(Ni+X), is 0.40 or more; a molar ratio of the element M to a sum of Ni and the element X, M/(Ni+X), is more than 0 and 0.05 or less; and the lithium metal composite oxide powder has core particles and coatings formed thereon, the coatings comprising the element M at a concentration of more than 0.0185 mol/cm 3 and 0.070 mol/cm 3 or less.

2 . The lithium metal composite oxide powder according to claim 1 , which has a BET specific surface area of 2 m 2 /g or less.

3 . The lithium metal composite oxide powder according to claim 1 , wherein the coatings comprise a boron-containing compound.

4 . The lithium metal composite oxide powder according to claim 1 , which satisfies composition formula (I) below:
Li[Li m (Ni (1-n-p) X n M p ) 1-m ]O 2   (I)

wherein −0.1≤m≤0.2, 0<n≤0.6, 0<p≤0.05, and n+p<0.6.

5 . The lithium metal composite oxide powder according to claim 4 , wherein m in the composition formula (I) satisfies: 0<m≤0.2.

6 . The lithium metal composite oxide powder according to claim 1 , which has an average primary particle diameter of 1 μm or more and 7 μm or less.

7 . The lithium metal composite oxide powder according to claim 1 , wherein the coatings have an amorphous structure.

8 . A positive electrode active material for a lithium secondary battery, comprising the lithium metal composite oxide powder of claim 1 .

9 . A positive electrode comprising the positive electrode active material of claim 8 .

10 . A lithium secondary battery comprising the positive electrode of claim 9 .

Assignees

• Sumitomo Chemical Co

Inventors

• Kuroda Tomoya
• Takamori Kenji

Classifications

• C01G53/42

  containing alkali metals, e.g. LiNiO2 · CPC title

• C01P2002/85

  by XPS, EDX or EDAX data · CPC title

• C01P2004/61

  Micrometer sized, i.e. from 1-100 micrometer · CPC title

• H01M2004/028

  Positive electrodes · CPC title

• C01P2006/12

  Surface area · CPC title