Positive electrode active material particle powder for non-aqueous electrolyte secondary battery, method for producing same, and non-aqueous electrolyte secondary battery

• US 11,127,940 B2
• Filed: 12/12/2019
• Issued: 09/21/2021
• Est. Priority Date: 11/20/2014
• Status: Active Grant

• Current Assignee: TODA Kogyo Corporation
• Original Assignee: TODA Kogyo Corporation
• Inventors: Koga, Kazumichi, Masukuni, Hiroaki, Matsumoto, Kazutoshi
• Primary Examiner(s): Siddiquee, Muhammad S
• Application Number:
  US16/712,161
• Publication Number:
  US 20200119332A1
• Time in Patent Office: 649 Days
• CPC Class Codes: C01G 45/1242 of the type [Mn2O4]-, e.g. LiMn2O4, Li[MxMn2-x]O4
• CPC Class Codes: C01P 2002/32 spinel-type (AB2O4)
• CPC Class Codes: C01P 2002/72 by d-values or two theta-values, e.g. as X-ray diagram
• CPC Class Codes: C01P 2004/03 obtained by SEM
• CPC Class Codes: C01P 2004/41 octahedron-like
• CPC Class Codes: C01P 2004/61 Micrometer sized, i.e. from 1-100 micrometer
• CPC Class Codes: C01P 2006/12 Surface area
• CPC Class Codes: H01M 10/0525 Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
• CPC Class Codes: H01M 2004/028 Positive electrodes
• CPC Class Codes: H01M 4/0471 involving thermal treatment, e.g. firing, sintering, backing particulate active material, thermal decomposition, pyrolysis
• CPC Class Codes: H01M 4/131 Electrodes based on mixed oxides or hydroxides, or on mixtures of oxides or hydroxides, e.g. LiCoOx
• CPC Class Codes: H01M 4/1391 of electrodes based on mixed oxides or hydroxides, or on mixtures of oxides or hydroxides, e.g. LiCoOx
• CPC Class Codes: H01M 4/505 of mixed oxides or hydroxides containing manganese for inserting or intercalating light metals, e.g. LiMn2O4 or LiMn2OxFy
• CPC Class Codes: Y02E 60/10 Energy storage using batteries

Abstract

Positive electrode active material particle powder includes lithium manganese oxide particle powder having Li and Mn as main components and a cubic spinel structure with an Fd-3m space group. The lithium manganese oxide particle powder is composed of secondary particles, which are aggregates of primary particles, an average particle diameter (D50) of the secondary particles being from 4 μm to 20 μm, and at least 80% of the primary particles exposed on surfaces of the secondary particles each have a polyhedral shape in which each (111) plane thereof is adjacent to at least one (100) plane thereof.

Claims

1. A method of producing positive electrode active material particle powder for a non-aqueous electrolyte secondary battery, the method comprising:

mixing trimanganese tetroxide, a lithium compound, and a niobium compound or a molybdenum compound as a crystal plane growth suppressor to form a mixture; and

firing the mixture in an oxidizing atmosphere at a temperature from 700°

C. to 950°

C.,

wherein in X-ray diffraction analysis of the positive electrode active material particle powder, a cubic spinel phase composed of Li and Mn, and a phase of a compound of Nb and Li, or Mo and Li are present.

2. The method of claim 1, wherein

the trimanganese tetroxide is composed of secondary particles, which are aggregates of primary particles, an average particle diameter (D50) of the secondary particles being from 3 μ

m to 20 μ

m, and crystallite size of the primary particles being from 50 nm to 150 nm.

3. The method of claim 1, wherein

an amount of the crystal plane growth suppressor is from 0.3 mol % to 0.6 mol %.

4. The method of claim 1, wherein

the positive electrode active material particle powder for a non-aqueous electrolyte secondary battery is a lithium manganate particle powder.

5. The method of claim 1, wherein

in the mixing, the niobium compound or the molybdenum compound as the crystal plane growth suppressor reduces a ratio of a growth rate of planes other than a (111) plane to a growth rate of the (111) plane of lithium manganate particles having a cubic spinel structure.

6. The method of claim 1, wherein

the positive electrode active material particle powder comprises a lithium manganese oxide particle powder having Li and Mn and a cubic spinel structure with an Fd-3m space group.