Positive electrode material for nonaqueous electrolyte secondary battery and manufacturing method thereof

Patent metadata

Field	Value
Publication number	US-10720639-B2
Application number	US-201615226282-A
Country	US
Kind code	B2
Filing date	Aug 2, 2016
Priority date	Aug 7, 2015
Publication date	Jul 21, 2020
Grant date	Jul 21, 2020

Abstract

Provided is a positive electrode material for a nonaqueous electrolyte secondary battery that excels in thermal stability. A positive electrode material for a nonaqueous electrolyte secondary battery, which is provided by the present invention, includes positive electrode active material particles that can reversibly store and release a charge carrier, and a metal hydroxide. Each of the positive electrode active material particles has inside thereof a void and the metal hydroxide is disposed inside the void.

First claim

What is claimed is:

1. A positive electrode material for use in a nonaqueous electrolyte secondary battery, the positive electrode material comprising:
positive electrode active material particles that can reversibly store and release a charge carrier; and
a metal hydroxide, wherein
each of the positive electrode active material particles has inside thereof a void,
the positive electrode active material particles are particles of a lithium transition metal oxide including lithium (Li) and a transition meta (Me) as constituent metal elements, and
the metal hydroxide is disposed only inside the void.

2. The positive electrode material according to claim 1 , wherein
each of the positive electrode active material particles has a hollow structure having a shell configured of primary particles and a hollow portion formed inside thereof; and
the metal hydroxide is disposed in the hollow portion.

3. The positive electrode material according to claim 1 , wherein the metal hydroxide is included in the positive electrode material in an amount from 0.1 part by mass to 5 parts by mass per 100 parts by mass of the positive electrode active material particles.

4. The positive electrode material according to claim 1 , wherein aluminum hydroxide is included as the metal hydroxide.

5. The positive electrode material according to claim 1 , wherein the transition metal the lithium transition metal oxide includes at least nickel, cobalt, and manganese.

6. A method for manufacturing the positive electrode material according to claim 1 , the method comprising:
preparing positive electrode active material particles that can reversibly store and release a charge carrier, each of the positive electrode active material particles having a void inside the particle;
mixing the positive electrode active material particles with a predetermined metal salt;
reducing the metal salt and generating a hydroxide of the metal by inducing a redox reaction by using moisture in air or added moisture, and disposing the metal hydroxide at least inside the voids of the positive electrode active material particles; and
removing excess moisture by drying the positive electrode active material particles in which the metal hydroxide has been disposed only inside the voids.

Assignees

• Toyota Motor Co Ltd

Inventors

• Nakayama Tetsuri

Classifications

• Y02P70/50

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

• Y02E60/10

  Energy storage using batteries · CPC title

• C01P2004/34

  hollow · CPC title

• C01P2004/80

  Particles consisting of a mixture of two or more inorganic phases · CPC title

• C01G53/50

  of the type (MnO2)n-, e.g. Li(NixMn1-x)O2 or Li(MyNixMn1-x-y)O2 · CPC title