Coated lithium-nickel composite oxide particles and method for producing coated lithium-nickel composite oxide particles

Patent metadata

Field	Value
Publication number	US-10749182-B2
Application number	US-201515316974-A
Country	US
Kind code	B2
Filing date	May 20, 2015
Priority date	Jun 12, 2014
Publication date	Aug 18, 2020
Grant date	Aug 18, 2020

Abstract

Provided are excellent coated lithium-nickel composite oxide particles which are capable of suppressing the occurrence of impurities produced by absorbing water and carbonic acid gas as a result of the high environmental stability thereof, have strong adhesion properties, do not result in easy coating layer detachment, and also exhibit lithium ion conductivity. The surfaces of the lithium-nickel composite oxide particles are coated with a polymer or copolymer comprising one or more types selected from a group consisting of a modified polyolefin resin, a polyester resin, a polyphenol resin, a polyurethane resin, an epoxy resin, a silane-modified polyether resin, a silane-modified polyester resin, a silane-modified polyphenol resin, a silane-modified polyurethane resin, a silane-modified epoxy resin, and a silane-modified polyamide resin. As a result, the coated lithium-nickel composite oxide particles exhibit conductivity, and said compound is capable of suppressing the transmission of water and carbonic acid gas. Consequently, it is possible to provide coated lithium-nickel composite oxide particles for use in a lithium-ion battery positive electrode active material which is excellent for use in a lithium-ion battery.

First claim

The invention claimed is:

1. Coated lithium-nickel composite oxide particles for a lithium-ion battery positive-electrode active substance, comprising:
nickel-based lithium-nickel composite oxide particles; and
coated films of a polymer or copolymer coated on surfaces of the nickel-based lithium-nickel composite oxide particles,
wherein the polymer or copolymer includes at least one kind selected from the group consisting of a silane-modified polyether resin, a silane-modified polyester resin, a silane-modified polyphenol resin, a silane-modified polyurethane resin, a silane-modified epoxy resin, and a silane-modified polyamide resin,
wherein a coating amount of the polymer or copolymer is 0.05 to 5.0% by mass based on 100% by mass of the lithium-nickel composite oxide particles,
the silane-modified epoxy resin is produced by modifying part or the entire part of the hydroxyl groups of a bisphenol-type epoxy resin with a hydrolyzable alkoxysilane, and
the lithium-nickel composite oxide is represented by the following Formula (1),
Li x Ni( 1-y-z )M y N z O 2   (1)

wherein x is a value of from 0.80 to 1.10, y is a value of from 0.01 to 0.20, z is a value of from 0.01 to 0.15, and 1-y-z is a value exceeding 0.65, and M represents at least one element selected from Co or Mn, and N represents at least one element selected from Al, In or Sn.

2. The coated lithium-nickel composite oxide particles according to claim 1 , wherein the coated lithium-nickel composite oxide particles are spherical particles having an average particle diameter of 5 to 20 μm.

3. The coated lithium-nickel composite oxide particles according to claim 1 , wherein
the polymer or copolymer is a polymer or copolymer including at least one kind selected from the group consisting of a silane-modified polyether resin, a silane-modified polyester resin, a silane-modified polyphenol resin, a silane-modified polyurethane resin, and a silane-modified polyamide resin.

4. A method for producing the coated lithium-nickel composite oxide particles according to claim 1 , comprising:
preparing a solution of a resin for coating by dissolving a polymer or copolymer including at least one kind selected from the group consisting of a silane-modified polyether resin, a silane-modified polyester resin, a silane-modified polyphenol resin, a silane-modified polyurethane resin, a silane-modified epoxy resin, and a silane-modified polyamide resin in a good solvent dissolving the polymer or copolymer;
adding a poor solvent not dissolving the resin for coating and having an evaporation rate lower than that of the good solvent, into the solution of a resin for coating;
adding the lithium-nickel composite oxide particles into the solution of a resin for coating to prepare a slurry; and
removing the good solvent and the poor solvent sequentially from the slurry.

Assignees

• Sumitomo Metal Mining Co

Inventors

• Ota Yosuke

Classifications

• C01G53/42 Primary

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

• Y02E60/10

  Energy storage using batteries · CPC title

• H01M4/622

  being polymers · CPC title

• C01P2004/32

  Spheres · CPC title

• H01M10/30

  Nickel accumulators (H01M10/34 takes precedence) · CPC title