Lithium ion battery

Patent metadata

Field	Value
Publication number	US-11387462-B2
Application number	US-202016832097-A
Country	US
Kind code	B2
Filing date	Mar 27, 2020
Priority date	Apr 9, 2019
Publication date	Jul 12, 2022
Grant date	Jul 12, 2022

Abstract

An object of this disclosure is to provide a lithium ion battery in which generation of heat can be suitably suppressed. Provided is a lithium ion battery including a positive electrode and a negative electrode. The positive electrode includes a positive electrode collector, a positive electrode active material layer, and an insulating layer provided on another part of the surface of the positive electrode collector, so as to be adjacent to the positive electrode active material layer. The insulating layer contains an inorganic filler and a binder. At least part of the surface of the inorganic filler is covered with LPO.

First claim

What is claimed is:

1. A lithium ion battery, comprising:
a positive electrode; a negative electrode; and a nonaqueous electrolyte, wherein
the positive electrode includes
a positive electrode collector;
a positive electrode active material layer provided directly on part of the surface of the positive electrode collector; and
an insulating layer provided directly on another part of the surface of the positive electrode collector, so as to be adjacent to the positive electrode active material layer;
the insulating layer contains an inorganic filler, trilithium phosphate, and a binder; and
at least part of the surface of the inorganic filler is covered with the trilithium phosphate.

2. The lithium ion battery of claim 1 , wherein a ratio of the thickness of the trilithium phosphate that covers the inorganic filler with respect to the average particle size of the inorganic filler lies in the range of 0.1 to 1.2.

3. The lithium ion battery of claim 1 , wherein the average thickness of the insulating layer is 10 μm or less.

4. The lithium ion battery of claim 1 , wherein the inorganic filler is at least one selected from the group consisting of a boehmite powder, a zeolite powder, and an alumina powder.

Assignees

• Toyota Motor Co Ltd

Inventors

• Yamada Takanobu

Classifications

• Y02E60/10

  Energy storage using batteries · CPC title

• H01G11/06

  with one of the electrodes allowing ions to be reversibly doped thereinto, e.g. lithium ion capacitors [LIC] · CPC title

• H01M4/667 Primary

  in the form of layers, e.g. coatings · CPC title

• H01M4/131 Primary

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

• H01M2220/20

  Batteries in motive systems, e.g. vehicle, ship, plane · CPC title