Lithium ion secondary battery

Patent metadata

Field	Value
Publication number	US-11949111-B2
Application number	US-201917054697-A
Country	US
Kind code	B2
Filing date	May 9, 2019
Priority date	May 17, 2018
Publication date	Apr 2, 2024
Grant date	Apr 2, 2024

Abstract

In a lithium ion secondary battery ( 1 ), a positive electrode ( 2 ) and a negative electrode ( 3 ) are alternately adjacent to each other via separators ( 4 ) and ( 5 ). The positive electrode ( 2 ) includes a positive electrode current collector composed of a metal porous body, a first positive electrode active material ( 21 ) held on one side of the positive electrode current collector, and a second positive electrode active material ( 22 ) held on the other side. The negative electrode ( 3 ) includes a negative electrode current collector composed of a metal porous body, a first negative electrode active material ( 31 ) held on one side of the negative electrode current collector, and a second negative electrode active material ( 32 ) held on the other side. The first positive electrode active material ( 21 ) faces the first negative electrode active material ( 31 ), and the positive electrode active material ( 22 ) faces the second negative electrode active material ( 32 ).

First claim

The invention claimed is:

1. A lithium ion secondary battery comprising
a structure in which at least one positive electrode and at least one negative electrode are alternately adjacent to each other via a separator,
the at least one positive electrode comprising:
a positive electrode current collector composed of a metal porous body having a three-dimensional network structure;
a first positive electrode active material including a high-capacity active material held on one side of the positive electrode current collector; and
a second positive electrode active material including a high-power active material held on the other side of the positive electrode current collector, and

the at least one negative electrode comprising:
a negative electrode current collector composed of a metal porous body having a three-dimensional network structure;
a first negative electrode active material including a high-capacity active material held on one side of the negative electrode current collector; and
a second negative electrode active material including a high-power active material held on the other side of the negative electrode current collector,

wherein the first positive electrode active material faces the first negative electrode active material adjacent thereto via a first separator, and the second positive electrode active material faces the second negative electrode active material of the negative electrode adjacent thereto via a second separator,
wherein a thickness of the first positive electrode active material is larger than a thickness of the second positive electrode active material, and a thickness of the first negative electrode active material is larger than a thickness of the second negative electrode active material, and
wherein at least one of the thickness of the first positive electrode active material and the thickness of the first negative electrode active material is in a range of 100 to 250 μm, and at least one of the thickness of the second positive electrode active material and the thickness of the second negative electrode active material is in a range of 50 to 150 μm.

2. The lithium ion secondary battery according to claim 1 ,
wherein the first positive electrode active material comprises at least one selected from a group consisting of Li(Ni 5/10 Co 2/10 Mn 3/10 )O 2 , Li(Ni 6/10 Co 2/10 Mn 2/10 )O 2 , Li(Ni 8/10 Co 1/10 Mn 1/10 )O 2 , and Li(Ni 0.8 Co 0.15 Al 0.05 )O 2 , and
the second positive electrode active material comprises at least one selected from a group consisting of Li(Ni 1/6 Co 4/6 Mn 1/6 )O 2 and Li(Ni 1/3 Co 1/3 Mn 1/3 )O 2 .

3. The lithium ion secondary battery according to claim 1 ,
wherein the first negative electrode active material comprises at least one selected from a group consisting of artificial graphite, natural graphite, Si, and SiO, and
the second negative electrode active material comprises hard carbon.

4. The lithium ion secondary battery according to claim 2 ,
wherein at least one of the thickness of the first positive electrode active material and the thickness of the first negative electrode active material is in a range of 100 to 250 μm, and at least one of the thickness of the second positive electrode active material and the thickness of the second negative electrode active material is in a range of 50 to 150 μm.

Assignees

• Honda Motor Co Ltd
• Sumitomo Electric Industries

Inventors

• Tanaami Kiyoshi
• Tanaka Akihisa
• Aoyagi Shintaro
• Okuno Kazuki
• Hosoe Akihisa
• Senoo Kikuo
• Takebayashi Hiroshi

Classifications

• H01M4/661 Primary

  Metal or alloys, e.g. alloy coatings (H01M4/669 take precedence) · CPC title

• H01M4/131

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

• H01M4/133

  Electrodes based on carbonaceous material, e.g. graphite-intercalation compounds or CFx · CPC title

• H01M4/134

  Electrodes based on metals, Si or alloys · CPC title

• H01M4/505

  of mixed oxides or hydroxides containing manganese for inserting or intercalating light metals, e.g. LiMn2O4 or LiMn2OxFy · CPC title