Nonaqueous electrolyte secondary battery

Patent metadata

Field	Value
Publication number	US-11430983-B2
Application number	US-201816495937-A
Country	US
Kind code	B2
Filing date	Feb 9, 2018
Priority date	Mar 27, 2017
Publication date	Aug 30, 2022
Grant date	Aug 30, 2022

Abstract

A nonaqueous electrolyte secondary battery includes a positive electrode containing a lithium transition metal oxide as a positive electrode active material, a negative electrode containing a carbon material as a negative electrode active material, and a nonaqueous electrolyte. The lithium transition metal oxide contains W and Si, and W and Si adhere to the surface of the carbon material constituting the negative electrode active material. The amount of W adhering to the surface of the carbon material is 2 times or less in terms of a molar ratio to the amount of Si adhering to the surface of the carbon material.

First claim

The invention claimed is:

1. A nonaqueous electrolyte secondary battery comprising:
a positive electrode containing a lithium transition metal oxide as a positive electrode active material;
a negative electrode containing a carbon material as a negative electrode active material; and
a nonaqueous electrolyte, wherein the lithium transition metal oxide contains W and Si;
W and Si adhere to the surface of the carbon material; and
the amount of W adhering to the surface of the carbon material is 2 times or less in terms of a molar ratio to the amount of Si adhering to the surface of the carbon material,
wherein the amount of Si adhering to the surface of the carbon material is 50×10 −6 or less in terms of molar ratio to the carbon material.

2. The nonaqueous electrolyte secondary battery according to claim 1 , wherein the lithium transition metal oxide contains W and Si as a solid solution.

3. The nonaqueous electrolyte secondary battery according to claim 1 , wherein the lithium transition metal oxide contains 10 mol % or more of Mn relative to the total amount of transition metals.

4. The nonaqueous electrolyte secondary battery according to claim 1 , wherein the average particle diameter of primary particles constituting the lithium transition metal oxide is 1 μm or more and 10 μm or less.

5. A nonaqueous electrolyte secondary battery comprising:
a positive electrode containing a lithium transition metal oxide as a positive electrode active material;
a negative electrode containing a carbon material as a negative electrode active material; and
a nonaqueous electrolyte,
wherein the lithium transition metal oxide contains W and Si;
W and Si adhere to the surface of the carbon material; and
the amount of W adhering to the surface of the carbon material is 2 times or less in terms of a molar ratio to the amount of Si adhering to the surface of the carbon material,
wherein the lithium transition metal oxide contains W and Si as a solid solution.

6. The nonaqueous electrolyte secondary battery according to claim 5 , wherein the lithium transition metal oxide contains 10 mol % or more of Mn relative to the total amount of transition metals.

7. The nonaqueous electrolyte secondary battery according to claim 5 , wherein the average particle diameter of primary particles constituting the lithium transition metal oxide is 1 μm or more and 10 μm or less.

Assignees

• Panasonic Ip Man Co Ltd

Inventors

• Niina Fumiharu
• Ko Takashi
• Yanagida Katsunori

Classifications

• H01M4/38

  of elements or alloys · CPC title

• H01M4/386

  Silicon or alloys based on silicon · CPC title

• H01M4/131 Primary

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

• H01M4/587

  for inserting or intercalating light metals · CPC title

• Y02E60/10

  Energy storage using batteries · CPC title