Positive electrode composition for nonaqueous electrolyte secondary battery

Patent metadata

Field	Value
Publication number	US-9742002-B2
Application number	US-201313863887-A
Country	US
Kind code	B2
Filing date	Apr 16, 2013
Priority date	Apr 18, 2012
Publication date	Aug 22, 2017
Grant date	Aug 22, 2017

Abstract

A positive electrode composition for nonaqueous electrolyte secondary battery comprises a lithium transition metal complex oxide represented by a general formula Li a Ni 1−x−y Co x M 1 y W z M 2 w O 2 , where 1.0≦a≦1.5, 0≦x≦0.5, 0≦y≦0.5, 0.002≦z≦0.03, 0≦w≦0.02, 0≦x+y≦0.7, M 1 represents at least one selected from the group consisting of Mn and Al, and M 2 represents at least one selected from the group consisting of Zr, Ti, Mg, Ta, Nb and Mo; and a boron compound comprising at least boron element and oxygen element.

First claim

What is claimed is:

1. A positive electrode composition for a nonaqueous electrolyte secondary battery, the positive electrode composition comprising:
a lithium transition metal complex oxide represented by a general formula Li a Ni 1−x−y Co x Mn y W Z Zr w O 2 (wherein 1.0≦a≦1.5, 0≦x≦0.5, 0≦y≦0.5, 0.002≦z≦0.03, 0≦w≦0.02, 0≦x+y≦0.7); and
a boron compound comprising at least boron element and oxygen element,
wherein the boron compound is obtained by at least mixing the lithium transition metal complex oxide and a raw material compound of the boron compound,
wherein the raw material compound of the boron compound is orthoboric acid, and
wherein a ratio of the boron element to the lithium transition metal complex oxide is in a range of 0.5 mol % to 1.5 mol %.

2. The positive electrode composition according to claim 1 , wherein the boron compound is obtained by mixing the lithium transition metal complex oxide and the raw material compound of the boron compound followed by calcining.

3. The positive electrode composition according to claim 2 , wherein a calcination temperature in the calcining is 450° C. or less.

4. The positive electrode composition according to claim 1 , wherein the lithium transition metal complex oxide is in the form of particles, and at least portion of the boron compound exists on a surface of the particles of the lithium transition metal complex oxide.

5. The positive electrode composition according to claim 4 , wherein at least portion of the boron compound covers at least partially the surface of the particles of the lithium transition metal complex oxide.

6. The positive electrode composition according to claim 1 , wherein at least portion of the boron compound is chemically bonded to one or more elements constituting the lithium transition metal complex oxide.

7. A nonaqueous electrolyte secondary battery comprising a positive electrode, the positive electrode comprising the positive electrode composition according to claim 1 .

8. A method for producing a positive electrode composition for a nonaqueous electrolyte secondary battery, the positive electrode composition comprising a lithium transition metal complex oxide represented by a general formula Li a Ni 1−x−y Co x Mn y W Z Zr w O 2 (wherein 1.0≦a≦1.5, 0≦x≦0.5, 0≦y≦0.5, 0.002≦z≦0.03, 0≦w≦0.02, 0≦x+y≦0.7), and a boron compound comprising at least boron element and oxygen element, the method comprising at least:
synthesizing the lithium transition metal complex oxide; and
mixing the lithium transition metal complex oxide obtained by the synthesis and a raw material compound of the boron compound to obtain a mixture,
wherein the raw material compound of the boron compound is orthoboric acid, and
wherein the lithium transition metal complex oxide and the raw material compound of the boron compound are mixed such that a ratio of the boron element to the lithium transition metal complex oxide is in a range of 0.5 mol % to 1.5 mol %.

9. The method according to claim 8 , further comprising calcining the mixture.

10. The method according to claim 9 , wherein a calcination temperature in the calcining is 450° C. or less.

Assignees

• Shimokita Kousuke
• Kawai Kenta
• Inouchi Kiyofumi
• Nichia Corp

Inventors

• Shimokita Kousuke
• Kawai Kenta
• Inouchi Kiyofumi

Classifications

• H01M4/62

  Selection of inactive substances as ingredients for active masses, e.g. binders, fillers · CPC title

• H01M10/0525

  Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries · CPC title

• H01M4/505

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

• H01M4/362 Primary

  Composites · CPC title

• H01M4/36 Primary

  Selection of substances as active materials, active masses, active liquids · CPC title