Positive electrode active material including lithium transition metal particles with graphene coating layer positive electrode and lithium ion secondary battery including the same

Patent metadata

Field	Value
Publication number	US-10243215-B2
Application number	US-201615076137-A
Country	US
Kind code	B2
Filing date	Mar 21, 2016
Priority date	Mar 27, 2015
Publication date	Mar 26, 2019
Grant date	Mar 26, 2019

Abstract

A positive electrode active material for lithium ion secondary battery includes: active material particles including one or more compounds including Li and a transition metal; and a coating layer coating at least a part of a surface of the active material particles. The coating layer includes at least one of graphene or multilayer graphene The coating layer has a Raman spectrum with a G band (a peak of 1530 cm −1 to 1630 cm −1 ), a D band (a peak of 1300 cm −1 to 1400 cm −1 ), and a 2D band (a peak of 2650 cm −1 to 2750 cm −1 ). At least the intensity of the 2D band normalized by the intensity of the G band (2D int /G int ) satisfies 0.05≤2D int /G int .

First claim

What is claimed is:

1. A positive electrode active material for lithium ion secondary battery, comprising:
active material particles including one or more compounds including Li and a transition metal; and
a coating layer coating at least a part of a surface of the active material particles,
wherein the coating layer includes at least one of graphene or multilayer graphene,
the coating layer has a Raman spectrum with a G band, a D band and a 2D band, where the G band is a peak of 1530 cm −1 to 1630 cm −1 , the D band is a peak of 1300 cm −1 to 1400 cm −1 , and the 2D band is a peak of 2650 cm −1 to 2750 cm −1 ,
at least the intensity of the 2D band normalized by the intensity of the G band (2D int /G int ) satisfies 0.05≤2D int /G int ≤0.438, and
the intensity of the D band normalized by the intensity of the G band (D int /G int ) satisfies 0.513≤D int /G int ≤0.964.

2. The positive electrode active material for lithium ion secondary battery according to claim 1 , wherein the intensity of the D band normalized by the intensity of the G band (D int /G int ) satisfies 0.6≤D int /G int ≤0.964.

3. The positive electrode active material for lithium ion secondary battery according to claim 1 , wherein the intensity of the 2D band normalized by the intensity of the G band (2D int /G int ) satisfies 0.1≤2D int /G int ≤0.438.

4. The positive electrode active material for lithium ion secondary battery according to claim 3 , wherein the intensity of the D band normalized by the intensity of the G band (D int /G int ) satisfies 0.6≤D int /G int ≤0.964.

5. A positive electrode for lithium ion secondary battery, comprising the positive electrode active material for lithium ion secondary battery according to claim 1 .

6. A positive electrode for lithium ion secondary battery, the electrode comprising the positive electrode active material for lithium ion secondary battery according to claim 2 .

7. A positive electrode for lithium ion secondary battery, comprising the positive electrode active material for lithium ion secondary battery according to claim 3 .

8. A positive electrode for lithium ion secondary battery, comprising the positive electrode active material for lithium ion secondary battery according to claim 4 .

9. A lithium ion secondary battery comprising:
the positive electrode for lithium ion secondary battery according to claim 5 ;
a negative electrode including a negative electrode active material;
a separator disposed between the positive electrode and the negative electrode; and
a nonaqueous electrolyte.

10. A lithium ion secondary battery comprising:
the positive electrode for lithium ion secondary battery according to claim 6 ;
a negative electrode including a negative electrode active material;
a separator disposed between the positive electrode and the negative electrode; and
a nonaqueous electrolyte.

11. A lithium ion secondary battery comprising:
the positive electrode for lithium ion secondary battery according to claim 7 ;
a negative electrode including a negative electrode active material;
a separator disposed between the positive electrode and the negative electrode; and
a nonaqueous electrolyte.

12. A lithium ion secondary battery comprising:
the positive electrode for lithium ion secondary battery according to claim 8 ;
a negative electrode including a negative electrode active material;
a separator disposed between the positive electrode and the negative electrode; and
a nonaqueous electrolyte.

Assignees

• Tdk Corp

Inventors

• SHITABA Junpei
• Seki Hideaki
• Miyabara Hiroyuki

Classifications

• H01M4/505

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

• H01M4/485

  of mixed oxides or hydroxides for inserting or intercalating light metals, e.g. LiTi2O4 or LiTi2OxFy (H01M4/505, H01M4/525 take precedence) · CPC title

• H01M10/0525

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

• H01M4/366 Primary

  as layered products · CPC title

• H01M2004/028

  Positive electrodes · CPC title