Positive electrode active material for lithium ion battery, positive electrode for lithium ion battery, and lithium ion battery

Patent metadata

Field	Value
Publication number	US-9231249-B2
Application number	US-201113576753-A
Country	US
Kind code	B2
Filing date	Feb 4, 2011
Priority date	Feb 5, 2010
Publication date	Jan 5, 2016
Grant date	Jan 5, 2016

Abstract

The present invention provides a positive electrode active material for a lithium ion battery with excellent battery characteristics can be provided. The positive electrode active material for a lithium ion battery is represented by the following composition formula:

Li(Li x Ni 1-x-y M y )O 2+α

(in the formula, M represents at least one selected from Sc, Ti, V, Cr, Mn, Fe, Co, Cu, Zn, Ga, Ge, Al, Bi, Sn, Mg, Ca, B, and Zr, 0≦x≦0.1, 0<y≦0.7, and α>0).

First claim

What is claimed is:

1. A positive electrode active material for a lithium ion battery which is represented by the following composition formula:
Li(Li x Ni 1-x-y M y )O 2+α
wherein M represents Co as an essential component and at least one selected from Sc, Ti, V, Cr, Mn, Fe, Ge, Cu, Zn, Ga, Ge, Al, Bi, Sn, Mg, Ca, B, and Zr;
wherein 0≦x≦0.1, 0<y≦0.7, and α>0;
wherein ratio of peak strength (Ps104) on (104) plane to peak strength (Ps003) on (003) plane, which is (Ps104/Ps003), is 0.9 or less and 2θ of (110) plane is 64.6° or more according to powder X-ray diffraction.

2. The positive electrode active material for a lithium ion battery of claim 1 , wherein M is at least one selected from Mn and Co.

3. The positive electrode active material for a lithium ion battery of claim 1 or 2 , wherein α>0.05 in the composition formula.

4. The positive electrode active material for a lithium ion battery of claim 3 , wherein α>0.1 in the composition formula.

5. The positive electrode active material for a lithium ion battery of claim 1 or 2 , wherein ratio of peak strength (Ps104/Ps003) is 0.85 or less.

6. The positive electrode active material for a lithium ion battery of claim 5 , wherein 28 of (110) plane is 64.7° or more.

7. The positive electrode active material for a lithium ion battery of any one of claim 1 or 2 , wherein 2θ of (018) plane is 64.45° or less and difference in 2θ between (018) plane and (110) plane is more than 0.1°.

8. A positive electrode for a lithium ion battery in which the positive electrode active material for a lithium ion battery of claim 1 or 2 is used.

9. A lithium ion battery in which the positive electrode for a lithium ion battery of claim 8 is used.

Assignees

• Kajiya Yoshio
• Okamoto Kentaro
• Jx Nippon Mining & Metals Corp

Inventors

• Kajiya Yoshio
• Okamoto Kentaro

Classifications

• H01M4/505 Primary

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

• C01G51/42

  containing alkali metals, e.g. LiCoO2 · CPC title

• C01P2002/54

  one element only · CPC title

• C01G53/42

  containing alkali metals, e.g. LiNiO2 · CPC title

• H01M4/525 Primary

  of mixed oxides or hydroxides containing iron, cobalt or nickel for inserting or intercalating light metals, e.g. LiNiO2, LiCoO2 or LiCoOxFy · CPC title