POSITIVE ELECTRODE ACTIVE MATERIAL FOR LITHIUM ION SECONDARY BATTERY

• US 20130337332A1
• Filed: 02/28/2012
• Published: 12/19/2013
• Est. Priority Date: 03/09/2011
• Status: Active Grant

• Current Assignee: Nissan Motor Co., Ltd.
• Original Assignee: Kenzo Oshihara
• Inventors: Ito, Atsushi, Ohsawa, Yasuhiko, Oshihara, Kenzo
• Granted Patent: US 8,916,295 B2
• Time in Patent Office: Days
• US Class Current: 429/223
• CPC Class Codes: C01G 53/56 of the type [MnO3]2-, e.g. Li2[NixMn1-xO3], Li2[MyNixMn1-x-yO3
• CPC Class Codes: C01P 2004/62 Submicrometer sized, i.e. from 0.1-1 micrometer
• CPC Class Codes: C01P 2004/64 Nanometer sized, i.e. from 1-100 nanometer
• CPC Class Codes: H01M 4/505 of mixed oxides or hydroxides containing manganese for inserting or intercalating light metals, e.g. LiMn2O4 or LiMn2OxFy
• CPC Class Codes: H01M 4/525 of mixed oxides or hydroxides containing iron, cobalt or nickel for inserting or intercalating light metals, e.g. LiNiO2, LiCoO2 or LiCoOxFy
• CPC Class Codes: Y02E 60/10 Energy storage using batteries

Abstract

The positive electrode active material includes a compound represented by the following composition formula:

[Li_1.5][Li_0.5(1-x)Mn_1-xM_1.5x]O₃

(wherein x satisfies 0.1≦x≦0.5, and M is represented by Ni_αCo_βMn_γ in which α, β and γ satisfy 0<α≦0.5, 0≦β≦0.33 and 0<γ≦0.5, respectively), wherein a half width of the peak of a (001) crystal plane of the compound measured by X-ray diffraction is in a range from 0.14 to 0.33 inclusive, and an average primary particle diameter of the compound is in a range from 0.03 μm to 0.4 μm inclusive.

Claims

1-4. -4. (canceled)

5. A positive electrode active material for a lithium ion secondary battery, comprising a compound represented by the following composition formula:

[Li_1.5][Li_0.5(1-x)Mn_1-xM_1.5x]O₃

(wherein x satisfies 0.15≦

x≦

0.30, and M is represented by Ni_α

Co_β

Mn_γ

in which α

, β and

γ

satisfy 0<

α

≦

0.5, 0≦

β

≦

0.33 and 0<

γ

≦

0.5, respectively),

wherein a half width of a peak of a (001) crystal plane of the compound measured by X-ray diffraction is in a range from 0.19 to 0.212 inclusive, and

an average primary particle diameter of the compound is in a range from 0.19 μ

m to 0.25 μ

m inclusive.

6. The positive electrode active material for a lithium ion secondary battery according to claim 5,

wherein x in the composition formula satisfies 0.15≦

x≦

0.25, and α

, β and

γ

satisfy 0<

α

≦

0.457, 0≦

β

≦

0.1 and 0<

γ

≦

0.457, respectively.

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