POSITIVE ELECTRODE ACTIVE MATERIAL

• US 20130164623A1
• Filed: 08/22/2011
• Published: 06/27/2013
• Est. Priority Date: 09/02/2010
• Status: Active Grant

• Current Assignee: Sumitomo Chemical Company Limited
• Original Assignee: Sumitomo Chemical Company Limited
• Inventors: Saka, Maiko, Takamori, Kenji, Pitteloud, Cedric, Nakayama, Tetsuri
• Granted Patent: US 9,287,554 B2
• Time in Patent Office: Days
• US Class Current: 429/223
• CPC Class Codes: C01G 53/50 of the type [MnO2]n- , e.g. Li(NixMn1-x)O2, Li(MyNixMn1-x-y)O2
• CPC Class Codes: C01P 2002/76 by a space-group or by other symmetry indications
• CPC Class Codes: C01P 2006/12 Surface area
• CPC Class Codes: H01M 10/052 Li-accumulators
• CPC Class Codes: H01M 4/131 Electrodes based on mixed oxides or hydroxides, or on mixtures of oxides or hydroxides, e.g. LiCoOx
• CPC Class Codes: H01M 4/485 of mixed oxides or hydroxides for inserting or intercalating light metals, e.g. LiTi2O4 or LiTi2OxFy H01M4/505, H01M4/525 take precedence
• 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 present invention provides a positive electrode active material. The positive electrode active material is represented by the following formula (I) and has a BET specific surface area of larger than 5 m²/g and not larger than 15 m²/g:

Li_xM¹_yM³_1-yO₂  (I)

wherein M¹ is at least one transition metal element selected from Group 5 elements and Group 6 elements of the Periodic Table, M³ is at least one transition metal element other than M¹ and selected from among transition metal elements excluding Fe, x is not less than 0.9 and not more than 1.3, and y is more than 0 and less than 1.

Claims

1. A positive electrode active material that is represented by the following formula (I) and has a BET specific surface area of larger than 5 m²/g and not larger than 15 m²/g:

Li_xM¹_yM³_1-yO₂ 

 

(I)

wherein M¹ is at least one transition metal element selected from Group 5 elements and Group 6 elements of the Periodic Table, M³ is at least one transition metal element other than M¹ and selected from among transition metal elements excluding Fe, x is not less than 0.9 and not more than 1.3, and y is more than 0 and less than 1.

2. The positive electrode active material according to claim 1, wherein M¹ is V (vanadium).

3. The positive electrode active material according to claim 1, wherein M³ is at least one transition metal element selected from the group consisting of Ni, Co, and Mn.

4. The positive electrode active material according to claim 1, wherein y is more than 0 and not more than 0.03.

5. The positive electrode active material according to claim 1, wherein y is more than 0 and not more than 0.01.

6. A positive electrode comprising the positive electrode active material according to claim 1.

7. A nonaqueous electrolyte secondary battery comprising the positive electrode according to claim 6.