Method of Manufacturing a Positive Electrode Active Material for Lithium Secondary Batteries

• US 20140010752A1
• Filed: 12/19/2011
• Published: 01/09/2014
• Est. Priority Date: 12/28/2010
• Status: Active Grant

• Current Assignee: Mitsui Mining and Smelting Company Limited
• Original Assignee: Mitsui Mining and Smelting Company Limited
• Inventors: Kagei, Shinya, Hata, Yoshimi, Ochi, Yasuhiro
• Granted Patent: US 10,442,699 B2
• Time in Patent Office: Days
• US Class Current: 423/594.15
• CPC Class Codes: C01D 15/02 Oxides; Hydroxides
• CPC Class Codes: C01G 45/12 Manganates manganites or permanganates
• CPC Class Codes: C01G 45/1221 Manganates or manganites with a manganese oxidation state of Mn(III), Mn(IV) or mixtures thereof
• CPC Class Codes: C01G 45/1242 of the type [Mn2O4]-, e.g. LiMn2O4, Li[MxMn2-x]O4
• 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: C01G 53/54 of the type [Mn2O4]-, e.g. Li(NixMn2-x)O4, Li(MyNixMn2-x-y)O4
• CPC Class Codes: C01P 2006/40 Electric properties
• CPC Class Codes: C01P 2006/80 Compositional purity
• CPC Class Codes: C01P 2006/82 water content
• 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

Provided is a new method for producing a positive electrode active material for lithium secondary batteries, by which even in the case of washing a spinel type lithium transition metal oxide with water or the like, the service life characteristics can be further enhanced, and the concentration of magnetic substances can be effectively reduced. Suggested is a method for producing a positive electrode active material for lithium secondary batteries, the method including a water washing step of bringing a powder of a spinel type lithium transition metal oxide into contact with a polar solvent and thereby washing the powder; and a drying step of subsequently drying the powder by heating the powder to 300° C. to 700° C. in an atmosphere containing oxygen.

Claims

1. A method for producing a positive electrode active material for lithium secondary batteries, the method comprising bringing a powder of a spinel type (Fd-3m) lithium transition metal oxide into contact with a polar solvent and thereby washing the powder;

and subsequently, drying the powder by heating the powder to 300°

C. to 700°

C. in an atmosphere containing oxygen.

3. The method for producing a positive electrode active material for lithium secondary batteries according to claim 1, wherein in the drying, the material is heated by controlling the temperature to a temperature region lower than a primary oxygen release temperature.

4. The method for producing a positive electrode active material for lithium secondary batteries according to claim 1, wherein in the magnetic separation process, a wet type magnetic separator including a magnet of 8,000 G to 17,000 G is used.

7. The method for producing a positive electrode active material for lithium secondary batteries according to claim 3, wherein in the magnetic separation process, a wet type magnetic separator including a magnet of 8,000 G to 17,000 G is used.

2. A method for producing a positive electrode active material for lithium secondary batteries, the method comprising bringing a powder of a spinel type (Fd-3m) lithium transition metal oxide into contact with a polar solvent and thereby forming a slurry;

feeding the slurry thus obtained in the washing step into a wet type magnetic separator, collecting magnetic substances that have attached to a magnet, and thereby removing the magnetic substances; and

subsequently, drying the slurry by heating the slurry to 300°

C. to 700°

C. in an atmosphere containing oxygen.

5. The method for producing a positive electrode active material for lithium secondary batteries according to claim 2, wherein in the drying, the material is heated by controlling the temperature to a temperature region lower than a primary oxygen release temperature.

6. The method for producing a positive electrode active material for lithium secondary batteries according to claim 2, wherein in the magnetic separation process, a wet type magnetic separator including a magnet of 8,000 G to 17,000 G is used.