Spinel-type lithium manganese-based composite oxide

Patent metadata

Field	Value
Publication number	US-9437873-B2
Application number	US-201214002524-A
Country	US
Kind code	B2
Filing date	Feb 29, 2012
Priority date	Mar 2, 2011
Publication date	Sep 6, 2016
Grant date	Sep 6, 2016

Abstract

Regarding spinel-type lithium manganese-based composite oxide (LMO) to be used as a positive electrode active substance material for lithium battery, a novel LMO is provided, which is capable of maintaining discharge capacity even if charging and discharging are repeated under high temperatures. An LMO in which the crystallite size is 250 nm to 350 nm, the strain is 0.085 or less and the specific surface area increase rate when placed in water at 25° and pH 7 and ultrasonically dispersed at 40 W ultrasonic intensity for 600 seconds is 10.0% or less, can prevent a decrease in the output that accompanies the repetition of charging and discharging while at a high temperature.

First claim

The invention claimed is:

1. A spinel-type (space group Fd-3m) lithium manganese based composite oxide, wherein
crystallite size is 250 nm to 350 nm, strain is 0.085 or less, and
wherein a specific surface area increase rate when placed in water at 25° and pH 7 and ultrasonically dispersed at 40 W ultrasonic intensity for 600 seconds is 10.0% or less, and
wherein an average particle size (D50) is 5 μm to 25 μm.

2. The spinel-type (space group Fd-3m) lithium manganese based composite oxide according to claim 1 , wherein specific surface area after ultrasonic dispersion/specific surface area before ultrasonic dispersion is 1.00 to 1.07.

3. The spinel-type lithium manganese-based composite oxide according to claim 1 , represented by the general formula Li 1+x M 2-x O 4 (where M includes Mn and includes any one species or two species or more among the group comprising Mg, Al, Ti, Ni, Co, Mo, W, Nb, Ta, Re and Fe; x is 0.01 to 0.08).

4. The spinel-type lithium manganese-based composite oxide according to claim 1 , prepared using electrolytic manganese as manganese raw materials.

5. The spinel-type lithium manganese-based composite oxide according to claim 1 , prepared using electrolytic manganese dioxide as manganese raw materials.

6. The spinel-type lithium manganese-based composite oxide according to claim 1 , obtained by firing at 850° C. or higher.

7. The spinel-type lithium manganese-based composite oxide according to claim 2 , represented by the general formula Li 1+x M 2-x O 4 (where M includes Mn and includes any one species or two species or more among the group comprising Mg, Al, Ti, Ni, Co, Mo, W, Nb, Ta, Re and Fe; x is 0.01 to 0.08).

8. The spinel-type lithium manganese-based composite oxide according to claim 2 , prepared using electrolytic manganese as manganese raw materials.

9. The spinel-type lithium manganese-based composite oxide according to claim 3 , prepared using electrolytic manganese as manganese raw materials.

10. The spinel-type lithium manganese-based composite oxide according to claim 2 , prepared using electrolytic manganese dioxide as manganese raw materials.

11. The spinel-type lithium manganese-based composite oxide according to claim 3 , prepared using electrolytic manganese dioxide as manganese raw materials.

12. The spinel-type lithium manganese-based composite oxide according to claim 2 , obtained by firing at 850° C. or higher.

13. The spinel-type lithium manganese-based composite oxide according to claim 3 , obtained by firing at 850° C. or higher.

14. The spinel-type lithium manganese-based composite oxide according to claim 4 , obtained by firing at 850° C. or higher.

15. The spinel-type lithium manganese-based composite oxide according to claim 5 , obtained by firing at 850° C. or higher.

Assignees

• Taniguchi Satoru
• Kagei Shinya
• Hata Yoshimi
• Mitsui Mining & Smelting Co

Inventors

• Taniguchi Satoru
• Kagei Shinya
• Hata Yoshimi

Classifications

• H01M4/505 Primary

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

• Y02E60/122

  Cross-Sectional Technologies · mapped topic

• C01G45/1242

  of the type (Mn2O4)-, e.g. LiMn2O4 or Li(MxMn2-x)O4 · CPC title

• C01P2002/76

  by a space-group or by other symmetry indications · CPC title

• C01P2002/52

  containing elements as dopants · CPC title