Manganese spinel-type lithium transition metal oxide

Patent metadata

Field	Value
Publication number	US-9537140-B2
Application number	US-201314397324-A
Country	US
Kind code	B2
Filing date	Apr 25, 2013
Priority date	Apr 27, 2012
Publication date	Jan 3, 2017
Grant date	Jan 3, 2017

Abstract

Provided is a new 5 V class spinel exhibiting an operating potential of 4.5 V or more (5 V class), which can suppress the amount of gas generation during high temperature cycles. Suggested is a manganese spinel-type lithium transition metal oxide represented by formula: Li[Ni y Mn 2-(a+b)-y-z Li a Ti b M z ]O 4 (wherein 0≦z≦0.3, 0.3≦y<0.6, and M=at least one or more metal elements selected from the group consisting of Al, Mg, Fe and Co), in which in the above formula, the following relationships are satisfied: a>0, b>0, and 3≦b/a≦8.

First claim

The invention claimed is:

1. A manganese spinel-type lithium transition metal oxide represented by formula: Li[Ni y Mn 2-(a+b)-y-z Li a Ti b M z ]O 4 , wherein 0≦z≦0.3, 0.3≦y<0.6, and M=at least one or more metal elements selected from the group consisting of Al, Mg, Fe and Co, having a crystal structure of space group Fd-3m, wherein in the above formula, the Ni y , Mn 2-(a+b)-y-z , Li a , Ti b and M z exist in 16d sites in the crystal structure of the space group Fd-3m, a molar ratio of Li (a) existing in the 16d sites is a>0, a molar ratio of Ti (b) existing in the 16d sites is b>0, a total molar ratio of Li, Ti, Ni, and M (a+b+y+z) existing in the 16d sites is 0.3<(a+b+y+z), and the molar ratio of Ti with respect to Li (b/a) existing in the 16d sites is 3≦b/a≦8, the manganese spinel-type lithium transition metal oxide exhibiting an operating potential of 4.5 V or more.

2. The manganese spinel-type lithium transition metal oxide according to claim 1 , wherein a lattice constant is 8.16 Å to 8.22 Å.

3. The manganese spinel-type lithium transition metal oxide according to claim 1 , wherein a specific surface area is 0.10 m 2 /g to 1.00 m 2 /g.

4. The manganese spinel-type lithium transition metal oxide according to claim 1 , wherein an oxygen occupancy rate that can be determined by a Rietveld analysis is 0.87 to 1.00.

5. A lithium secondary battery comprising the manganese spinel-type lithium transition metal oxide according to claim 1 as a positive electrode active material.

6. The manganese spinel-type lithium transition metal oxide according to claim 2 , wherein a specific surface area is 0.10 m 2 /g to 1.00 m 2 /g.

7. The manganese spinel-type lithium transition metal oxide according to claim 2 , wherein an oxygen occupancy rate that can be determined by a Rietveld analysis is 0.87 to 1.00.

8. The manganese spinel-type lithium transition metal oxide according to claim 3 , wherein an oxygen occupancy rate that can be determined by a Rietveld analysis is 0.87 to 1.00.

9. A lithium secondary battery comprising the manganese spinel-type lithium transition metal oxide according to claim 2 as a positive electrode active material.

10. A lithium secondary battery comprising the manganese spinel-type lithium transition metal oxide according to claim 3 as a positive electrode active material.

11. A lithium secondary battery comprising the manganese spinel-type lithium transition metal oxide according to claim 4 as a positive electrode active material.

Assignees

• Mitsui Mining & Smelting Co

Inventors

• Shibamura Natsumi
• Todorov Yanko Marinov
• Kagei Shinya
• Hata Yoshimi

Classifications

• H01M4/505

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

• H01M4/485

  of mixed oxides or hydroxides for inserting or intercalating light metals, e.g. LiTi2O4 or LiTi2OxFy (H01M4/505, H01M4/525 take precedence) · CPC title

• C01P2002/52

  containing elements as dopants · CPC title

• C01P2002/32

  spinel-type (AB2O4) · CPC title

• C01P2002/77

  by unit-cell parameters, atom positions or structure diagrams · CPC title