Spinel-type lithium metal composite oxide

Patent metadata

Field	Value
Publication number	US-9960423-B2
Application number	US-201415037850-A
Country	US
Kind code	B2
Filing date	Nov 21, 2014
Priority date	Nov 22, 2013
Publication date	May 1, 2018
Grant date	May 1, 2018

Abstract

Provided is a spinel-type lithium metal composite oxide that makes it possible to achieve excellent high-temperature storage characteristics when used as a positive electrode active material of a lithium battery. The spinel-type (Fd-3m) lithium metal composite oxide is characterized by the oxygen occupancy (OCC) thereof as determined by the Rietveld method being 0.965-1.000, the lattice strain thereof as determined by the Williamson-Hall method being 0.015-0.090, and the ratio (Na/Mn) of the molar content of Na to the molar content of Mn satisfying 0.00<Na/Mn<1.00×10 −2 .

First claim

The invention claimed is:

1. A spinel-type (Fd-3m) lithium metal composite oxide in which oxygen occupancy (OCC) is 0.965 to 1.000 as determined by the Rietveld method, lattice strain is 0.015 to 0.090 as determined by the Williamson-Hall method, and a ratio (Na/Mn) of a molar content of Na to a molar content of Mn satisfies 0.00<Na/Mn<1.00 10 −2 .

2. The spinel-type (Fd-3m) lithium metal composite oxide according to claim 1 , wherein a crystallite size is 100 nm to 250 nm.

3. The spinel-type (Fd-3m) lithium metal composite oxide according to claim 2 , wherein the spinel-type (Fd-3m) lithium metal composite oxide is represented by a general formula: Li 1+x M 2-x O 4 wherein, M in the formula represents Mn and optionally one or more metal elements selected from the group consisting of Al, Mg, Ca, Ti, Ba, Cr, Fe, Co, Ni, Cu, and Zn, and x is 0.01 to 0.09.

4. A lithium secondary battery having the spinel-type lithium metal composite oxide according to claim 3 as a positive electrode active material.

5. A lithium secondary battery having the spinel-type lithium metal composite oxide according to claim 2 as a positive electrode active material.

6. The spinel-type (Fd-3m) lithium metal composite oxide according to claim 1 , wherein the spinel-type (Fd-3m) lithium metal composite oxide is represented by a general formula: Li 1+x M 2-x O 4 wherein, M in the formula represents Mn and optionally one or more metal elements selected from the group consisting of Al, Mg, Ca, Ti, Ba, Cr, Fe, Co, Ni, Cu, and Zn, and x is 0.01 to 0.09.

7. A lithium secondary battery having the spinel-type lithium metal composite oxide according to claim 6 as a positive electrode active material.

8. A lithium secondary battery having the spinel-type lithium metal composite oxide according to claim 1 as a positive electrode active material.

9. A spinel-type (Fd-3m) lithium metal composite oxide in which oxygen occupancy (OCC) is 0.965 to 1.000 as determined by the Rietveld method, lattice strain is 0.020 to 0.090 as determined by the Williamson-Hall method, and a ratio (Na/Mn) of a molar content of Na to a molar content of Mn satisfies 0.00<Na/Mn<1.00 10 −2 .

10. The spinel-type (Fd-3m) lithium metal composite oxide according to claim 9 , wherein a crystallite size is 100 nm to 250 nm.

11. The spinel-type (Fd-3m) lithium metal composite oxide according to claim 10 , wherein the spinel-type (Fd-3m) lithium metal composite oxide is represented by a general formula: Li 1+x M 2-x O 4 wherein, M in the formula represents Mn and optionally one or more metal elements selected from the group consisting of Al, Mg, Ca, Ti, Ba, Cr, Fe, Co, Ni, Cu, and Zn, and x is 0.01 to 0.09.

12. A lithium secondary battery having the spinel-type lithium metal composite oxide according to claim 11 as a positive electrode active material.

13. The spinel-type (Fd-3m) lithium metal composite oxide according to claim 9 , wherein the spinel-type (Fd-3m) lithium metal composite oxide is represented by a general formula: Li 1+x M 2-x O 4 wherein, M in the formula represents Mn and optionally one or more metal elements selected from the group consisting of Al, Mg, Ca, Ti, Ba, Cr, Fe, Co, Ni, Cu, and Zn, and x is 0.01 to 0.09.

14. A lithium secondary battery having the spinel-type lithium metal composite oxide according to claim 13 as a positive electrode active material.

15. A lithium secondary battery having the spinel-type lithium metal composite oxide according to claim 9 as a positive electrode active material.

Assignees

• Mitsui Mining & Smelting Co

Inventors

• Ide Hitohiko
• Washida Daisuke
• Hoshi Yuji
• Hata Yoshimi

Classifications

• H01M50/417

  Polyolefins · CPC title

• H01M10/052

  Li-accumulators · CPC title

• C01P2002/60

  Compounds characterised by their crystallite size · CPC title

• C01P2006/40

  Electric properties · CPC title

• H01M4/1391

  of electrodes based on mixed oxides or hydroxides, or on mixtures of oxides or hydroxides, e.g. LiCoOx · CPC title