Positive-electrode material for nonaqueous-electrolyte secondary battery, method for manufacturing the same, and nonaqueous-electrolyte secondary battery using said positive-electrode material

Patent metadata

Field	Value
Publication number	US-2017098821-A1
Application number	US-201615381171-A
Country	US
Kind code	A1
Filing date	Dec 16, 2016
Priority date	Feb 22, 2012
Publication date	Apr 6, 2017
Grant date	—

Abstract

Provided is a positive-electrode material for nonaqueous-electrolyte secondary batteries, the positive-electrode material being capable of achieving both high capacity and high output when used for a positive electrode for nonaqueous-electrolyte secondary batteries. Also, provided is a method for manufacturing the positive-electrode material for nonaqueous-electrolyte secondary batteries, wherein a lithium metal composite oxide powder is mixed with lithium tungstate, the lithium metal composite oxide powder being represented by a general formula Li z Ni 1-x-y Co x M y O 2 (wherein 0.10≦x≦0.35, 0≦y≦0.35, 0.97≦z≦1.20, and M is an addition element and at least one element selected from Mn, V, Mg, Mo, Nb, Ti, and Al) and comprising primary particles and secondary particles composed of aggregation of the primary particles.

First claim

What is claimed is:

1 . A method for manufacturing a positive-electrode material for a nonaqueous-electrolyte secondary batteries, the method comprising:
mixing a baked lithium metal composite oxide powder with a lithium tungstate powder so that the lithium tungstate powder is dispersed between particles of the lithium metal composite oxide powder, wherein the lithium metal composite oxide powder being represented by a general formula Li z Ni 1-x-y Co x M y O 2 (wherein 0.10≦x≦0.35, 0≦y≦0.35, 0.97≦z≦1.20, and M is an addition element and at least one element selected from Mn, V, Mg, Mo, Nb, Ti, and Al, and the lithium metal composite oxide powder comprising primary particles and secondary particles composed of aggregation of the primary particles; and then without baking the mixture of the lithium metal composite oxide powder and the lithium tungstate powder to obtain the positive-electrode material.

2 . The method of claim 1 , wherein the lithium metal composite oxide powder was water-washed prior to mixing with the lithium tungstate.

3 . The method of claim 2 , wherein an amount of tungsten contained in the positive-electrode material is 0.1 to 3.0 atom % with respect to a total number of atoms of nickel, cobalt, and M, that are contained in the lithium metal composite oxide powder.

4 . The method of claim 1 , wherein the lithium tungstate is selected from Li 2 WO 4 , Li 4 WO 5 , Li 6 W 2 O 9 , and a mixture thereof.

5 . The method of claim 4 , wherein the lithium tungstate includes Li 4 WO 5 .

6 . The method of claim 1 , further comprising press-forming the positive-electrode from the admixture of the lithium metal composite oxide powder, the lithium tungstate powder, the electrically conductive agent, and the binding agent.

7 . A method for manufacturing a positive-electrode for a nonaqueous-electrolyte secondary batteries, the method comprising:
mixing a baked lithium metal composite oxide powder with a lithium tungstate powder so that the lithium tungstate powder is dispersed between particles of the lithium metal composite oxide powder, wherein the lithium metal composite oxide powder being represented by a general formula Li z Ni 1-x-y Co x M y O 2 (wherein 0.10≦x≦0.35, 0≦y≦0.35, 0.97≦z≦1.20, and M is an addition element and at least one element selected from Mn, V, Mg, Mo, Nb, Ti, and Al, and the lithium metal composite oxide powder comprising primary particles and secondary particles composed of aggregation of the primary particles; and then without baking the mixture of the lithium metal composite oxide powder and the lithium tungstate powder admixing the mixture of the lithium metal composite oxide powder and the lithium tungstate powder with an electrically conductive agent and a binding agent; and then forming the positive-electrode from the admixture of the lithium metal composite oxide powder, the lithium tungstate powder, the electrically conductive agent, and the binding agent.

8 . The method of claim 7 , wherein the lithium metal composite oxide powder was water-washed prior to mixing with the lithium tungstate.

9 . The method of claim 8 , wherein an amount of tungsten contained in the positive-electrode material is 0.1 to 3.0 atom % with respect to a total number of atoms of nickel, cobalt, and M, that are contained in the lithium metal composite oxide powder.

10 . The method of claim 7 , wherein the lithium tungstate is selected from Li 2 WO 4 , Li 4 WO 5 , Li 6 W 2 O 9 , and a mixture thereof.

11 . The method of claim 10 , wherein the lithium tungstate includes Li 4 WO 5 .

12 . The method of claim 7 , wherein the electrically conductive agent is selected from graphite, acethylene black, and Ketchen black.

13 . The method of claim 7 , wherein the binding agent is selected from polyvinylidene fluoride (PVDF), polytetrafluoroethylene (PTFE), fluororubber, ethylene propylene diene rubber, styrene butadiene, cellulose resin, and polyacrylic acid.

Assignees

• Sumitomo Metal Mining Co

Inventors

• Kokado Rei
• Mori Kensaku
• Takagi Masanori
• Hayashi Tetsutaro

Classifications

• C01P2006/12

  Surface area · CPC title

• H01M2004/028

  Positive electrodes · CPC title

• C01P2004/61

  Micrometer sized, i.e. from 1-100 micrometer · CPC title

• C01P2004/62

  Submicrometer sized, i.e. from 0.1-1 micrometer · CPC title

• H01M4/1391 Primary

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