Non-aqueous secondary battery

Patent metadata

Field	Value
Publication number	US-2017005334-A1
Application number	US-201515113655-A
Country	US
Kind code	A1
Filing date	Jan 23, 2015
Priority date	Jan 24, 2014
Publication date	Jan 5, 2017
Grant date	—

Abstract

A positive electrode mixture layer of a non-aqueous secondary battery of the present invention contains a first positive electrode active material and a second positive electrode active material each composed of a lithium-containing composite oxide represented by General Composition Formula (1): Li 1+y MO 2 (1). The first positive electrode active material contains Co, and the second positive electrode active material contains Co, Ni and Mn. The ratio of the first positive electrode active material to all positive electrode active materials contained in the positive electrode mixture layer is 20 mass % or more. The positive electrode mixture layer has a density of 3.4 g/cm 3 or less. Further, a negative electrode mixture layer contains carbon-coated SiOx and graphite, or a conductive layer is formed on a surface of a positive electrode current collector.

First claim

1 .- 10 . (canceled)

11 . A non-aqueous secondary battery comprising:
a positive electrode; a negative electrode; a non-aqueous electrolyte; and a separator, wherein the positive electrode includes a positive electrode mixture layer, the positive electrode mixture layer contains a first positive electrode active material and a second positive electrode active material each composed of a lithium-containing composite oxide represented by General Composition Formula (1):
Li 1+y MO 2   (1)

where y satisfies −0.15≦y≦0.15, and M represents a single element or an element group including at least one selected from Co, Ni, Ti, Cr, Fe, Cu, Zn, Al, Ge, Sn, Mg, Ag, Tl, Nb, B, P, Zr, Ca, Sr, Ba, Mo, Ga and Mn, the first positive electrode active material contains Co, and satisfies 90≦a≦100, where a (mol %) represents a ratio of Co to all elements constituting the M in General Composition Formula (1), the second positive electrode active material contains Co, Ni and Mn, and satisfies 10≦b≦35, 45≦c≦65 and 10≦d≦35, where b (mol %), c (mol %) and d (mol %) respectively represent ratios of Co, Ni and Mn to all elements constituting the M in General Composition Formula (1), a ratio of the first positive electrode active material to all positive electrode active materials contained in the positive electrode mixture layer is 20 mass % or more, the positive electrode mixture layer has a density of 3.1 g/cm 3 or less, the negative electrode includes a negative electrode mixture layer, the negative electrode mixture layer contains, as negative electrode active materials, graphite and a material containing Si and O as constituent elements represented by General Composition Formula (2):
SiO x   (2)

where x satisfies 0.5≦x≦1.5, and the material containing Si and O as constituent elements forms a composite with a carbon material.

12 . The non-aqueous secondary battery according to claim 11 , wherein a ratio of the composite contained in the negative electrode mixture layer is 2 mass % or more and 20 mass % or less to a total mass of the composite and the graphite.

13 . The non-aqueous secondary battery according to claim 11 , wherein the positive electrode mixture layer has a density of 2.5 g/cm 3 or more.

14 . The non-aqueous secondary battery according to claim 11 , wherein a sum of a thickness of the positive electrode mixture layer and a thickness of the negative electrode mixture layer is 200 μm or less.

15 . The non-aqueous secondary battery according to claim 11 ,
wherein the separator includes a porous layer (I) and a porous layer (II), the porous layer (I) contains a resin having a melting point of 140° C. or lower, and the porous layer (II) contains a resin that does not melt at a temperature of 150° C. or lower or an inorganic filler having a heat resistant temperature of 150° C. or higher.

16 . A non-aqueous secondary battery comprising:
a positive electrode; a negative electrode; a non-aqueous electrolyte; and a separator, wherein the positive electrode includes a positive electrode current collector and a positive electrode mixture layer, a conductive layer containing a conductive material is formed on a surface of the positive electrode current collector, the positive electrode mixture layer contains a first positive electrode active material and a second positive electrode active material each composed of a lithium-containing composite oxide represented by General Composition Formula (1):
Li 1+y MO 2   (1)

where y satisfies −0.15≦y≦0.15, and M represents a single element or an element group including at least one selected from Co, Ni, Ti, Cr, Fe, Cu, Zn, Al, Ge, Sn, Mg, Ag, Tl, Nb, B, P, Zr, Ca, Sr, Ba, Mo, Ga and Mn, the first positive electrode active material contains Co, and satisfies 90≦a≦100, where a (mol %) represents a ratio of Co to all elements constituting the M in General Composition Formula (1), the second positive electrode active material contains Co, Ni and Mn, and satisfies 10≦b≦35, 45≦c≦65 and 10≦d≦35, where b (mol %), c (mol %) and d (mol %) respectively represent ratios of Co, Ni and Mn to all elements constituting the M in General Composition Formula (1), a ratio of the first positive electrode active material to all positive electrode active materials contained in the positive electrode mixture layer is 20 mass % or more, and the positive electrode mixture layer has a density of 3.1 g/cm 3 or less.

17 . The non-aqueous secondary battery according to claim 16 , wherein the positive electrode mixture layer has a density of 2.5 g/cm 3 or more.

18 . The non-aqueous secondary battery according to claim 16 , wherein the conductive material is at least one selected from the group consisting of carbon blacks, carbon nanotubes, vapor phase growth carbon fibers, hardly graphitizable carbon, artificial graphite, and natural graphite.

19 . The non-aqueous secondary battery according to claim 16 ,
wherein the negative electrode includes a negative electrode mixture layer, and a sum of a thickness of the positive electrode mixture layer and a thickness of the negative electrode mixture layer is 200 μm or less.

20 . The non-aqueous secondary battery according to claim 16 ,
wherein the separator includes a porous layer (I) and a porous layer (II), the porous layer (I) contains a resin having a melting point of 140° C. or lower, and the porous layer (II) contains a resin that does not melt at a temperature of 150° C. or lower or an inorganic filler having a heat resistant temperature of 150° C. or higher.

Assignees

• Hitachi Maxell

Inventors

• TAKAICHI Yuta
• Kawabe Keisuke
• HAMATANI Yoshimi

Classifications

• H01M50/451

  comprising layers of only organic material and layers containing inorganic material · CPC title

• H01M50/417

  Polyolefins · CPC title

• H01M10/0569

  characterised by the solvents · CPC title

• H01M4/525 Primary

  of mixed oxides or hydroxides containing iron, cobalt or nickel for inserting or intercalating light metals, e.g. LiNiO2, LiCoO2 or LiCoOxFy · CPC title

• H01M4/505

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