Cathode active material and non-aqueous electrolyte secondary battery
AssigneeSony Corporation
InventorsTakashi Sato, Takahisa Ishimatsu, Kei Yonezawa, Yoshikatsu Yamamoto
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Abstract
A cathode with a cathode active material is provided. The cathode active material is obtained by mixing a zirconium-containing lithium cobalt composite oxide containing zirconium as a sub-component element in a first lithium cobalt composite oxide expressed by a formula LitCoMsO2 (where M is at least one kind of element selected from Fe, V, Cr, Ti, Mg, Al, B, and Ca; 0≦s≦0.03; 0.05≦t≦1.15), and a second lithium cobalt composite oxide expressed by a formula LixCol-yAyO2 (where A is at least one kind of element selected from Mg and Al; 0.05≦x≦1.15; 0≦y≦0.03).
Claims7
A cathode active material comprising:
- a first composite oxide;
- and
- a second composite oxide mixed with said first composite oxide,
- wherein said first composite oxide is a zirconium-containing lithium cobalt composite oxide containing zirconium as a sub-component element in a first lithium cobalt composite oxide, and said first lithium cobalt composite oxide is LitCoMsO2, where M denotes at least one kind of element selected from iron, vanadium, chromium, titanium, magnesium, aluminum, boron, and calcium, where s is a value within a range of 0≦s≦0.03, and where t is a value within a range of 0.05≦t≦1.15,
- wherein said second composite oxide is a second lithium cobalt composite oxide expressed by LixCol-yAyO2, where A denotes at least one kind of element selected from magnesium and aluminum, where x is a value within a range of 0.05≦x≦1.15, and where y is a value within a range of 0≦y≦0.03,
- wherein a content of said zirconium ranges from 0.0005 to 0.01 as a mole ratio Zr/Co to cobalt in the first lithium cobalt composite oxide, and
- wherein a content of the second lithium cobalt composite oxide ranges from 10 wt % to 40 wt %.
A non-aqueous electrolyte secondary battery comprising:
- a cathode having a cathode active material, the cathode active material including a first composite oxide and a second composite oxide mixed together;
- an anode;
- a non-aqueous electrolyte;
- and
- a separator,
- wherein said first composite oxide is a zirconium-containing lithium cobalt composite oxide containing zirconium as a sub-component element in a first lithium cobalt composite oxide, and said first lithium cobalt composite oxide is LitCoMsO2, where M denotes at least one kind of element selected from iron, vanadium, chromium, titanium, magnesium, aluminum, boron, and calcium, where s is a value within a range of 0≦s≦0.03, and where t is a value within a range of 0.05≦t≦1.15,
- wherein said second composite oxide is a second lithium cobalt composite oxide expressed by LixCol-yAyO2, where A denotes at least one kind of element selected from magnesium and aluminum, where x is a value within a range of 0.05≦x≦1.15, and where y is a value within a range of 0≦y≦0.03,
- wherein a content of said zirconium ranges from 0.0005 or more to 0.01 or less as a mole ratio Zr/Co to cobalt in the lithium cobalt composite oxide, and
- wherein a content of the second lithium cobalt composite oxide ranges from 10 wt % to 40 wt %.
Dependencies are inferred from the claim text.