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US 8,709,656 B2Granted
Cathode material for lithium ion secondary battery and lithium ion secondary battery using it
AssigneeHitachi, Ltd.
InventorsHiroaki Konishi, Toyotaka Yuasa
Life of this patent
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Abstract
A lithium ion secondary battery according to the present invention uses a cathode material obtained by mixing a first cathode active substance represented by a compositional formula: Lix1Nia1Mnb1COc1O2 (in which 0.2≦x1≦1.2, 0.6≦a1≦0.9, 0.05≦b1≦0.3, 0.05≦c1≦0.3, and a1+b1+c1=1.0); and a second cathode active substance represented by a compositional formula: Lix2Nia2Mnb2COc2MdO2 (in which 0.2≦x2≦1.2, 0.7≦a2≦0.9, 0.05≦b2≦0.3, 0.05≦c2≦0.3, M=Mo, W, 0≦d≦0.06, and a2+b2+c2+d=1.0).
Claims7
A cathode material for a lithium ion secondary battery, comprising:
- a first cathode active substance represented by a compositional formula:
- Lix1Nia1Mnb1Coc1O2 (in which 0.2≦x1≦1.2, 0.6≦a1≦0.9, 0.05≦b1≦0.3, 0.05≦c1≦0.3, and a1+b1+c1=1.0);
- and
- a second cathode active substance represented by a compositional formula:
- Lix2Nia2Mnb2COc2MdO2 (in which 0.2≦x2≦1.2, 0.7≦a2≦0.9, 0.05≦b2≦0.3, 0.05≦c2≦0.3, M=Mo, W, 0≦d≦0.06, and a2+b2+c2+d=1.0),
- wherein an amount of the first cathode active substance contained in the cathode material is set to 30 to 70% by mass.
3 more elements
Dependencies are inferred from the claim text.