Lithium secondary battery
AssigneeSanyo Electric Co., Ltd.
InventorsTakuya Sunagawa, Hiroshi Watanabe, Toshiyuki Nohma, Koji Nishio
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Abstract
The invention provides a positive electrode active material for a lithium secondary battery including a composite oxide powder having a median diameter of 3.0 through 20.0 μm and a content of particles with a grain size of 1 μm or less of 10% by volume or less and being represented by a composition formula, LiaCobMcNi1-b-cO2, in which M is at least one element selected from the group consisting of B, Mg, Al, Si, Ca, Sc, Ti, V, Cr, Mn, Fe, Cu, Zn, Ga, Ge, Y, Nb, Mo, Ru, Rh, Pd, Ag, Cd, In and Sn; 0≦a≦1.2; 0.01≦b≦0.4; 0.01≦c≦0.4; and 0.02≦b+c≦0.5. Thus, the lithium secondary battery can be improved in its charge-discharge cycle characteristic.
Claims16
A lithium secondary battery comprising, as a positive electrode active material, a composite oxide powder having a median diameter of 3.0 through 20.0 μm and a content of particles with a grain size of 1 μm or less of 10% by volume or less and being represented by a composition formula, LiaCobMcNi1-b-cO2, in which M is at least one element selected from the group consisting of Ca, Sc, V, Cu, Zn, Ga, Ge, Y, Nb, Ru, Rh, Pd, Ag, Cd, In and Sn;
- 0≦a≦1.2;
- 0.01≦b≦0.4;
- 0.01≦c≦0.4;
- and 0.02≦b+c≦0.5.
A lithium secondary battery comprising, as a positive electrode active material, a composite oxide powder having a median diameter of 6.0 through 15.0 μm and a content of particles with a grain size of 1 μm or less of 10% by volume or less and being represented by a composition formula, LiaCobMcNi1-b-cO2, in which M is at least one element selected from the group consisting of Ca, Sc, V, Cu, Zn, Ga, Ge, Y, Nb, Ru, Rh, Pd, Ag, Cd, In and Sn;
- 0≦a≦1.2;
- 0.01≦b≦0.4;
- 0.01≦c≦0.4;
- and 0.02≦b+c≦0.5.
A lithium secondary battery comprising, as a positive electrode active material, a composite oxide powder having a median diameter of 3.0 through 20.0 μm and a content of particles with a grain size of 1 μm or less of 10% by volume or less and being represented by a composition formula, LiaCobMcNi1-b-cO2, in which M is at least one element selected from the group consisting of Ca, V, Cu, Zn and Ga;
- 0≦a≦1.2;
- 0.01≦b≦0.4;
- 0.01≦c≦0.4;
- and 0.02≦b+c≦0.5.
A lithium secondary battery comprising, as a positive electrode active material, a composite oxide powder having a median diameter of 6.0 through 15.0 μm and a content of particles with a grain size of 1 μm or less of 10% by volume or less and being represented by a composition formula, LiaCobMcNi1-b-cO2, in which M is at least one element selected from the group consisting of Ca, V, Cu, Zn and Ga;
- 0≦a≦1.2;
- 0.01≦b≦0.4;
- 0.01≦c≦0.4;
- and 0.02≦b+c≦0.5.
A positive electrode active material, a composite oxide powder having a median diameter of 3.0 through 20.0 μm and a content of particles with a grain size of 1 μm or less of 10% by volume or less and being represented by a composition formula, LiaCobMcNi1-b-cO2, in which M is at least one element selected from the group consisting of Ca, Sc, V, Cu, Zn, Ga, Ge, Y, Nb, Ru, Rh, Pd, Ag, Cd, In and Sn;
- 0≦a≦1.2;
- 0.01≦b≦0.4;
- 0.01≦c≦0.4;
- and 0.02≦b+c≦0.5.
A positive electrode active material, a composite oxide powder having a median diameter of 6.0 through 15.0 μm and a content of particles with a grain size of 1 μm or less of 10% by volume or less and being represented by a composition formula, LiaCobMcNi1-b-cO2, in which M is at least one element selected from the group consisting of Ca, Sc, V, Cu, Zn, Ga, Ge, Y, Nb, Ru, Rh, Pd, Ag, Cd, In and Sn;
- 0≦a≦1.2;
- 0.01≦b≦0.4;
- 0.01≦c≦0.4;
- and 0.02≦b+c≦0.5.
A positive electrode active material, a composite oxide powder having a median diameter of 3.0 through 20.0 μm and a content of particles with a grain size of 1 μm or less of 10% by volume or less and being represented by a composition formula, LiaCobMcNi1-b-cO2, in which M is at least one element selected from the group consisting of Ca, V, Cu, Zn and Ga;
- 0≦a≦1.2;
- 0.01≦b≦0.4;
- 0.01≦c≦0.4;
- and 0.02≦b+c≦0.5.
A positive electrode active material, a composite oxide powder having a median diameter of 6.0 through 15.0 μm and a content of particles with a grain size of 1 μm or less of 10% by volume or less and being represented by a composition formula, LiaCobMcNi1-b-cO2, in which M is at least one element selected from the group consisting of Ca, V, Cu, Zn and Ga;
- 0≦a≦1.2;
- 0.01≦b≦0.4;
- 0.01≦c≦0.4;
- and 0.02≦b+c≦0.5.
Dependencies are inferred from the claim text.