Positive active material for rechargeable lithium battery and method of preparing same
AssigneeSamsung SDI Co., Ltd.
InventorsHo-Jin Kweon, Hyun-Sook Jung, Yong-Chul Park, Geun-Bae Kim
Life of this patent
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Abstract
Disclosed is a positive active material for a rechargeable lithium battery. The positive active material includes at least one compound represented by formulas 1 to 4 andl a metal oxide or composite metal oxide layer formed on the compound. 1 LixNi1−yMnyF2 (1) LixNi1−yMnyS2 (2) LixNi1−y−zMnyMzO2−aFa (3) LixNi1−y−zMnyMzO2−aSa (4) (where M is selected from the group consisting of Co, Mg, Fe, Sr, Ti, B, Si, Ga, Al, Sc, Y, La, Ce, Pr, Nd, Pm, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, Lu, Ac, Th, Pa, U, Np, IPu, Am, Cm, Bk, Cf, Es, Fm, Md, No and Lr, 0.95≦x≦1.1, 0≦y≦0.99, 0≦,z≦0.5, and 0≦a≦0.5)
Claims9
A positive active material for a rechargeable lithium battery comprising:
- at least one compound selected from the group consisting of formulas 1 to 4;
- and
- a metal oxide or composite metal oxide layer formed on the compound.
- 4 LixNi1−yMnyF2 (1) LixNi1−yMnyS2 (2) LixNi1−y−zMnyMzO2−aFa (3) LixNi1−y−zMnyMzO2−aSa (4)
- (where M is selected from the group consisting of Co, Mg, Fe, Sr, Ti, B, Si, Ga, Al, Sc, Y, La, Ce, Pr, Nd, Pm, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, Lu, Ac, Th, Pa, U, Np, Pu, Am, Cm, Bk, Cf, Es, Fm, Md, No and Lr, 0.95≦x≦1.1, 0≦y≦0.99, 0≦;z≦0.5, and 0≦a≦0.5)
A method of preparing a positive active material for a rechargeable lithium battery, the positive active material including at least one selected from the group consisting of formulas 1 to 4 and being coated with metal oxide or composite metal oxide, comprising the steps of:
- preparing at least one compound selected from the group consisting of formulas 1 to 4;
- coating the compound with a metal alkoxide solution, an organic solution of metal salt or an aqueous solution of metal salt;
- and
- heat-treating the coated compound.
- 5 LixNi1−yMnyF2 (1) LixNi1−yMnyS2 (2) LixNi1−y−zMnyMzO2−aFa (3) LixNi1−y−zMnyMzO2−aSa (4)
- (where M is selected from the group consisting of Co, Mg, Fe, Sr, Ti, B, Si, Ga, Al, Sc, Y, La, Ce, Pr, Nd, Pm, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, Lu, Ac, Th, Pa, U, Np, IPu, Am, Cm, Bk, Cf, Es, Fm, Md, No and Lr, 0.95≦x≦1.1, 0≦y≦0.99, 0≦z≦0.5, and 0≦a≦0.5)
Dependencies are inferred from the claim text.