Positive active material for rechargeable lithium battery and method of preparing same
AssigneeSamsung Display Devices Co., Ltd.
InventorsHo-Jin Kweon, Geun-Bae Kim, Dong-Gon Park
Life of this patent
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Abstract
A positive active material for rechargeable lithium batteries includes an active material component processed from a manganese-based compound. The transition metal compound is selected from LixMnO2, LixMnF2, LixMnS2, LixMnO2-zFz, LixMnO2-xSz, LixMn1-yMyO2, LixMn1-yMyF2, LixMn1-yMyS2, LixMn1-yMyO2-zFz, LixMn1-yMyO2-zSz, LixMn2O4, LixMn2F4, LixMn2S4, LixMn2O4-zFz, LixMn2O4-zSz, LixMn2-yMyO4, LixMn2-yMyF4, LixMn2-yMyS4, LixMn2-yMyO4-zFz, or LixMn2-yMyO4-zSz where O<x≦1.5, 0.05≦y≦0.3, y≦1.0 and M is selected from Al, Co, Cr, Mg, Fe, La, Sr or Ce. A vanadium pentoxide is coated on the active material component.
Claims5
A positive active material for rechargeable lithium batteries, the positive active material comprising:
- an active material component processed from a manganese-based compound, the manganese-based compound being selected from the group consisting of LixMnO2, LixMnF2, LixMnS2, LixMnO2-zFz, LixMnO2-zSz, LixMn1-yMyO2, LixMn1-yMyF2, LixMn1-yMyS2, LixMn1-yMyO2-zFz, LixMn1-yMyO2-zSz, LixMn2O4, LixMn2F4, LixMn2S4, LixMn2O4-zFz, LixMn2O4-zSz, LixMn2-yMyO4, LixMn2-yMyF4, LixMn2-yMyS4, LixMn2-yMyO4-zFz, and LixMn 2-yMyO4-zSz where 0<x≦1.5, 0.05≦y≦0.3, z≦1.0 and M is selected from the group consisting of Al, Co, Cr, Mg, Fe, La, Sr and Ce;
- and
- a vanadium pentoxide (V2O5) coated on the active material component.
A method of preparing a positive active material for rechargeable lithium batteries, the method comprising the steps of:
- obtaining a powder from a source material, the source material being selected from the group consisting of LixMnO2, LixMnF2, LixMnS2, LixMnO2-zFz, LixMnO2-zSz, LixMn1-yMyO2, LixMn1-yMyF2, LixMn1-yMyS2, LixMn1-yMyO2-zFz, LixMn1-yMyO2-zSz, LixMn2O4, LixMn2F4, LixMn2S4, LixMn2O4-zFz, LixMn2O4-zSz, LixMn2-yMyO4, LixMn2-yMyF4, LixMn2-yMyS4, LixMn2-yMyO4-zFz, and LixMn2-yMyO4-zSz where 0<x≦1.5, 0.05≦y≦0.3, z≦1.0 and M is selected from the group consisting of Al, Co, Cr, Mg, Fe, La, Sr and Ce;
- coating the powder with a vanadium pentoxide aqueous solution or a vanadium pentoxide alcoholic solution to make an vanadium pentoxide solution-coated powder;
- and
- heat-treating the vanadium pentoxide solution-coated powder to prepare a vanadium pentoxide-coated active material.
Dependencies are inferred from the claim text.