Patent ID: 6531220
Filing Date: 2003-03-11
Classification: H01M,Y02E,Y10T

Abstract:
A positive active material for a rechargeable lithium battery comprising:a manganese-based compound selected from the group consisting of compounds represented by formulas 1 to 6; and a metal oxide coated on the manganese-based compound, LixMn1âˆ’xMâ€²xA2â€ƒâ€ƒ(1) LixMn1âˆ’xMâ€²xO2âˆ’zAzâ€ƒâ€ƒ(2) LixMn1âˆ’xâˆ’yMâ€²xMâ€³yA2â€ƒâ€ƒ(3) LixMn2âˆ’xMâ€²xO4â€ƒâ€ƒ(4) LixMn2âˆ’xMâ€²xO4âˆ’zAzâ€ƒâ€ƒ(5) LixMn2âˆ’xâˆ’yMâ€²xMâ€³yA4â€ƒâ€ƒ(6) (where, 0.01&lE;x&lE;0.1, 0.01&lE;y&lE;0.1, 0.01&lE;z&lE;0.5, Mâ€² is at least one semi-metal selected from the group consisting of Si, B, Ti, Ga, Ge and Al, Mâ€³ is at least one transition metal or lanthanide metal selected from the group consisting of Al, Cr, Co, Mg, La, Ce, Sr and V, and A is selected from the group consisting of O, F, S and P.