Abstract: Disclosed is a positive active material for a rechargeable lithium battery and a method of preparing the same. The positive active material includes lithium nickel manganese oxide and lithium manganese oxide. The weight ratio of the lithium manganese oxides to the lithium nickel manganese oxides is less than 1. In this method, lithium nickel cobalt oxide is mixed with lithium manganese oxides. At this time, the weight ratio of lithium manganese oxides to lithium nickel cobalt oxides is less than 1. The resulting mixture is added with a binder and then the resulting mixture is heat-treated at a low-temperature.

Abstract: A lithium composite oxide (LiaNi(1-x-y)CoxMyO2, where M is at least one metal atom selected from the group consisting of Al, Ca, Mg and B, a=0.97˜1.05, x=0.1˜0.3, and y=0˜0.05), prepared by a method including the steps of: (a) coprecipitating a Ni—Co composite hydroxide by adding an aqueous ammonia solution as a complexing agent, and an alkaline solution as a pH-adjusting agent, to an aqueous mixed solution containing a cobalt salt and a nickel salt; (b) adding lithium hydroxide to the composite hydroxide and thermally treating the mixture at 280˜420° C.; and (c) thermally treating the resultant of the step (b) at 650˜750° C. The average particle diameter of the lithium composite oxide decreases, or the tap density thereof increases, depending on the coprecipitation time. When the lithium composite oxide is used as a positive electrode active material, a lithium ion secondary cell having a high capacity can be obtained.

Abstract: Disclosed is a positive active material of for a rechargeable lithium battery and a method of preparing the same.

Abstract: A positive active material for a rechargeable lithium battery is provided. The positive active material is characterized by formulas 1 or 2. The positive active material exhibits good cycle life characteristics and high capacity. LiaNi1−(x+y+z)CoxMyNzOb  (1) (where 0.95≦a≦1.05, 0.01≦x+y≦0.5, 0<y≦0.1, 0≦z≦0.05, 1.7≦b ≦2.3, M is at least one metal selected from the group consisting of La and Ce, and N is at least one metal selected from the group consisting of Mg and Sr.) LiaNbNi1−(x+y)CoxMyOz  (2) (where 0.95≦a+b≦1.05, 0≦b≦0.5, 0.01≦x+y≦0.5, <0≦0.1, 1.7≦z ≦2.3, M is at least one metal selected from the group consisting of La and Ce, and N is Mg.

Abstract: Disclosed is a positive active material for a rechargeable lithium battery and a method of preparing the same. The positive active material includes a LiCoO2 core and a metal selected from a group consisting of Al, Mg, Sn, Ca, Ti, Mn and mixtures thereof. The metal has a concentration gradient from a surface of the core to a center of the core.

Abstract: Disclosed is a positive active material for a rechargeable lithium battery having a higher concentration of Co in the surface portion than in the central portion. The surface portion is a region from the outermost surface to a depth of 10 microns. The positive active material is represented Li1+xMn2−yCoyO4 wherein −0.1<x0.1 and 0<y<0.1. The positive active material is produced by obtaining a sol or gel cobalt material by mixing lithium salts, cobalt salts, an alcohol and chelating agents and heating the mixture, mixing the sol or gel cobalt material with LiMn2O4, and heat-treating the resulting mixture.

Abstract: A lithium composite oxide (LiaNi(1−x−y)CoxMyO2, where M is at least one metal atom selected from the group consisting of Al, Ca, Mg and B, a=0.97˜1.05, x=0.1˜0.3, and y=0˜0.05), prepared by a method including the steps of: (a) coprecipitating a Ni—Co composite hydroxide by adding an aqueous ammonia solution as a complexing agent, and an alkaline solution as a pH-adjusting agent, to an aqueous mixed solution containing a cobalt salt and a nickel salt; (b) adding lithium hydroxide to the composite hydroxide and thermally treating the mixture at 280˜420° C.; and (c) thermally treating the resultant of the step (b) at 650˜750° C. The average particle diameter of the lithium composite oxide decreases, or the tap density thereof increases, depending on the coprecipitation time. When the lithium composite oxide is used as a positive electrode active material, a lithium ion secondary cell having a high capacity can be obtained.

Abstract: A process for preparing an active material for a cathode of a lithium ion battery comprising the steps of: dissolving lithium hydroxide, manganese acetate as starting materials into water to form a solution; adding a chelating agent into the solution; producing gel or liquid phase by evaporating the solution; and producing a powder by raising temperature at the rate of 5.about.20 .degree. C./min, combusting and calcinating the gel or liquid phase at 300.about.400 .degree. C. during 2.about.3 hours is disclosed.

Abstract: A glass-polymer composite electrolyte includes a glass electrolyte having a lithium compound and at least one compound selected from P.sub.2 S.sub.5, SiS.sub.2 or GeS.sub.2, and a polymer electrolyte comprising a lithium salt.