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 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: Disclosed is active material for a positive electrode used in lithium secondary batteries of Formula 1 below and a method of manufacturing the active material. The active material includes large particles of 1 to 25 &mgr;m formed of a plurality of minute particles of 0.4 to 0.7 &mgr;m. The method includes the steps of adding a chelating agent to a mixture derived by dissolving lithium salt, nickel salt and cobalt salt in a solvent to a molar ratio of 0.95-1.06: 0.5-1:0-0.5; producing a gel by heating the mixture; for precursor by thermally decomposing the gel; and heat treating the precursor. LixNi1−yCoyO2  [Formula 1] where x is between 0.95 and 1.06, and y is between 0 and 0.5.

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.

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.

Abstract: A method comprising of continuously injecting an aqueous solution of nickel salt, an aqueous solution of aluminium salt, an alkali aqueous solution and ammonia into a reactor under constant temperature, mixing the above solution and continuously withdrawing, can prepare Ni-Al hydroxycarbonate having a high density and a globular shape.

Abstract: A call processing method in a radio telephone, in which receiving and transmitting operations are carried out using a spread spectrum communication system in accordance with a time division duplexing, the radio telephone including a base set wire-connected to a public switching network and a plurality of handsets radio-connected to the base set and allocated with different pseudo noise codes, respectively.

Abstract: The present invention relates to a cathode assembly employing a cermet pellet and a method for manufacturing the same. The cathode assembly of the present invention has a good quality such as a low work function and an enhanced life span as compared with the conventional cathode assembly. Also, since the method for manufacturing a cermet pellet is more simplified than that of the cermet thin film, the cathode assembly employing the cermet pellet according to the present invention can be manufactured with ease and at a low cost.

Abstract: An active material for a nickel electrode includes a double hydroxycarbonate having the formula Ni.sub.1-2x M.sub.2x (OH).sub.2 (CO.sub.3).sub.x .multidot.nH.sub.2 O, where 0.05<x<0.2, 0.05<n<4, and M is a Group IIIB element and containing 1-40 at % of a III B group element in a solid solution, based on the weight of nickel, and 1-20 wt % of a conductive enhancer which is at least one substance selected from the group consisting of Co and cobalt compound, based on the weight of the double hydroxycarbonate, so that a nickel electrode having a high capacity, increased life time, high charge/discharge velocity and enhanced utility of the active material can be produced. Alkaline secondary cells can be manufactured using the nickel electrode.

Abstract: A direct heating cathode for electron guns and a process for producing such a cathode are disclosed. The above direct heating cathode achieves a high current density, extends the expected life span and simplifies the cathode producing process. In the process for producing the above cathode, powdered iridium (Ir) as a basic ingredient is mixed with powdered cerium (Ce) as a subsidiary ingredient at a given mixing ratio into a powdered metal mixture. The powdered metal mixture in turn is applied with a mechanical impact through high energy ball milling, thereby being mechanically alloyed into alloy powder. The alloy powder is compressed with a given pressure, thereby being formed into an alloy pellet. The alloy pellet in turn is heated to remove residual gases from the pellet. Thereafter, the electron emitting performance of the pellet is tested.

Abstract: A cathode for an electron tube includes a base metal containing nickel as a major component and an electron-emissive material layer which is formed on the base metal and comprises an alkaline earth metal oxide including barium oxide as its main component, wherein the electron-emissive material layer further comprises a lanthanum-magnesium-manganese oxide. The cathode of the present invention is fully interchangeable with conventional oxide cathodes and has a longer lifetimes and an improved cut-off drift characteristic.

Abstract: A thermion emitting oxide cathode comprising a metal cap and a cathode sleeve, the metal cap being coated with a thermion emitting material layer containing a barium-based alkaline earth metal, wherein the thermion emitting material layer is made of a titanate of the barium-based alkaline earth metal. The thermion emitting oxide cathode is made by mixing a titanium tetrachloride (TiCl.sub.4) with an aqueous solution of barium-strontium-calcium dichloride ?(Ba--Sr--Ca)Cl.sub.2 !, dropping the mixture into an oxalate solution of 80.degree. C., thereby precipitating a barium-strontium-calcium titanate hydrate ?(Ba--Sr--Ca)TiO(C.sub.2 O.sub.4).sub.2.4H.sub.2 O!, and treating the precipitated barium-strontium-calcium titanate hydrate at a temperature of 500.degree. to 700.degree. C. to remove a plurality of water molecules, thereby producing a suspension of barium-strontium-calcium titanate ?(Ba--Sr--Ca)TiO.sub.3 !.

Abstract: A positive electrode and a negative electrode for an alkaline storage battery and manufacturing methods thereof are provided. The positive electrode includes a nickel porous body formed on a plate, active material particles containing nickel hydroxide and additives filled up into the nickel porous body, a conductive layer coated on the surface of active material particle, and a protective layer coated on the surface of the conductive layer, for increasing the binding force between the active material particles and preventing the contact between the active material particles and an electrolytic aqueous solution. The negative electrode comprises hydrogen storage metal particles.

Abstract: A hydrogen occluded alloy and a process for producing the above alloy are disclosed. The above process mechanically forms the hydrogen occluded alloy having improved initial discharging characteristics. In the above process, either a powdered LaNi.sub.5 alloy or rare earth metals, such as la, Ce, Pr and Nd, and a powdered CaCu.sub.5 alloy of Mm-Mn-Ni-Al-Co alloys is mixed with a powdered Laves alloy of Zr-Mn-V-Cr-Ni alloys into a powdered alloy mixture. Thereafter, the alloy mixture is applied with a mechanical impact by a high energy ball mill with an attritor, thereby mechanically forming the hydrogen occluded alloy. The above process easily controls the manganese component while producing the hydrogen occluded alloy through the mechanical alloying.

Abstract: A positive electrode and a negative electrode for an alkaline storage battery and manufacturing methods thereof are provided. The positive electrode includes a nickel porous body formed on a plate, active material particles containing nickel hydroxide and additives filled up into the nickel porous body, a conductive layer coated on the surface of active material particle, and a protective layer coated on the surface of the conductive layer, for increasing the binding force between the active material particles and preventing the contact between the active material particles and an electrolytic aqueous solution.