A high-nickel cathode material for lithium ion batteries and a preparation method and application thereof. The high-nickel cathode material contains elements shown in and constituting the chemical formula 1 thereof Li.sub.1+aNi.sub.bMn.sub.cA.sub.dO.sub.2, where 0.01≤a≤0.24, 0.79<b≤0.96, 0.01<c≤0.20, 0<d≤0.06; and A is selected from any one or two or more of Mn, Co, Al, Zr, Y, Rb, Cs, W, Ce, Mo, Ba, Ti, Mg, Ta, Nb, Ca, V, Sc, Sr and B, or from a phosphorus-containing compound containing at least one of Ti, Al, Mg, Zr, La and Li. The high-nickel cathode material of the lithium ion battery of the present invention has better cycling performance, higher capacity, and a relatively small increase in resistance during cycling of the battery.

A cathode configured to use oxygen as a cathode active material includes: a porous film including a metal oxide, where a porosity of the porous film is about 50 volume percent to about 95 volume percent, based on a total volume of the porous film, and an amount of an organic component in the porous film is 0 to about 2 weight percent, based on a total weight of the porous film.

The present invention relates to a method of preparing a positive electrode active material for a lithium secondary battery and the positive electrode active material for the lithium secondary battery prepared thereby, and more specifically, to a method of preparing a positive electrode active material for a lithium secondary battery, the method comprising doping or coating the positive electrode active material for the lithium secondary battery with a predetermined metal oxide, and the positive electrode active material for the lithium secondary battery which is prepared thereby and has a reduced amount of residual lithium.

Disclosed herein are doped perovskite oxides. The doped perovskite oxides may be used as a cathode material in an electrochemical cell to electrochemically generate ammonia from N.sub.2. The doped perovskite oxides may be combined with nitride compounds, for instance iron nitride, to further increase the efficiency of the ammonia production.

Ce and Zn doped NiFe2O.sub.4 materials synthesized via a sol-gel method used as a catalyst. The NiFe.sub.2O.sub.4 catalysts doped with Ce and Zn exhibit distinctive electrocatalytic activity towards urea oxidation. The Ce and Zn-doped NiFe.sub.2O.sub.4 catalysts can play a critical role as catalytic moderators, accelerating charge transfer in the anodic part of the urea fuel cell (UFC) and potentially improving the efficiency and cost of UFCs. These materials provide a promising approach for developing novel, non-precious electrodes for next-generation fuel technologies.

The invention relates to a method for preparing a composite metal oxide hollow fibre. A certain stoichiometry of composite metal oxide raw material and a polymer binding agent are added to an organic solvent, and mixed mechanically to obtain an evenly dispersed spinning solution having a suitable viscosity. After defoaming treatment, the spinning solution is extruded through a spinneret and, after undergoing a certain dry spinning process, enters an external coagulation bath; during this period, a phase inversion process occurs and composite metal oxide hollow fibre blanks are formed. The blanks are immersed in the external coagulation bath and the organic solvent is displaced; after natural drying, the blanks undergo a heat treatment process; during this period, polymer burn off, in situ reaction, and in situ sintering processes occur to obtain the composite metal oxide hollow fibre.

The cathode active material is capable of reducing cathode resistance of a secondary battery by enhancing electron conductivity thereof without reducing discharge capacity of the secondary battery. The method for manufacturing a cathode active material includes: mixing transition metal-containing composite compound particles containing lanthanum with a lithium compound to obtain a lithium mixture; calcinating the lithium mixture at a temperature equal to or lower than the melting point of the lithium compound; and then subjecting the lithium mixture to main firing at a firing temperature within a range of 725° C. to 1000° C. Lithium carbonate is preferably used as the lithium compound, and in this case, the calcination temperature is within a range of 600° C. to 723° C. It is preferable to obtain the transition metal-containing composite compound particles containing lanthanum by a coprecipitation method and to uniformly disperse a lanthanum element in the particles.

Disclosed is a catalyst having a perovskite structure in the form of ABO.sub.3, in which the number of ion moles at the A site has an excess ratio compared to the number of ion moles at the B site. The present invention exhibits an oxygen catalytic activity improved by about 3 times in an oxygen evolution reaction and by about 40% in an oxygen reduction reaction, compared to those of an existing LaNiO.sub.3 perovskite catalyst. Further, since the metallic conductivity is not significantly changed compared to the existing LaNiO.sub.3 perovskite oxide, there is an advantage in that a carbon support need not be used when the present invention is used as a catalyst in a battery positive electrode.

A homogenously mixed metal manganese oxide. The mixed metal manganese oxide includes a homogenous mixture of manganese and at least two more metals. The additional metals may be cesium, nickel, copper, bismuth, cobalt, magnesium, iron, aluminum, scandium, vanadium, chromium, silver, gold, titanium, or, lead. A method of making the metal manganese oxide material includes mixing salts of manganese and the additional metals. The mixture may be activated and digested at an elevated temperature. Also, a battery having a cathode made from the homogenously mixed metal manganese oxide.

A method of forming a metal oxide material having a rod shape or polyhedral nanostructure includes preparing a first reverse micro-emulsion system comprising an aqueous precipitating agent dispersion and a second reverse micro-emulsion system containing an aqueous metal salt dispersion; combining the micro-emulsions together to initiate a reaction; allowing the reaction to continue to form a product mixture comprising a metal oxide gel and aqueous media; separating the metal oxide gel from the aqueous media; collecting the metal oxide gel; and calcining the metal oxide gel to form the metal oxide material. The metal oxide material corresponds to the chemical formula of La.sub.2M.sub.xNi.sub.1-xO.sub.4, Pr.sub.2-yA.sub.yNiO.sub.4, or La.sub.2-zD.sub.zNiO.sub.4, wherein M is copper, cobalt, iron, manganese, chromium, aluminum, or platinum; A is lanthanum or neodymium; D is calcium, barium or strontium; x ranges from 0 to 1; y ranges from 0 to 2; and z ranges from 0 to 0.25.