37results about How to "Improve cathode performance" patented technology

A method of producing Liy[NixCo1−2xMnx]O2 wherein 0.025≦x≦0.5 and 0.9≦y≦1.3. The method includes mixing [NixCo1−2xMnx]OH2 with LiOH or Li2CO3 and one or both of alkali metal fluorides and boron compounds, preferably one or both of LiF and B2O3. The mixture is heated sufficiently to obtain a composition of Liy[NixCo1−2xMnx]O2 sufficiently dense for use in a lithium-ion battery cathode. Compositions so densified exhibit a minimum reversible volumetric energy characterized by the formula [1833−333x] measured in Wh / L.

A method for producing a cathode active material which produces a spinel type lithium manganese oxide expressed by a general formula: Li1+xMn2-x-yMeyPO4, as the cathode active material, (here, x is expressed by a relation of 0<=x<=0.15 and y is expressed by a relation of 0 C01D 15 / 02 H01M 4 / 04 1 19 31 2001 / 10 / 23 1350339 2002 / 5 / 22 1189959 2005 / 2 / 16 2005 / 2 / 16 2005 / 2 / 16 Sony Corp. Japan Sakai Hideki Fukuba Shigeshi Takahashi Kimio wang jie 11038 The Patent Agency of the Chinese Council for the Promotion of International Trade (CCPIT) No.1 Waidajie, Fuxingmen, Beijing 100086 Japan 2000 / 10 / 23 323214 / 2000

Subfluorinated carbonaceous materials obtained through direct fluorination of graphite or coke particles are provided. One set of subfluorinated carbonaceous materials has an average chemical composition CFx in which 0.63<x≦0.95, 0.66<x≦0.95 or 0.7<x≦0.95. The subfluorinated carbonaceous materials are capable of electrochemical performance superior to commercial CF at relatively high rates of discharge.

The present application relates to a metal oxide and synthesis of a lithium ion battery. Specifically, the present application selects a cobalt oxide compound, which uses Co3O4 as a main body, as a precursor of lithium cobalt oxide, and anion doping is performed in particles of Co3O4 to obtain a doped precursor for lithium cobalt oxide. The general formula of the precursor can be expressed as Co3(O1-yMy)4, where about 0<y<about 0.2, and wherein the anion M comprises at least one of F, P, S, Cl, N, As, Se, Br, Te, I or At. The lithium ion battery with a cathode made of lithium cobalt oxide material prepared by using the precursor presents good cycle stability in a high voltage charge-discharge environment.

The invention belongs to the field of solid oxide fuel cells, in particular relates to a solid oxide fuel cell structure and a preparation method thereof. The cell structure comprises a cell cathode layer, an electrolyte layer and a cell anode layer in sequence from top to bottom, wherein the cell cathode layer is divided into a PrBaCo2O5 layer and an LSM (La0.8S0.2MnO3) layer from top to bottom; the electrolyte layer is YSZ (Yttria Stabilized Zirconia); the cell anode layer is Ni-YSZ; and the thickness of the PrBaCo2O5 layer is 2-4 microns. Because PrBaCo2O5 has higher catalytic performance, oxygen diffusion coefficients, surface exchange coefficients and oxygen ion migration capability, the oxygen adsorbing capability and oxygen dissociating capability of a cathode can be improved by adopting a PrBaCo2O5-LSM / YSZ / Ni-YSZ structure and material system; and the solid oxide fuel cell structure has the characteristic of improving the cathode performance of the solid oxide fuel cells.

The invention discloses a Pt-Au@Pt core-shell structure fuel cell cathode catalyst and a preparation method thereof. The Pt-Au@Pt core-shell structure fuel cell cathode catalyst consists of a conductive carrier and Pt-Au@Pt core-shell structure nanoparticles. The preparation method comprises the following steps of: reducing a gold compound by using sodium borohydride to obtain Au nanoparticles, and loading the Au particles on the surface of a carbon carrier to obtain Au / C; and putting Au / C in a platinum compound water solution to obtain loaded-type Pt / Au alloy nanoparticles after Pt is subjected to spontaneous reductive deposition on the Au surface, depositing a Cu atom monolayer on the surface of the Pt-Au alloy nanoparticles by using an underpotential deposition method and then displacing the Cu atom monolayer with Pt to obtain the Pt-Au@Pt core-shell structure fuel cell cathode catalyst. The catalyst prepared by using the preparation method disclosed by the invention is high in catalytic activity and stability and low in cost relative to a pure Pt catalyst; and the preparation method is simple and convenient, mild in condition and easy to operate and can be used for solving the problem that a core-shell structure catalyst prepared by using a conventional chemical reduction method is high in Pt agglomeration degree on the surface and a catalyst prepared by using a single underpotential deposition method is low in Pt coverage degree on the surface.

A novel method to produce ALD films disposed on powders is disclosed. Examples include the formation of a cobalt doped zirconia (CDZ), hafnia, and cobalt doped hafnia (CDH) films on lanthanum strontium cobalt iron oxide (LSCF) powder for solid oxide fuel cell cathodes. The coated powders are sintered into porous cathodes that have utility for preventing the migration of cations in the powder to the surface of the sintered cathode and / or other performance enhancing attributes.

The invention discloses an intermediate temperature solid oxide fuel battery composite cathode and a preparation method thereof, and belongs to the field of chemical power solid oxide fuel battery materials. The invention solves the problem that the conventional cathode materials are not suitable for working under the condition of intermediate temperature. The composite cathode material is composed of Ca2Fe1.4Co0.6O5 and a solid dielectric which is Ce0.8Gd0.2O1.95 or Ce0.8Sm0.2O1.95. The method comprises the following steps of: 1, mixing the Ca2Fe1.4Co0.6O5 and the solid dielectric, adding terpilenol and uniformly mixing the three materials to obtain a mixed material; 2, coating the mixed material on the surface of the dielectric, and placing the dielectric in an oven for drying; and 3, sintering the dielectric to obtain the intermediate temperature solid oxide fuel battery composite cathode material on the surface of the dielectric. The cathode has the advantages of high electro-catalytic activity and low polarization resistance in the temperature range of 500 to 700 DEG C.