A material synthesis method may comprise: adding at least one liquid precursor solution to an atomizer device; generating by the atomizer device an aerosol comprising liquid droplets; transporting the aerosol to a reactive zone for evaporating one or more solvents from the aerosol; and collecting particles synthesized from at least evaporating the aerosol.

Disclosed herein is an improved cathode material prepared from high purity electrolytic manganese dioxide. Also disclosed is a method for preparing high purity MnO.sub.2 and converting MnO.sub.2 particles to Mn.sub.2O.sub.3.

To provide metal-containing trimanganese tetraoxide combined particles with which a metal-substituted lithium manganese oxide excellent as a cathode material for a lithium secondary battery can be obtained, and their production process. Metal-containing trimanganese tetraoxide combined particles containing a metal element (excluding lithium and manganese). Such metal-containing trimanganese tetraoxide combined particles can be obtained by a production process comprising a crystallization step of crystalizing a metal-substituted trimanganese tetraoxide not by means of metal-substituted manganese hydroxide from a manganese salt aqueous solution containing manganese ions and metal ions other than manganese.

A process for producing a lithium-manganese-oxide spinel material includes producing a raw lithium-manganese-oxide (LMO) material by means of combustion synthesis; optionally, subjecting the raw LMO material to microwave treatment, to obtain a treated material; annealing the raw LMO material or the treated material, to obtain an annealed material; and optionally, subjecting the annealed material to microwave treatment. At least one of the microwave treatments must take place.

The present application provides a positive electrode active material, a method for the preparation thereof and a positive electrode plate, a secondary battery and an electrical device containing the same. The positive electrode active material having a core-shell structure, comprising a core and a shell covering the core, wherein the core has a chemical formula of Li.sub.aA.sub.xMn.sub.1-yB.sub.yP.sub.1-zC.sub.zO.sub.4-nD.sub.n, the shell comprises a first cladding layer covering the core, and a second cladding layer covering the first cladding layer, wherein the first cladding layer comprises pyrophosphate MP.sub.2O.sub.7 and phosphate XPO.sub.4, and the second cladding layer comprises carbon. The positive electrode active material of the present application enables the secondary battery and electrical device to have a relatively high energy density, and good cycling performance, rate performance and safety performance.

Provided is a lithium secondary battery having excellent charge-discharge cycle performance at high temperatures and having low resistance and high power. A spinel-type lithium manganese oxide including a phosphate, the spinel-type lithium manganese oxide being represented by chemical formula: Li.sub.1+XMn.sub.2?X?YM.sub.YO.sub.4 (where 0.02?X?0.20, 0.05?Y?0.30, and M represents Al or Mg), wherein the volume of pores having a size of 0.6 ?m or less is 0.003 cm.sup.3/g or more and 0.2 cm.sup.3/g or less, and the relative standard deviation of size of secondary particles is 25% or more and 45% or less, a method for producing the spinel-type lithium manganese oxide and applications of the spinel-type lithium manganese oxide.

This invention provides lithium manganate which has a high output and is excellent in high-temperature stability. This invention relates to lithium manganate particles which are produced by mixing a lithium compound, a manganese compound, a Y compound and an A compound and then calcining the resulting mixture, and have a composition represented by the following chemical formula 1 and an average secondary particle diameter (D.sub.50) of 1 to 15 m, in which Y is at least one element selected from the group consisting of Al and Mg; A is a sintering aid element having a melting point of not higher than 850 C.; x and y satisfy 0.03x0.15 and 0y0.20, respectively; z is in the range of 0 to 2.5 mol % based on Mn, wherein the lithium manganate particles have a sulfur content of not more than 100 ppm.
Li.sub.1+xMn.sub.2-x-yY.sub.yO.sub.4zA(Chemical Formula 1)

Substituted -MnO.sub.2 compounds are provided, where a portion of the Mn is replaced by at least one alternative element. Electrochemical cells incorporating substituted -MnO.sub.2 into the cathode, as well as methods of preparing the substituted -MnO.sub.2, are also provided.

Provided is a method for manufacturing a slurry for a positive electrode of a nonaqueous electrolyte secondary battery containing an alkali metal complex oxide, the method making it possible to reliably deaerate surplus carbonic acid gas after an alkali component of a slurry containing the alkali metal complex oxide is neutralized within a short period of time. The method for manufacturing a slurry for a positive electrode of a nonaqueous electrolyte secondary battery includes a step of manufacturing an electrode slurry including a step of performing a neutralization treatment on an alkali component in the slurry by using inorganic carbon dissolved in a solvent of the slurry and a step of deaerating the inorganic carbon in the slurry as carbonic acid gas by causing cavitation.

Positive electrode active material particle powder includes lithium manganese oxide particle powder having Li and Mn as main components and a cubic spinel structure with an Fd-3m space group. The lithium manganese oxide particle powder is composed of secondary particles, which are aggregates of primary particles, an average particle diameter (D50) of the secondary particles being from 4 m to 20 m, and at least 80% of the primary particles exposed on surfaces of the secondary particles each have a polyhedral shape in which each (111) plane thereof is adjacent to at least one (100) plane thereof.