A method for manufacturing metal phosphate hydrate nanoparticles wherein metal reactants are selected from metal precursors of transition metals,phosphate precursors are selected from: Trisodium phosphate Na.sub.3PO.sub.4, disodium phosphate Na.sub.2HPO.sub.4, phosphoric acid H.sub.3PO.sub.4 and hypophosphoric acid H.sub.4P.sub.2O.sub.6, wherein said method comprises the following step of a reaction medium comprising at least a metal reactant, a phosphate precursor and a solvent, is submitted to a solvothermal treatment at a pressure superior to 50 MPa, and at a temperature of from 100 to 350° C.

The present invention relates to hollow nanocoils having a three-dimensional helical structure in the form of a hollow tube and a method of manufacturing the same.

The present invention provides a method of synthesizing metal nanocoils into inorganic hollow nanocoils using the galvanic replacement reaction and an electrochemical reaction including the Kirkendall effect. The inorganic hollow nanocoil structure body of the present invention can be applied to various fields such as sensors, catalysts, batteries, or gene delivery and therapy using a large surface area.

The present disclosure belongs to technical field of cathode materials of lithium batteries, and discloses a preparation method of high-safety high-capacity lithium manganese iron phosphate. The method includes the steps: (1) synthesizing a ferrous phosphate precursor through a co-precipitation process, and sintering to obtain an anhydrous ferrous phosphate precursor; (2) synthesizing a manganese phosphate precursor through co-precipitation process, and sintering to obtain an anhydrous manganese phosphate precursor; (3) adding lithium phosphate and deionized water into anhydrous ferrous phosphate precursor, and performing ball milling and wet sanding to obtain slurry A; (4) adding lithium phosphate, an organic carbon source, a dispersant, a dopant and deionized water into anhydrous manganese phosphate precursor, and performing ball milling and wet sanding to obtain slurry B; and (5) mixing slurry A with slurry B, and performing ball milling, spray drying, sintering and air jet pulverization to obtain high-safety high-capacity lithium manganese iron phosphate.

The present invention relates to strongly coloured manganese ferrite colour pigments, to the production thereof and to the use thereof.

A preparation method of battery composite material includes steps of providing a manganese-contained compound, phosphoric acid, a lithium-contained compound, a carbon source, and deionized water; processing a reaction of the manganese-contained compound, the phosphoric acid, and a portion of the deionized water to produce a first product; placing the first product at a first temperature for at least a first time period to produce a first precursor, wherein the chemical formula of the first precursor is written by Mn.sub.5(HPO.sub.4).sub.2(PO.sub.4).sub.2(H.sub.2O).sub.4; and processing a reaction of at least the first precursor, the lithium-contained compound, and another portion of the deionized water, adding the carbon source, and then calcining to produce battery composite material. Therefore, the preparation time is shortened, the energy consuming is reduced, the phase forming of the precursor is more stable, and the advantages of reducing the cost of preparation and enhancing the quality of products are achieved.

The present invention provides a cost-effective method of synthesizing phosphate salt of a metal such as Fe and Mn that can be used for electrode active material of a lithium secondary battery. A precipitation reaction is first carried out to produce a solid salt of the metal having a lower valence value, e.g. Fe(II) and Mn(II). The solid salt is then purified before it is oxidized to form the target phosphate salt of the metal having a higher valence value, e.g. Fe(III) and Mn(III). The invention exhibits numerous technical merits such as easier operation, higher purity, and less consumption of washing water, among others.

An electrode material for a lithium-ion secondary battery of the present invention includes particles which are made of LiFe.sub.xMn.sub.1-w-x-y-zMg.sub.yCa.sub.zA.sub.wPO.sub.4, have an orthorhombic crystal structure, and have a space group of Pmna, in which a mis-fit value [(1−(b2×c2)/(b1×c1))×100] of a be plane which is computed from lattice constants b1 and c1 of the LiFe.sub.xMn.sub.1-w-x-y-zMg.sub.yCa.sub.zA.sub.wPO.sub.4 and lattice constants b2 and c2 of Fe.sub.xMn.sub.1-w-x-y-zMg.sub.yCa.sub.zA.sub.wPO.sub.4 obtained by deintercalating Li from LiFe.sub.xMn.sub.1-w-x-y-zMg.sub.yCa.sub.zA.sub.wPO.sub.4 by means of an oxidation treatment using nitrosonium tetrafluoroborate in acetonitrile is 1.32% or more and 1.85% or less.

The present disclosure belongs to the field of battery materials, and discloses a coated nickel-rich ternary material and a preparation method and application thereof. The coated nickel-rich ternary material has a chemical formula of LiNi.sub.xCo.sub.yMn.sub.zO.sub.2.Math.a[M.sub.3(PO.sub.4).sub.2.Math.bH.sub.2O], Where 0.6≤x≤0.8, 0.1≤y≤0.2, 0.1≤z≤0.2, x+y+z=1, 0.01≤a≤0.03, 3≤b≤8, M.sub.3(PO.sub.4).sub.2.Math.bH.sub.2O is at least one selected from the group consisting of nickel phosphate, cobalt phosphate and manganese phosphate; the coated nickel-rich ternary material has a flower-like structure. The preparation method of the present disclosure provides phosphate ions through the prepared phosphate solution, performs coating in a liquid phase environment, and synthesizes the precursor simultaneously by microwave hydrothermal synthesis, which is beneficial to the full contact between the phosphates and the precursor, and ensures the surface of the nickel-rich ternary precursor is uniformly coated with the phosphates. The method is simple and has good coating effect.

The invention provides a method for preparing lithium manganese iron phosphate, which includes the following steps: S1: mixing a manganese source and/or an iron source in solid phase to obtain a first mixture; S2: sintering the first mixture in solid phase at 300° C. to 1200° C. to obtain a manganese iron oxide (MnxFe1−x−y)mOn; S3: mixing the manganese iron oxide (MnxFe1−x−y)mOn with a lithium source, a phosphorus source, and optionally a manganese source and/or an iron source in solid phase to obtain a second mixture; and S4: sintering the second mixture in solid phase at 350° C. to 900° C. to obtain lithium manganese iron phosphate LiMnxFe1−x−yPO4, wherein 0≤x≤1, and 0≤y≤1. The method of the present invention can be used to prepare a lithium manganese iron phosphate material with high tap density, long cycle life, low costs, and high cost-effectiveness.

An electrode material including a carbonaceous-coated electrode active material having primary particles of an electrode active material and secondary particles that are aggregates of the primary particles, and a carbonaceous film that coats the primary particles of the electrode active material and the secondary particles that are the aggregates of the primary particles, in which a proportion of a volume of micropores having a micropore diameter of 50 nm or less in a volume of micropores having a micropore diameter of 300 nm or less, which is obtained using a nitrogen adsorption method, is 40% or more.