Abstract: A method for preparing nano iron phosphate with low sulfur content. The method may include: S1: mixing a phosphorus source and an iron source to obtain a raw material solution, then adding alkali and a surfactant, adjusting a pH, and stirring and reacting to obtain an iron phosphate dihydrate slurry, S2: adding phosphoric acid solution into the iron phosphate dihydrate slurry, adjusting the pH, heating and stirring for aging, and filtering to obtain iron phosphate dihydrate, S3: adding water into the iron phosphate dihydrate for slurrying, and grinding to obtain a ground slurry; and S4: adding the ground slurry into a washing solution to wash, carrying out solid-liquid separation, and calcining a solid phase to obtain the nano iron phosphate with low sulfur content.

Abstract: The present disclosure discloses a method for recycling iron phosphate waste and use thereof. The method includes: mixing the iron phosphate waste with an acid liquid for dissolution to obtain an iron-phosphorus solution; taking a small portion of the iron-phosphorus solution to prepare an iron phosphate precipitating agent; adding the iron phosphate precipitating agent to a remaining portion of the iron-phosphorus solution to react to obtain an iron phosphate dihydrate precipitate; and keeping a portion of the iron phosphate dihydrate precipitate as a precipitating agent for a reaction in a subsequent batch, and preparing a remaining portion of the iron phosphate dihydrate precipitate into anhydrous iron phosphate. In the present disclosure, an iron phosphate precipitating agent is prepared and used for the subsequent preparation of iron phosphate, and iron phosphate obtained in each preparation can be used for the next preparation of iron phosphate.

Abstract: Disclosed are a pre-lithiated lithium ion positive electrode material, a preparation method therefor and use thereof. The lithium ion positive electrode material has a chemical formula of Li2O/[A(3-x)Mex]1/3-LiAO2, wherein A comprises M, and wherein M is at least one of Ni, Co, and Mn; and wherein Me is at least one of Ni, Mn, Al, Mg, Ti, Zr, Y, Mo, W, Na, Ce, Cr, Zn or Fe; and wherein 0<x<0.1. The material is co-doped with multiple elements, and these elements act synergistically to inhibit the irreversible phase change at a high voltage and improve the stability of the structure of a substrate. The spinel phase A(3-x)MexO4 structure contains the doping elements, which work together to improve the interfacial activity of the material and introduce more electrochemically active sites.

Abstract: The invention belongs to the technical field of lithium ion battery materials, and discloses a fast ionic conductor coated lithium-transition metal oxide material having a chemical formula of (1?x)Li1+a (Ni(1?m?n)ConMnm) 1?bMbO2·xLicAldTieM?fM?g (PO4)3 and a preparation method thereof. The fast ionic conductor coated lithium-transition metal oxide material of the present invention has lower impedance, excellent cycle performance and safety performance under high voltage, especially when the charging voltage is greater than 4.62V, 4.65V, or higher. The Lithium-transition metal oxide can be obtained by a primary calcination, and the final product of lithium-transition metal oxide material coated with fast ionic conductor can be obtained by a secondary calcination.

Abstract: The present invention provides a preparation method and application of lithium iron phosphate cathode material, comprising the following steps: (1) Dry mixing an iron source, a phosphorus source, a lithium source, a carbon source and additives and fine grinding to obtain a mixed material; (2) Performing first calcination to the mixed material, and then pulverize to obtain the pulverized material; (3) Perform the second calcination to the pulverized material, while introducing a gasifiable organic carbon source, and then cooling to obtain a lithium iron phosphate cathode material. The invention uses high-efficiency mixing equipment for a one-step mixing and fine grinding of the raw materials, followed by the first calcination and pulverizing, and then performing a second calcination. The gasifiable organic carbon source is used to supplement carbon by forming a carbon coating, so that it has a better carbon coating layer and particle morphology.

Abstract: Disclosed are a sagger for sintering lithium composite transition metal oxide and a preparation method thereof. The sagger includes a substrate layer and a shallow layer on a surface of the substrate layer, and a coating layer. The substrate layer is prepared from the following raw materials: silicon carbide, magnesia-alumina spinel, aluminum oxide-magnesium oxide-yttrium oxide composite fiber, zircon powder and a binding agent; the shallow layer is prepared from the following raw materials: silicon carbide, magnesia-alumina spinel, aluminum oxide-titanium oxide composite fiber, yttrium oxide-zirconium oxide composite fiber and a binding agent; and the coating layer is prepared from the following raw materials: silicon carbide, magnesia-alumina spinel, magnesium oxide, zirconium oxide fiber, lithium composite transition metal oxide powder and a binding agent. The sagger of the present disclosure has properties of good corrosion resistance and a small coefficient of thermal expansion.

Abstract: Disclosed are a pre-lithiated lithium ion positive electrode material, a preparation method therefor and use thereof. The lithium ion positive electrode material has a chemical formula of Li2O/[A(3-x)Mex]1/3-LiAO2, wherein A comprises M, and wherein M is at least one of Ni, Co, and Mn; and wherein Me is at least one of Ni, Mn, Al, Mg, Ti, Zr, Y, Mo, W, Na, Ce, Cr, Zn or Fe; and wherein 0 < × < 0.1. The material is co-doped with multiple elements, and these elements act synergistically to inhibit the irreversible phase change at a high voltage and improve the stability of the structure of a substrate. The spinel phase A(3-x)MexO4 structure contains the doping elements, which work together to improve the interfacial activity of the material and introduce more electrochemically active sites.