Preparation method of phosphorus-doped lithium nickel cobalt ferrite

Abstract

The invention discloses a preparation method of phosphorus-doped lithium nickel cobalt ferrite. The preparation method comprises the steps: adding a nickel-cobalt solution into an ammonium bicarbonatesolution, reacting, filtering and washing to obtain nickel-cobalt carbonate precipitate; adding the nickel-cobalt carbonate precipitate into a phosphoric acid solution, and stirring for reaction to obtain a phosphate radical doped nickel-cobalt precipitate; adding the phosphate radical doped nickel-cobalt precipitate into a polyethylene glycol solution and a lithium bicarbonate solution, stirring, slurrying, carrying out spray drying, and carrying out primary calcination to obtain a primary calcined material; adding ferrous salt and lithium salt into the primary calcined material, then addingwater, adding an ammonium carbonate solution and an acid solution after grinding and levigating are conducted, filtering, washing and drying, and obtaining a reaction material; and carrying out high-temperature calcination on the reaction material in an air atmosphere to obtain a secondary calcined material, carrying out jet milling on the secondary calcined material, screening to remove iron, and carrying out vacuum packaging to obtain the phosphorus-doped lithium nickel cobalt ferrite. The conductivity can be improved through phosphorus-doped lithium nickel cobalt oxide so that the structure stability is better, and the product capacity and the cycle performance are excellent.

Description

technical field [0001] The invention relates to a preparation method of phosphorus-doped nickel-cobalt lithium ferrite, which belongs to the field of lithium battery new energy materials. Background technique [0002] The main materials of lithium batteries include positive and negative electrode materials, electrolyte and diaphragm. Generally speaking, the positive electrode material occupies a core position in the composition of lithium ion battery products. The positive electrode material is the key material that determines the performance of lithium ion batteries. It has been developed A variety of cathode materials. Such as LiCOO 2 , LiMn 2 0 4 , LiNi0 2 and LiFePO 4 , but these cathode materials themselves have many defects, lithium cobalt oxide is expensive, LiMn 2 0 4 There is a serious capacity fading problem. Especially in high temperature environment, the attenuation is more serious, LiFePO 4 Low cost, stable discharge, good thermal stability, and environme...

AI Technical Summary

Problems solved by technology

However, the current nickel-cobalt lithium ferrite is generally realized by co-precipitation. The nickel-cobalt-iron is evenly distributed on the nickel-cobalt lithium-iron oxide particles, but the structures of lithium nickel oxide and lithium cobalt oxide are unstable, while the structure of lithium iron oxide If the stability is good, the co-precipitation can not give full play to the advantages of the three

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