Method for preparing flaky lithium vanadium phosphate cathode material of lithium ion battery

Abstract

The invention relates to a method for preparing a flaky lithium vanadium phosphate cathode material of a lithium ion battery, comprising the following steps: 1) respectively preparing a LiOH.H2O aqueous solution and a glycine aqueous solution; 2) adding NH4VO3 to deionized water, and then adding H3PO4 to obtain a brownish red solution; 3) adding the LiOH.H2O solution to the brownish red solution, adding the glycine aqueous solution after the mixture is evenly stirred, adding a specified volume of SuperP, stirring for 1 hour, regulating the pH value of the mixed solution to 2-5 with ammonia water, and drying to obtain presoma powders; and 4) under the argon protection, sintering the presoma powders to obtain the flaky lithium vanadium phosphate cathode material. The preparation method is simple in processes; the prepared lithium vanadium phosphate cathode material is used for the lithium ion battery, and has good cyclical stability, high charge and discharge capacity, excellent high-multiplying power performance, and high material electroconductibility; and the prepared lithium vanadium phosphate cathode material is suitable for power supplies of portable power tools, battery-operated motor cycles, electric automobiles and the like.

Description

technical field [0001] The invention relates to a preparation method of a layered sheet-shaped lithium vanadium phosphate cathode material for a lithium ion battery, and belongs to the field of lithium ion batteries. Background technique [0002] Lithium-ion batteries have the advantages of high energy density, long cycle life and low self-discharge rate, and are widely used in electric vehicles, satellites, aerospace and military fields. Cathode materials are an important part of lithium-ion batteries, research and development of high-performance cathode materials has become the key to the development of lithium-ion batteries. [0003] At present, lithium-ion battery cathode materials mainly include lithium cobalt oxide, lithium manganese oxide and lithium iron phosphate, etc. Lithium cobalt oxide was the earliest used as lithium-ion battery cathode material, and the technology is mature, but cobalt resources are scarce and cost High, high toxicity, poor security. Lithium...

AI Technical Summary

Problems solved by technology

Although the solid-phase method is simple to operate, the primary particle size of the product is large and the cycle stability is poor; in the sol-gel method, the gel molecules are small, the raw materials are fully mixed, and the product quality is high, but the gel preparation process is too cumbersome ; The hydrothermal method requires the pressure of the reactor to reach more than 20 atmospheres, the investment in industrial production equipment is large, and the safety hazard is large

Most of the lithium vanadium phosphate positive electrode materials prepared by the above methods are in the form of powder particles, which also limits the development of high-performance lithium-ion battery technology.

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