Preparation method for homogeneous-phase lithium iron phosphate battery

Abstract

The invention relates to a preparation method for a homogeneous-phase lithium iron phosphate battery and belongs to the field of battery materials. The preparation method for the homogeneous-phase lithium iron phosphate battery is provided for solving the problems of higher preparation cost, low rate of finished batteries and difficulty in ensuring reaction consistency in reaction processes of the existing lithium iron phosphate battery preparation. The preparation method comprises the steps of adding nickel nitrate, aluminium nitrate and yellow powder obtained by calcining urea into absolute ethyl alcohol, cooling and filtering to obtain filter residue, drying and calcining the filter residue, adding water to ferric nitrate, phosphorus nitrate and calcined filter residue and stirring, ultrasonic dispersing, and then filtering and drying, soaking the already dried solid into a mixed solution, and baking, after baking, putting into a high temperature furnace at the nitric oxide reducing atmosphere, and baking for 4-6 hours to obtain the homogeneous-phase lithium iron phosphate battery. The homogeneous-phase lithium iron phosphate battery prepared by the method is uniform in size of internal particles, less in particle aggregation, and good in consistency; and in addition, the preparation method is simple in process and low in cost.

Description

Technical field [0001] The invention relates to a method for preparing a homogeneous lithium iron phosphate battery, which belongs to the field of battery materials. Background technique [0002] With the shortage of primary energy sources and the increasingly serious environmental pollution, green and environmentally friendly lithium-ion secondary batteries, as a reusable resource, have gradually entered people’s field of vision and have become the focus of attention. They have been developed to relieve energy tensions. And environmental protection issues, and are widely used in the drive of portable electronic equipment, energy storage equipment and electric vehicles. Lithium iron phosphate battery refers to a lithium ion battery that uses lithium iron phosphate as a positive electrode material. In terms of material principle, lithium iron phosphate is also an intercalation / deintercalation process, which is exactly the same as lithium cobaltate and lithium manganate. Compared...

AI Technical Summary

Problems solved by technology

[0004] The technical problem mainly solved by the present invention: Aiming at the disadvantages that the preparation cost of lithium iron phosphate is relatively high, the battery yield is low, and it is difficult to ensure the consistency of the reaction in the reaction process, a homogeneous lithium iron phosphate battery is provided. The preparation method comprises adding yellow powder obtained by nickel nitrate, aluminum nitrate and calcined urea into absolute ethanol, cooling and filtering the obtained filter residue, drying and calcining, adding water and stirring ferric nitrate, phosphorus nitrate and calcined filter residue, After ultrasonic dispersion, filter and dry, put the dried solid into the mixed solution, soak and bake, after baking, put it in a high-temperature furnace with a reducing atmosphere of nitric oxide, and roast for 4 to 6 hours. The internal particle size of the obtained lithium iron phosphate battery is relatively uniform, the particles are less agglomerated, the consistency is good, and the process is simple and the cost is low