Method for microwave synthesis of lithium iron phosphate material

Abstract

The invention relates to a method for microwave synthesis of a lithium iron phosphate material, and particularly discloses a method for microwave synthesis of a lithium iron phosphate material by using a waste battery. The method specifically comprises the steps of (1) selecting a waste lithium iron phosphate battery, carrying out discharge treatment on the waste lithium iron phosphate battery, and disassembling to obtain a positive plate; (2) calcining the positive plate obtained in the step (1) at the temperature of 300-500 DEG C for 1-10 hours, taking out the positive plate after the temperature is reduced to room temperature, and mechanically vibrating the positive plate to enable lithium iron phosphate to fall off from a current collector aluminum foil to obtain lithium iron phosphatepowder; and (3) mixing the lithium iron phosphate powder, a lithium source, an iron source, a phosphorus source and a carbon source, performing ball milling, performing microwave treatment for 10-100seconds, and repeating the steps of ball milling and microwave treatment until lithium iron phosphate particles are obtained. The process is simple to operate, the process is easy to control, the energy consumption is low, the method is environmentally friendly, secondary pollutants are not generated, and meanwhile, the repaired lithium iron phosphate material can be reused for producing lithiumion batteries.

Description

technical field [0001] The invention relates to the field of electrochemistry, in particular to a method for synthesizing lithium iron phosphate by treating waste batteries by a microwave method. Background technique [0002] Since the commercialization of lithium-ion batteries, due to their high operating voltage, high energy density, long cycle life, easy portability, and good safety performance, they have been widely used in portable electronic devices such as mobile phones, notebook computers, cameras, and electric vehicles. Therefore, a large number of lithium-ion batteries will be produced every year, and a large number of scrapped batteries will be produced every year accordingly. [0003] Although some companies have begun to pay attention to the resource utilization of waste lithium batteries, my country has not yet established a national waste battery recycling and treatment system. The waste lithium battery recycling technology adopted by individual enterprises i...

AI Technical Summary

Problems solved by technology

The waste lithium battery recycling technology adopted by individual enterprises is relatively backward, with low efficiency and easy to produce secondary pollution. The recycling object is single, and the comprehensive utilization rate of battery residual value is low.

In the research on the recycling of waste lithium batteries, recycling technologies are still mostly in the laboratory stage, and there are problems of lagging behind in industrialization or poor practicability

[0004] At present, the recovery and regeneration process of lithium iron phosphate mainly adopts fire method and wet method. The technology of fire method synthesis technology is not very mature at the same time, and will produce a large amount of toxic gas at the same time, while the main purpose of wet method is to use acid-soluble alkali leaching. The valuable metals in the battery are finally recovered. This process requires a large amount of acid-base reagents, serious environmental pollution and long reaction time, which is highly corrosive to the reaction equipment.