Method for recovering and recycling waste positive electrode material during production process of lithium iron phosphate battery

Abstract

The invention discloses a method for recovering and recycling a waste positive electrode material during production process of a lithium iron phosphate battery. The method comprises the following steps of firstly, placing a lithium iron phosphate positive plate which is obtained by recycling in an alkaline solution, and separating an aluminum foil from the alkaline solution after the aluminum foil is completely separated; secondly, filtering and washing a lithium iron phosphate positive electrode mixed material in the alkaline solution, and then performing drying, ball-milling and sieving; and finally, immersing sieved lithium iron phosphate positive electrode mixed material powder in an organic solvent, performing stirring to remove a binding agent in the mixed material, performing filtering and washing, and performing thermal treatment such as roasting and calcination after drying to obtain a lithium iron phosphate positive electrode material with excellent performance. By the method, waste lithium iron phosphate can be recovered to acquire electrical property equivalent to that of a newly-prepared product, the aluminum foil can be reserved to the greatest extent and is convenient to recycle by an aluminum factory, the thermal treatment temperature required during the whole process is relatively low, and the process is simple and environment friendly.

Description

technical field [0001] The invention relates to the field of processing and recycling of lithium-ion battery waste materials, in particular to a method for recycling, repairing and reusing positive electrode waste materials in the production process of lithium iron phosphate batteries. Background technique [0002] Since the world's first commercial lithium-ion battery was introduced to the market by Sony of Japan in 1991, the lithium-ion battery industry has experienced more than 20 years of development. Secondary batteries have developed into the preferred batteries for 3C electronic products, electric vehicles and energy storage. [0003] In recent years, with the decrease of fossil resources and the seriousness of environmental problems such as smog, the development of electric vehicles has been highly valued by governments of various countries. The key to the development of electric vehicles lies in batteries. Lithium-ion battery has become an ideal power source for a...

AI Technical Summary

Problems solved by technology

The high temperature performance, cycle performance and storage performance of lithium manganate are poor, and the service life of the battery pack is short

In terms of vehicle safety design, China's new energy vehicles use ternary lithium batteries as power batteries, and there are certain safety hazards

The deoxidation temperature of the ternary material is 200°C, and the heat release energy exceeds 800J / g. The ternary lithium battery cannot pass the acupuncture test, which shows that the ternary battery is prone to safety accidents in the case of an internal short circuit.

This method does not consider the recovery of aluminum foil during the recycling process, and the oxidation of lithium iron phosphate will be caused under the condition of higher temperature roasting, resulting in the performance of the obtained lithium iron phosphate material being significantly inferior to that of the genuine iron phosphate material

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