A kind of recovery method of lithium iron phosphate positive plate with low energy consumption and low Al content

Abstract

The invention provides a method for recovering lithium iron phosphate cathode sheets with low energy consumption and low Al content. In this method, firstly, the positive electrode sheet to be recovered is crushed into coarse particles with a crusher to obtain a crushed material with a particle size of 1-15mm; Cool out of the furnace to obtain calcined materials; then crush the calcined materials into powder with a pulverizer to obtain secondary crushed materials with a D50 of 50 μm to 80 μm; finally classify the secondary crushed materials with an airflow classifier to obtain positive electrode materials with an Al content of less than 200 ppm . The invention can separate and recover positive electrode materials from aluminum foil through primary crushing, calcination, secondary crushing and airflow classification. And in this process, through the control of process parameters such as the particle size of the primary particle, the calcination temperature and time, and the particle size of the secondary particle, the recovery of the positive electrode material with low energy consumption and low Al content can be realized.

Description

technical field

[0001] The invention relates to the technical field of recycling lithium-ion waste batteries, in particular to a method for recycling lithium iron phosphate cathode sheets with low energy consumption and low Al content. Background technique

[0002] In recent years, lithium-ion batteries have been widely used in automotive power batteries, energy storage power systems, and power tools, electric bicycles, electric motorcycles, military equipment, aerospace, 3C and other fields, and the number is very large. However, as the service life of lithium-ion batteries approaches, a large number of decommissioned and scrapped batteries will be produced. For the recovery of these decommissioned and scrapped lithium-ion batteries, fire or wet processes were mainly used to recover precious metals, such as Li and Co. However, this method not only has a low utilization rate of various materials in lithium-ion batteries, but also causes great pollution to the environment, a...

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