Recovery method of LiFePO4 positive electrode material

Abstract

Belonging to the technical field of lithium ion batteries, the invention provides a recovery method of an LiFePO4 positive electrode material. The method is characterized by comprising the steps of: (1) crushing an LiFePO4 positive electrode waste sheet, then mixing the crushed LiFePO4 positive electrode waste sheet with a mixed solution of DMF and water, performing rapid stirring, conducting vacuum pumping and filtration to obtain black powder and filtrate, and collecting black powder; (2) mixing the obtained filtrate with an aluminum foil, conducting rapid stirring, separating the black powder from the aluminum foil again, and carrying out vacuum pumping and filtration so as to obtain black powder and filtrate, collecting the black powder, and repeating the step (2) until the residue on the aluminum foil is little; (3) mixing the collected black powder, and then performing vacuum drying; (4) crushing the dried black powder and conducting separation to obtain a mixture of LiFePO4 positive electrode powder and carbon; and (5) subjecting the separated mixture of LiFePO4 positive electrode powder and carbon to heat treatment. The method provided by the invention has the characteristics of green and environmental protection, and no pollution, the recovered LiFePO4 positive electrode material has considerable electrochemical performance, the recovery rate is high, and the cost is saved.

Description

technical field [0001] The invention relates to the technical field of lithium ion batteries, in particular to a LiFePO 4 Recycling method of cathode material. Background technique [0002] At present, the research on lithium battery recycling is not very deep. During the research process, it was found that some of these methods are only suitable for the recovery of digital lithium-ion batteries containing cobalt, nickel and other elements, such as: LiCoO2, Ni-Co-Mn ternary and other types, such methods are not possible after research. It is used to recycle lithium-ion batteries that do not contain cobalt, nickel and other elements, but this recycling method is very troublesome, the problems encountered in the process are very complicated, and it will increase the cost, and it is useless to meet the requirements of high efficiency and high utilization , It is easy to cause damage to the environment and ecosystem. Therefore, it is necessary to find a recycling method with ...

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Problems solved by technology

But its disadvantage is that the energy consumed is very high, and the electrolyte and shell in the battery will emit some toxic gases and wastes due to combustion.

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