Recovery method of LiFePO4 positive electrode material

A recycling method and positive electrode material technology, applied in the field of lithium-ion batteries, can solve the problems of high energy consumption and achieve the effects of high recovery rate, cost saving and considerable electrochemical performance

Inactive Publication Date: 2016-02-24
百顺松涛(天津)动力电池科技发展有限公司
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Problems solved by technology

But its disadvantage is that the energy consumed is very high, and the electrolyte

Method used

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  • Recovery method of LiFePO4 positive electrode material
  • Recovery method of LiFePO4 positive electrode material
  • Recovery method of LiFePO4 positive electrode material

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Embodiment Construction

[0025] Such as figure 1 As shown, a LiFePO 4 A recovery method for positive electrode materials, comprising the steps of:

[0026] (1) LiFePO 4 After the positive electrode waste is crushed, pour it into a large beaker containing a mixed solution of 200mL DMF and water. The volume of DMF and water is 1:1. Stir rapidly for 0.5h. The black powder is separated from the aluminum foil to obtain a suspension, and vacuumize Filter to obtain black powder and filtrate, collect black powder;

[0027] (2) Add the filtrate and aluminum foil obtained in step (1) into a large beaker, stir rapidly for 0.5h, the black powder is separated from the aluminum foil again to obtain a suspension, and vacuum filtered to obtain black powder and filtrate, collect For black powder, repeat step (2) until there is little residue on the aluminum foil;

[0028] (3) Mix the black powder collected in the steps (1) and (2) and then vacuum dry, the vacuum drying temperature is 85°C, and the drying time is 0...

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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 ...

Claims

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Application Information

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IPC IPC(8): H01M10/54
CPCY02W30/84H01M10/54
Inventor 陈勇
Owner 百顺松涛(天津)动力电池科技发展有限公司
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