Recovery method of waste lithium iron phosphate battery positive electrode material

A technology of lithium iron phosphate battery and cathode material, which is applied in battery recycling, waste collector recycling, secondary battery and other directions, can solve the problems of poor recycling effect of iron and phosphorus elements, and achieve low cost, simple operation and environmental friendliness. Effect

Inactive Publication Date: 2020-11-13
曲靖市华祥科技有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In view of this, the present invention aims to provide a method for recycling the positive electrode material of the waste lithium iron phosphate battery, so as to solve the problem in the prior art that the recycling effect of iron and phosphorus elements in the waste lithium iron phosphate positive electrode material is not good

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  • Recovery method of waste lithium iron phosphate battery positive electrode material

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Effect test

Embodiment 1

[0029] A method for recycling the positive electrode material of a waste lithium iron phosphate battery, comprising the steps of:

[0030] (1) After the waste lithium iron phosphate battery has been discharged with residual power, disassemble the battery, separate the positive plate, add N-methylpyrrolidone to the positive plate to dissolve the binder, separate the current collector, and clean the rest of the solid Filter, wash, and dry the waste to obtain waste cathode materials;

[0031] Take 10g of the above waste positive electrode material and add 50mL, 20wt% nitric acid aqueous solution to dissolve, filter to obtain the first filtrate;

[0032] (2) Heat the above-mentioned first filtrate at 50°C for 2h to completely oxidize the ferrous ions in the first filtrate, then add 4mL of ammonia water to adjust the pH of the system to 2, and continue to heat the reaction at 70°C for 1h, filter, obtaining the first filter residue and lithium-containing filtrate; concentrating the...

Embodiment 2

[0036]A method for recycling the positive electrode material of a waste lithium iron phosphate battery, comprising the steps of:

[0037] (1) extract the waste lithium iron phosphate positive electrode material according to the method of Example 1; take 15g of the waste lithium iron phosphate positive electrode material, add 15mL, 30wt% nitric acid solution to dissolve, filter to obtain the first filtrate;

[0038] (2) Heat the above first filtrate at 80°C for 2.5h to completely oxidize the ferrous ions in the first filtrate, then add 3mL of ammonia water to adjust the pH of the solution to 1.5, continue heating and reacting at 80°C for 3h, and filter to obtain The first filter residue and lithium-containing filtrate;

[0039] According to the method of Example 1, the first filter residue was washed 3 times with a shear emulsification pump to obtain high-purity ferric phosphate, and the lithium-containing filtrate was concentrated for later use;

[0040] (3) Liquid-phase synt...

Embodiment 3

[0042] A method for recycling the positive electrode material of a waste lithium iron phosphate battery, comprising the steps of:

[0043] (1) extract the waste lithium iron phosphate positive electrode material according to the method of Example 1; take 12g of the waste lithium iron phosphate positive electrode material, add 40mL, 10wt% nitric acid solution to dissolve, filter to obtain the first filtrate;

[0044] (2) Heat the above first filtrate at 90°C for 3h to completely oxidize the ferrous ions in the first filtrate, then add 5mL of ammonia water to adjust the pH of the solution to 1, continue heating and reacting at 60°C for 2h, and filter to obtain the first - filter residue and lithium-containing filtrate;

[0045] According to the method of Example 1, the first filter residue was washed 3 times with a shear emulsification pump to obtain high-purity ferric phosphate, and then heat-treated at 300°C for 4 hours to transform into crystalline ferric phosphate; the lithi...

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Abstract

The invention provides a recovery method of a waste lithium iron phosphate battery positive electrode material. The recovery method comprises: (1) removing a binder from a positive electrode sheet obtained by disassembling a waste lithium iron phosphate battery, separating out a current collector to obtain a waste positive electrode material, dissolving the waste positive electrode material with nitric acid, and filtering to obtain a first filtrate; and (2) heating the first filtrate at 50-90 DEG C for 1-4 hours to completely oxidize ferrous ions in the first filtrate, adding ammonia water toadjust the pH value of the system to 1-2, continuously heating at 60-90 DEG C for 1-4 hours, filtering to obtain a first filter residue and a lithium-containing filtrate; and washing the first filterresidue for multiple times by adopting a shearing emulsification pump to obtain high-purity iron phosphate. According to the method, when the first filtrate is directly heated, ferrous ions can be completely oxidized, an oxidizing agent does not need to be added, and then the ferrous ions are converted into high-purity iron phosphate. The method is simple to operate, low in cost and environment-friendly.

Description

technical field [0001] The invention relates to the technical field of recycling waste batteries, in particular to a method for recycling positive electrode materials of waste lithium iron phosphate batteries. Background technique [0002] Lithium-ion batteries with lithium iron phosphate as the positive electrode material are widely used as power batteries for electric vehicles and other electric tools, and the number of waste lithium iron phosphate batteries is also increasing. Therefore, the effective recycling and reuse of waste lithium iron phosphate batteries has dual significance of economic value and social benefit. [0003] The recovery method of the existing waste lithium iron phosphate positive electrode material is usually to add acid to dissolve the waste lithium iron phosphate positive electrode material first, and then add an oxidant to oxidize the ferrous ion in the solution to prepare iron phosphate, but usually there is a large amount of oxidant, Problems ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B25/37H01M10/0525H01M10/54
CPCC01B25/375C01P2006/80H01M10/0525H01M10/54Y02E60/10Y02W30/84
Inventor 孔令涌徐浩
Owner 曲靖市华祥科技有限公司
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