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Regeneration method of lithium iron phosphate in retired lithium battery

A lithium iron phosphate and lithium iron phosphate battery technology, which is applied in secondary batteries, battery electrodes, battery recycling, etc., can solve the problems of potential safety hazards, poor performance of lithium batteries, poor conductivity and cycle performance, and achieve excellent cycle performance , Youke capacity, and the effect of environmental protection in the regeneration process

Pending Publication Date: 2020-07-10
余姚市鑫和电池材料有限公司
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

[0004] Such as CN103825064B, it directly recycles the positive electrode material after high-temperature treatment, and makes it into a battery again. The performance of the lithium battery obtained by this method is poor, and there is a potential safety hazard; To improve its performance to a certain extent, but its conductivity and cycle performance are still poor; or to recover iron and lithium elements after dissolution, this method is likely to cause secondary pollution and the utilization rate of raw materials is low

Method used

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  • Regeneration method of lithium iron phosphate in retired lithium battery
  • Regeneration method of lithium iron phosphate in retired lithium battery

Examples

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Effect test

Embodiment 1

[0049] A method for regenerating lithium iron phosphate in a decommissioned lithium battery, said method comprising the following steps:

[0050] Disassemble the discarded lithium iron phosphate battery after complete discharge, and dismantle it in a glove box to separate the positive electrode material, place the positive electrode material in absolute ethanol for ultrasonic cleaning for 15 minutes, and centrifuge to remove a small amount of current collector residual components , followed by drying at 60°C for 2h, crushing and grinding to a particle size of ≤1mm to obtain a semi-finished product of lithium iron phosphate, 1000g of semi-finished product of lithium iron phosphate and 65g of 1500 mesh aluminum powder and 35g of B-mMPCFs fiber (2.66wt% boron doped mesophase pitch-based graphite fibers, the fiber length is 0.4-0.5 μm), and then placed in 2000g of absolute ethanol for wet ball milling for 1 hour to obtain a mixed slurry, which was pre-dried at 60°C until the water ...

Embodiment 2

[0052] A method for regenerating lithium iron phosphate in a decommissioned lithium battery, said method comprising the following steps:

[0053]Disassemble the discarded lithium iron phosphate battery after complete discharge, and dismantle it in a glove box to separate the positive electrode material, place the positive electrode material in absolute ethanol for ultrasonic cleaning for 15 minutes, and centrifuge to remove a small amount of current collector residual components , followed by drying at 60°C for 2 hours, crushing and grinding to a particle size ≤ 1mm to obtain a semi-finished product of lithium iron phosphate, 1000g of semi-finished product of lithium iron phosphate and 55g of 1500 mesh aluminum powder and 45g of B-mMPCFs fiber (2.66wt% boron doped mesophase pitch-based graphite fibers, the fiber length is 0.4-0.5 μm), and then placed in 2000g of absolute ethanol for wet ball milling for 1 hour to obtain a mixed slurry, which was pre-dried at 60°C until the wate...

Embodiment 3

[0055] A method for regenerating lithium iron phosphate in a decommissioned lithium battery, said method comprising the following steps:

[0056] Disassemble the discarded lithium iron phosphate battery after complete discharge, and dismantle it in a glove box to separate the positive electrode material, place the positive electrode material in absolute ethanol for ultrasonic cleaning for 15 minutes, and centrifuge to remove a small amount of current collector residual components , followed by drying at 60°C for 2h, crushing and grinding to a particle size of ≤1mm to obtain a semi-finished product of lithium iron phosphate, 1000g of semi-finished product of lithium iron phosphate and 30g of 1500 mesh aluminum powder and 20g of B-mMPCFs fiber (2.66wt% boron doped mesophase Pitch-based graphite fibers, the fiber length is 0.4-0.5 μm) mixed, and then placed in 2000g of absolute ethanol for wet ball milling for 1 hour to obtain a mixed slurry, which was pre-dried at 80°C until the ...

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Abstract

The invention relates to the field of lithium battery materials, in particular to a regeneration method of lithium iron phosphate in a retired lithium battery. The method comprises the following steps: pretreating a positive electrode material obtained by decomposing a waste lithium iron phosphate battery to obtain a lithium iron phosphate semi-finished product; mixing the lithium iron phosphate semi-finished product with aluminum powder and carbon fibers, then putting the mixture into a dispersing agent for wet ball milling, pre-drying the obtained mixed slurry to obtain pre-dried powder, andputting the pre-dried powder into an argon atmosphere for purging and drying to obtain dried powder; continuously purging and heating the dried powder in a mixed atmosphere of hydrogen and argon, andkeeping the temperature constant for a period of time to obtain a precursor; continuously carrying out constant-temperature purging on the precursor in a mixed atmosphere of carbon source gas and hydrogen, and then performing cooling in an argon atmosphere to finish regeneration. According to the method, the lithium iron phosphate positive electrode material can be effectively recycled; the regeneration process is environment-friendly, and secondary pollution is avoided; the obtained lithium iron phosphate positive electrode material has better cycle performance and gram volume.

Description

technical field [0001] The invention relates to the field of lithium battery materials, in particular to a method for regenerating lithium iron phosphate in decommissioned lithium batteries. Background technique [0002] Lithium iron phosphate cathode material is currently one of the most promising cathode materials for lithium-ion power batteries. It has the advantage of high theoretical capacity, and its usage is also relatively large. However, the current lithium iron phosphate material has a low lithium ion diffusion coefficient and poor electronic conductivity, which makes it difficult to intercalate and extract lithium ions, and the electron mobility is poor, resulting in a short service life. [0003] Therefore, a large number of lithium batteries are decommissioned every year, and there is currently no effective and efficient recycling and regeneration method for the lithium iron phosphate cathode material inside it. [0004] Such as CN103825064B, it directly recycl...

Claims

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Application Information

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IPC IPC(8): H01M10/54H01M10/0525H01M4/58
CPCH01M10/54H01M10/0525H01M4/5825Y02W30/84Y02E60/10
Inventor 高月春毛信长
Owner 余姚市鑫和电池材料有限公司
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