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Synthetic recovering method for positive pole waste tablet from ferric phosphate lithium cell

A technology of lithium iron phosphate battery and recycling method, which is applied in battery recycling, waste collector recycling, electrode manufacturing and other directions, can solve the problems of inappropriate recycling of positive electrode material waste pieces, increasing cost pressure on battery manufacturers, and environmental pollution, etc. Achieve the effect of realizing economic benefits, environmental and social benefits, avoiding solid waste pollution, and simple process

Active Publication Date: 2009-03-11
ZHENGZHOU BAK BATTERY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These waste sheets not only cause waste of resources and increase the cost pressure of battery manufacturers, but also cause environmental pollution if they are not handled properly, but the current known methods are not suitable for the recycling of such waste sheets of positive electrode materials

Method used

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  • Synthetic recovering method for positive pole waste tablet from ferric phosphate lithium cell
  • Synthetic recovering method for positive pole waste tablet from ferric phosphate lithium cell
  • Synthetic recovering method for positive pole waste tablet from ferric phosphate lithium cell

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] The positive electrode waste collected in the production of lithium iron phosphate batteries is crushed with a crusher, and the particle size of the crushed electrode pieces is controlled at 0.5-3cm. The broken positive electrode fragments were placed in a muffle furnace under nitrogen protection, and heat-treated at a temperature of 600° C. for 8 hrs to decompose the binder in the electrode piece. Use a vibrating sieve to sieve the heat-treated positive electrode waste. The undersieve is the mixture of lithium iron phosphate cathode material, conductive agent, and binder residue. The oversieve is aluminum foil, positive electrode material lumps and still The positive electrode material attached to the surface of the aluminum foil. The XRD pattern (X-ray diffraction pattern) and SEM pattern (scanning electron microscope pattern) of undersize image 3 and Figure 4 Shown, with the XRD pattern of lithium iron phosphate raw material ( figure 1 ) and SEM images ( figur...

Embodiment 2

[0034] The positive electrode waste collected in the production of lithium iron phosphate batteries is crushed with a crusher, and the particle size of the crushed electrode pieces is controlled at 4-8cm. The crushed positive electrode fragments were placed in a muffle furnace under nitrogen protection and heat-treated at a temperature of 400° C. for 6 hrs to invalidate the binder in the pole pieces. Vibrating sieves are used to sieve the heat-treated positive electrode waste. The undersieve is a mixture of lithium iron phosphate cathode material, conductive agent, and binder residue. The oversieve is aluminum foil, positive electrode material lumps and attached to Positive material on the surface of aluminum foil.

[0035] Soak the sieve obtained above in NMP at 45°C and keep stirring for 1 hour, the lithium iron phosphate positive electrode material, conductive agent and binder residues can be peeled off from the aluminum foil, and the separated aluminum foil is sent to the ...

Embodiment 3

[0037] The positive electrode waste collected in the production of lithium iron phosphate batteries is crushed with a crusher, and the particle size of the crushed electrode pieces is controlled at 4-8cm. The crushed cathode fragments were placed in a muffle furnace under nitrogen protection, and heat-treated at a temperature of 500° C. for 5 hrs to invalidate the binder in the pole pieces.

[0038]Soak the waste electrode piece after heat treatment in NMP at 60°C and keep stirring for 0.5h, the lithium iron phosphate cathode material, conductive agent and binder residue can be peeled off from the aluminum foil, and the separated aluminum foil is sent to the smelting plant for metal recovery aluminum. Continue stirring for 2 hrs to fully loosen and disperse the lumpy positive electrode mixture. Lithium iron phosphate positive electrode material, conductive agent and binder residues are filtered and baked at 120 for 20hrs. Use a mill to grind the dried mixture for 2hrs and th...

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Abstract

The invention relates to a synthesized recovery method for waste positive plates of iron phosphate lithium batteries. The method comprises the following steps: collected waste positive plate material is mechanically crashed into fragments; the fragments are positioned in a welding furnace which is protected by vacuum atmosphere, inert gases and / or reducing gases and / or nitrogen and are heat processed in the temperature of 150-750 DEG C; aluminum foil basal bodies are separated from the fragments after heat process by adopting mechanical separation or ultrasonic concussion to obtain a mixture of iron phosphate lithium positive material, conduction agent and caking agent giblets; the mixture of iron phosphate lithium anode material, conduction agent and caking agent giblets is roasted for 8-24 hrs in 80-150 DRG C; the mixture after roasting is classified to control the grain diameter of the powder material to be not more than 20 microns, and the D50 is controlled to be 3-10 microns so as to obtain iron phosphate lithium positive recovery material. The method has simple technique, takes effect fast and reduces the material consumption and production cost of a manufacturer.

Description

【Technical field】 [0001] The invention relates to a battery material recovery method, in particular to a comprehensive recovery method for lithium iron phosphate battery positive electrode waste. 【Background technique】 [0002] With the rapid development of electronic technology, lithium batteries that provide power for various portable electronic products are increasingly widely used. At present, lithium batteries have replaced nickel-cadmium batteries and nickel-metal hydride batteries in the field of small secondary batteries and become the mainstream of commercial secondary batteries. . With the continuous growth of lithium battery consumption, more and more scraps and scraps are generated in the manufacturing process of lithium batteries. Many lithium battery manufacturers and waste treatment units have only stopped dealing with such industrial waste at present. In the case of simple acid-base treatment to recover part of the lithium salt, this treatment method not onl...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/54H01M4/04B09B3/00
CPCY02E60/10Y02W30/84
Inventor 唐红辉周冬王弗刚王驰伟万华平
Owner ZHENGZHOU BAK BATTERY CO LTD
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