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Regeneration method of graphite anode of lithium ion battery

A lithium-ion battery and graphite negative electrode technology, which is applied in the field of lithium-ion battery graphite negative electrode regeneration, can solve the problems of cumbersome regeneration process and many impurities in graphite, and achieve the effect of maintaining good battery performance and simple process

Active Publication Date: 2015-05-20
WANXIANG 123 CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The present invention aims to solve the problem that the regeneration process of the graphite negative electrode of the lithium ion battery is cumbersome in the prior art, and the graphite obtained after the treatment has more impurities, and provides a lithium ion battery graphite negative electrode regeneration method with a simple process and less impurities in the regenerated graphite

Method used

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  • Regeneration method of graphite anode of lithium ion battery
  • Regeneration method of graphite anode of lithium ion battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Take a used 22Ah soft-pack lithium iron phosphate battery, weighing 485g, and follow the steps below:

[0028] (1) Put the waste battery into the cutting machine to cut off the tabs, separate the aluminum-plastic film and the battery core of the battery, and put the tabs, aluminum-plastic film, and battery cells into three barrels filled with circulating lye for soaking. The lye is 0.5mol / L sodium hydroxide solution, soak for 1h. The tabs and aluminum-plastic film after alkali immersion and drying are collected and recycled.

[0029] (2) Take out the battery, cut the tape on the battery, and separate the negative electrode in the battery. Put the negative electrode sheet into the stirring device, and the stirring device adopts a closed stirring barrel. Then, a 10% aqueous solution of N-methylpyrrolidone in a capacity of 1200 ml was added and stirred.

[0030] (3) Take out the suspension separated after stirring, transfer the suspension into a centrifuge, centrifuge t...

Embodiment 2

[0033] Take a used 22Ah soft-pack lithium iron phosphate battery, weighing 480g, and follow the steps below:

[0034] (1) Put the waste battery into the cutting machine to cut off the tabs, separate the aluminum-plastic film and the battery core of the battery, and put the tabs, aluminum-plastic film, and battery cells into three barrels filled with circulating lye for soaking. The lye is 1mol / L sodium hydroxide solution, soak for 0.5h. The tabs and aluminum-plastic film after alkali immersion and drying are collected and recycled.

[0035] (2) Take out the battery, cut the tape on the battery, and separate the negative electrode in the battery. Put the negative electrode sheet into the stirring device, and the stirring device adopts a closed stirring barrel. Then, 800 ml of N-methylpyrrolidone solvent was added and stirred.

[0036] (3) Take out the suspension separated after stirring, transfer the suspension into a centrifuge, centrifuge to separate the clear liquid, put ...

Embodiment 3

[0039] Take a used 22Ah soft-pack lithium iron phosphate battery, weighing 488g, and follow the steps below:

[0040] (1) Put the waste battery into the cutting machine to cut off the tabs, separate the aluminum-plastic film and the battery core of the battery, and put the tabs, aluminum-plastic film, and battery cells into three barrels filled with circulating lye for soaking. The lye is 0.8mol / L sodium hydroxide solution, soak for 0.8h. The tabs and aluminum-plastic film after alkali immersion and drying are collected and recycled.

[0041] (2) Take out the battery, cut the tape on the battery, and separate the negative electrode in the battery. Put the negative electrode sheet into the stirring device, and the stirring device adopts a closed stirring barrel. Then, a 10% aqueous solution of N-methylpyrrolidone in a capacity of 1200 ml was added and stirred.

[0042] (3) Take out the suspension separated after stirring, transfer the suspension into a centrifuge, centrifuge...

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Abstract

The invention discloses a regeneration method of a graphite anode of a lithium ion battery. The regeneration method comprises the following steps: separating an electrical core from a waste lithium ion battery, washing with alkali, separating a suspension liquid containing graphite from a negative plate by virtue of an N-methyl pyrrolidone solvent or an aqueous solution containing N-methyl pyrrolidone, and then carrying out centrifugal separation, acid picking and drying to obtain regenerated graphite. According to the regeneration method disclosed by the invention, by virtue of gradual separation of the waste battery, the regenerated graphite and other battery parts including an aluminum-plastic membrane, a diaphragm and a current collector can be recovered; the whole operation process is simple in procedure, the regenerated graphite is not subjected to destroyed treatment, and the performance of the prepared battery keeps good for reusing.

Description

technical field [0001] The invention relates to the field of regeneration of battery materials, in particular to a method for regeneration of graphite negative electrodes of lithium ion batteries. Background technique [0002] In recent years, the number of lithium-ion batteries has increased rapidly, and the problem of recycling waste batteries has become increasingly urgent. At present, the recovery of heavy metals in lithium-ion battery cathode sheets has been industrialized, but the recovery of anode graphite is not perfect. According to the statistics of the Ministry of Information Industry, in 2011, there were about 3,600 tons of waste lithium-ion batteries in my country, and the amount of graphite that can be recycled in waste batteries is more than 6,000 tons every year. Now the amount is only a lot more. [0003] Chinese patent authorization announcement number: CN101710632A, in the patent document on May 19, 2010, the authorization announcement date discloses a me...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/54
CPCH01M10/0525H01M10/54Y02E60/10Y02W30/84
Inventor 石先兴葛民民吕豪杰高新宝陈军
Owner WANXIANG 123 CO LTD