Recycling method of negative electrode material of waste lithium ion battery

A technology for lithium ion batteries and negative electrode materials, which is applied in the field of recycling and utilization of negative electrode materials of waste lithium ion batteries, can solve the problems of aggravating dust pollution, greenhouse effect, waste of resources, etc., and achieves excellent electrochemical performance, saving resources, and simple steps. Effect

Active Publication Date: 2019-05-10
NORTHEAST NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The anode materials in the current commercialized lithium-ion batteries are mainly artificial graphite and natural modified graphite, which can only be discarded or incinerated at high temperature, which aggravates the dust pollution and greenhouse effect, and also causes a lot of waste of resources. Therefore, the simple recycling and utilization of negative electrode materials is particularly important.

Method used

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  • Recycling method of negative electrode material of waste lithium ion battery

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Effect test

Embodiment 1

[0031] Disassemble the waste lithium cobalt oxide battery manually after discharging, use a utility knife to scrape off the positive electrode material on the positive electrode sheet, wash the scraped negative electrode material of the waste lithium ion battery with absolute ethanol for 3 times, centrifuge and dry to obtain Solid, the obtained solid material was put into a tube furnace under an argon atmosphere and calcined at 700° C. for 14 hours to obtain the final product recycled graphite.

[0032] The electrochemical performance of recycled graphite was tested using a half-cell:

[0033] Sodium ion battery: including positive pole piece, negative pole piece, diaphragm and electrolyte, wherein the active material of positive pole piece is recycled graphite, conductive agent is acetylene black, binder is polyvinylidene fluoride, recycled graphite, conductive agent and adhesive The mass ratio of the binder is 7:2:1, the sodium sheet is the counter electrode, the glass fiber...

Embodiment 2

[0039] Other conditions are the same as in Example 1, only the calcination temperature is changed to 800°C.

[0040] According to the method for embodiment 1, reclaim graphite is carried out electrochemical test, test result shows:

[0041] In sodium-ion batteries: the charge-discharge range is 0.01-2.8V, and the charge-discharge current density is 100mA / g, the material capacity can reach 148mAh / g, and the capacity has no obvious attenuation after 1000 cycles. Potassium ion battery: the charge and discharge range is 0.01-2V, and the charge and discharge at a current density of 50mA / g, the material capacity can reach 290mAh / g, and the capacity has no obvious attenuation after 100 cycles.

[0042] The above results prove that the method provided by the present invention can successfully recycle the graphite in the waste lithium cobalt oxide battery, and the final obtained material has higher capacity and stable cycle performance. The test results are listed in Table 1.

Embodiment 3

[0044] Other conditions are the same as in Example 1, only the calcination temperature is changed to 900°C.

[0045] According to the method for embodiment 1, reclaim graphite is carried out electrochemical test, test result shows:

[0046] In sodium-ion batteries: the charge-discharge range is 0.01-2.8V, and the charge-discharge current density is 100mA / g, the material capacity can reach 150mAh / g, and the capacity has no obvious attenuation after 1000 cycles. Potassium ion battery: the charge and discharge range is 0.01-2V, and the charge and discharge at a current density of 50mA / g, the material capacity can reach 290mAh / g, and the capacity has no obvious attenuation after 100 cycles.

[0047] The above results prove that the method provided by the present invention can successfully recycle the graphite in the waste lithium cobalt oxide battery, and the final obtained material has higher capacity and stable cycle performance. The test results are listed in Table 1.

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Abstract

The invention provides a recycling method of negative electrode material of a waste lithium ion battery, and belongs to the technical field of new battery systems. The recycling method comprises the following steps: disassembling and recycling the negative electrode material of the waste lithium ion battery; after that, washing, drying and calcining the negative electrode material to obtain recycled graphite; and taking the recycled graphite as the negative electrode material, and applying the recycled graphite to a sodium ion battery and a potassium ion battery, so as to realize secondary utilization of the recycled graphite. The recycling method provided by the invention has simple steps, saves resources, and the recycled graphite shows superior electrochemical performance. The result ofthe embodiment of the invention shows that the recycled graphite is applied to the sodium ion battery and the potassium ion battery, after that, the sodium ion battery and the potassium ion battery are high in charging specific capacity and good in cycle performance.

Description

technical field [0001] The invention relates to the technical field of new battery systems, in particular to a method for recycling waste lithium-ion battery negative electrode materials. Background technique [0002] Due to the advantages of high working voltage, large specific capacity, long cycle life, low self-discharge, and no memory effect, lithium-ion batteries have been widely used in portable electronic devices such as notebook computers and mobile phones. However, due to the limited service life of lithium-ion batteries, the generation of waste lithium-ion batteries is also increasing year by year. Batteries are an important environmental pollutant, so the disposal and reuse of waste batteries is urgent. [0003] For the recovery of positive electrode materials, researchers have carried out related work, but the recovery technology for negative electrode materials is not yet perfect. The anode materials in the current commercialized lithium-ion batteries are mainl...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/54H01M4/587H01M10/0525H01M10/054C01B32/215
CPCY02E60/10Y02W30/84
Inventor 吴兴隆梁皓杰
Owner NORTHEAST NORMAL UNIVERSITY
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