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Recycling method for anode graphite material for invalid prismatic lithium-ion battery

A technology for lithium-ion batteries and graphite materials, which is applied in the field of recovery and reuse of negative electrode graphite materials of invalid square lithium-ion batteries, can solve the problems of high reaction energy consumption, low recovery efficiency, poor graphite performance, etc., and achieve low reaction energy consumption, Recycling efficient effect

Active Publication Date: 2015-12-23
安徽巡鹰新能源集团有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In order to realize the resource recycling of the failed square lithium-ion battery negative electrode graphite material, researchers have carried out a lot of exploration and research, but they mainly realize the recycling of graphite through high-temperature roasting method, but the reaction energy consumption of this method is high, and the recycling Low efficiency and poor graphite performance

Method used

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  • Recycling method for anode graphite material for invalid prismatic lithium-ion battery
  • Recycling method for anode graphite material for invalid prismatic lithium-ion battery
  • Recycling method for anode graphite material for invalid prismatic lithium-ion battery

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Effect test

Embodiment 1

[0022] The failed prismatic lithium-ion battery is completely discharged and dissected. The resulting negative pole piece is ultrasonically dissolved in a 0.01mol / L dilute hydrochloric acid solution. The ultrasonic power is 60W. After the graphite sheet is completely separated from the current collector, the ultrasonic is stopped. , Take out the current collector, wash it with water, and dry it to complete the recovery of the current collector. At this time, the remaining graphite slurry is filtered, dried under vacuum at 50℃, and then sieved to separate the thickener to obtain the first purified graphite material The obtained first-purified graphite material is placed in an oxidizer solution in a water bath at 35°C for ultrasonic treatment with an ultrasonic power of 40W, and then centrifuged, washed, and dried in vacuum at 50°C, and then obtained after sieving to separate the binder Secondary purified graphite material; the obtained secondary purified graphite material is imme...

Embodiment 2

[0024] The failed prismatic lithium-ion battery is completely discharged and dissected. The resulting negative pole piece is ultrasonically dissolved in a 0.01mol / L dilute hydrochloric acid solution. The ultrasonic power is 40W. After the graphite sheet is completely separated from the current collector, the ultrasonic is stopped. , Take out the current collector, wash it with water, and dry it to complete the recovery of the current collector. At this time, the remaining graphite slurry is filtered, vacuum-dried at 60℃, and then sieved to separate the thickener to obtain the first purified graphite material The obtained first-purified graphite material is placed in an oxidant solution in a water bath at 45°C for ultrasonic treatment with an ultrasonic power of 50W, then centrifuged, washed and dried in vacuum at 60°C, and then obtained after sieving to separate the binder Secondary purified graphite material; the obtained secondary purified graphite material is immersed in a re...

Embodiment 3

[0026] The failed prismatic lithium-ion battery is completely discharged and dissected. The resulting negative pole piece is ultrasonically dissolved in a 0.01mol / L dilute hydrochloric acid solution. The ultrasonic power is 100W. After the graphite sheet is completely separated from the current collector, the ultrasonic is stopped. , Take out the current collector, wash it with water and dry it to complete the recovery of the current collector. At this time, the remaining graphite slurry is filtered, dried in vacuum at 80℃, and then sieved to separate the thickener to obtain the first purified graphite material The obtained first-purified graphite material is placed in an oxidant solution in a water bath at 25°C for ultrasonic treatment with an ultrasonic power of 30W, then centrifuged, washed, and dried in a vacuum at 80°C, and then obtained after sieving to separate the binder Secondary purified graphite material; the obtained secondary purified graphite material is immersed i...

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Abstract

The invention discloses a recycling method for an anode graphite material for an invalid prismatic lithium-ion battery. The method comprises the following steps: completely discharging the invalid prismatic lithium-ion battery, dismantling a negative pole piece and putting the negative pole piece into a dilute hydrochloric acid solution for ultrasonic dissolution; stopping ultrasound after completely separating graphite flakes from a current collector, taking out the separated current collector, and finishing recovery of the current collector after washing and drying; carrying out filtration, low-temperature vacuum drying and sieving on residual graphite slurry to obtain primarily purified graphite material, carrying out ultrasonic treatment on an oxidizing agent solution in a water bath, and carrying out centrifuging, washing, low-temperature vacuum drying and sieving to obtain secondarily purified graphite material; and carrying out ultrasonic reaction in low-temperature nitrogen atmosphere when steeping the graphite material into a reducing solution in the water bath, repairing the graphite material in the nitrogen atmosphere through thermal treatment, and cooling and sieving the graphite material, so as to obtain battery-grade modified graphite powder. The energy consumption of the reaction in the method is relatively low; and recovery is efficient.

Description

Technical field [0001] The invention relates to a method for recycling and reusing a graphite material for the negative electrode of a failed rectangular lithium ion battery. Background technique [0002] At present, the lithium-ion battery industry has entered a stage of rapid development, and countless batteries are scrapped every year. The manufacturing process of anode graphite material has the characteristics of high reaction energy consumption, demanding reaction equipment, long production cycle, etc., and the limited graphite resources will cause the situation of graphite materials in short supply. Therefore, recycling and reusing graphite materials can not only avoid the waste of graphite resources, but also alleviate the shortage of graphite materials on the market to a certain extent. [0003] In order to realize the recycling of the use of the graphite material for the negative electrode of the failed square lithium-ion battery, researchers have carried out a lot of exp...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/54
CPCY02W30/84H01M10/54
Inventor 朱晓辉苗萌张宝
Owner 安徽巡鹰新能源集团有限公司
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