Method for separating lithium and graphite from negative electrode material of waste lithium battery and resource utilization

A negative electrode material, lithium battery technology, applied in battery recycling, recycling technology, recycling by waste collectors, etc., can solve environmental pollution and other problems, and achieve the effect of reducing environmental impact

Inactive Publication Date: 2016-02-24
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Throw away waste lithium batteries at will, and various toxic and harmful components in lithium batteries will enter the environment through various channels, causing serious environmental pollution

Method used

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  • Method for separating lithium and graphite from negative electrode material of waste lithium battery and resource utilization
  • Method for separating lithium and graphite from negative electrode material of waste lithium battery and resource utilization
  • Method for separating lithium and graphite from negative electrode material of waste lithium battery and resource utilization

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] 1. Select the waste lithium-ion battery, discharge it, remove the shell and get the negative electrode copper foil, after it is dried, peel off the copper foil to get the graphite powder material, and put it into a muffle furnace at 600°C Burn for 1h.

[0021] 2. Weigh 0.1g of waste electrode graphite powder and place it in a beaker, and conduct lithium leaching experiment in a low temperature and constant temperature reactor. The concentration of hydrochloric acid is controlled at 3mol / L, the solid-liquid ratio is maintained at 1:50g / mL, and the reaction time is 90min~130min , the reaction temperature is 80°C, and the volume ratio of hydrochloric acid / hydrogen peroxide is 10:1. After continuous stirring, the mixed solution is vacuum-filtered through a microporous filter membrane, and the filter membrane is washed with deionized water to separate lithium-containing solution and graphite material. Finally, the obtained graphite material is dried for future use.

[0022...

Embodiment 2

[0030] 1. Select the waste lithium-ion battery, discharge it, remove the shell and get the negative electrode copper foil, after it is dried, peel off the copper foil to get the graphite powder material, and put it into a muffle furnace at 600°C Burn for 1h.

[0031] 2. Weigh 0.1g of waste graphite electrode powder and place it in a beaker, and conduct lithium leaching experiment in a low-temperature constant temperature reactor. The concentration of citric acid is controlled at 0.15mol / L, and the solid-liquid ratio is maintained at 1:50g / mL. React for 40 minutes, and the temperature Set to 80°C, citric acid-hydrogen peroxide volume ratio 15:1. After continuous stirring, the mixed solution is vacuum-filtered through a microporous filter membrane, and the filter membrane is washed with deionized water to separate lithium-containing solution and graphite material. Finally, the obtained graphite material is dried for future use.

[0032] 3. Weigh 1g of graphite material into a ...

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Abstract

The invention relates to a method for separating lithium and graphite from a negative electrode material of a waste lithium battery and resource utilization. The method comprises the steps of pre-treatment on a negative electrode graphite material, separation and leaching of lithium ions in a waste lithium battery mixed material and preparation of graphene, wherein pre-treatment mainly comprises lithium battery disassembly, graphite material stripping, organic impurity removal and the like; the separation and leaching of the lithium ions in the waste lithium battery mixed material comprises control on indexes such as acid concentration, solid-liquid ratio, time, temperature and acid / oxidizing agent volume, and finally, the lithium ion recycle is realized by methods of low-temperature stirring and filtering; and the graphene preparation comprises graphite oxidization and reduction, oxidization mainly comprises control and regulation on the oxidizing agent and process parameters of the temperature rise process and the like, and reduction mainly comprises adjustment on parameters such as pH, the ratio of hydrazine hydrate to graphite oxide and the like. According to the method, a lithium-rich leaching liquid and the graphene are finally obtained through the application of a series of combined processes.

Description

technical field [0001] The invention belongs to the technical field of environmental protection, and relates to a method for separating lithium and graphite from a negative electrode material of a lithium battery and preparing graphene. The lithium-containing leachate and graphene are obtained by processing the negative electrode graphite material of a lithium battery. While separating from lithium, graphite can also be used as a raw material for the production of graphene for high-quality resource utilization. The invention is suitable for resource utilization of graphite-containing negative electrode graphite materials of lithium batteries. Background technique [0002] Lithium batteries are widely used due to their excellent performance, but a large number of waste lithium batteries are not properly disposed of and become a source of pollution. The long-term use of lithium batteries has caused a large number of lithium ions to be embedded and fixed in the graphite micros...

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 贺文智刘展鹏赵敏夏静李光明郭扬朱昊辰黄菊文
Owner TONGJI UNIV
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