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Method for recycling retired lithium battery negative electrode material

A negative electrode material and lithium battery technology, applied in the direction of battery electrodes, negative electrodes, battery recycling, etc., can solve the problems of poor economic benefits, inability to recycle graphite substrates, poor enthusiasm for recycling anode materials of decommissioned lithium batteries, etc., and achieve a large economy benefit effect

Active Publication Date: 2020-07-10
余姚市鑫和电池材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] In order to solve the poor recycling effect of the existing decommissioned lithium power battery negative electrode materials, most of them can only realize the effective recycling of copper foil, and cannot effectively recycle the graphite matrix. Recycling, and the economic benefits generated by recycling are poor, leading to problems such as poor enthusiasm for recycling the negative electrode materials of retired lithium batteries at the enterprise end. The invention provides a method for reusing the negative electrode materials of retired lithium batteries

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0054] A method for reusing a decommissioned lithium battery negative electrode material, said method comprising the following steps:

[0055] 1) Immerse the graphite / copper system negative electrode material disassembled from the decommissioned lithium power battery in N-methylpyrrolidone solvent, and let it stand in a sealed environment for 50 hours until the copper foil is detached from the graphite matrix to obtain a pre-sheet;

[0056] 2) The pre-sheet is used as the negative electrode sheet, graphite is used as the positive electrode sheet, and it is directly placed in the lithium perchlorate / PC / DME electrolyte for complete discharge treatment. The concentration of lithium perchlorate in the lithium perchlorate / PC / DME electrolyte 0.35mol / L, the volume ratio of PC and DME is 1:1, discharge the pre-sheet until the voltage drops to ≤0.2V, then filter the pre-sheet and rinse with deionized water to remove residual impurities on the surface of the pre-sheet to obtain graphite ...

Embodiment 2

[0060] A method for reusing a decommissioned lithium battery negative electrode material, said method comprising the following steps:

[0061] 1) Immerse the graphite / copper system negative electrode material disassembled from the decommissioned lithium power battery in 80wt% N-methylpyrrolidone aqueous solution, and let it stand in a sealed environment for 40h until the copper foil is detached from the graphite matrix to obtain a pre-sheet ;

[0062] 2) The pre-sheet is used as the negative electrode sheet, graphite is used as the positive electrode sheet, and it is directly placed in the lithium perchlorate / PC / DME electrolyte for complete discharge treatment. The concentration of lithium perchlorate in the lithium perchlorate / PC / DME electrolyte 0.2mol / L, the volume ratio of PC and DME is 1:0.9, discharge until the voltage drops to ≤0.2V, then filter the pre-sheet and rinse with deionized water to remove residual impurities on the surface of the pre-sheet to obtain graphite s...

Embodiment 3

[0066] A method for reusing a decommissioned lithium battery negative electrode material, said method comprising the following steps:

[0067] 1) Immerse the graphite / copper system negative electrode material disassembled from the decommissioned lithium power battery in N-methylpyrrolidone solvent, and let it stand in a sealed environment for 50 hours until the copper foil is detached from the graphite matrix to obtain a pre-sheet;

[0068] 2) The pre-sheet is used as the negative electrode sheet, graphite is used as the positive electrode sheet, and it is directly placed in the lithium perchlorate / PC / DME electrolyte for complete discharge treatment. The concentration of lithium perchlorate in the lithium perchlorate / PC / DME electrolyte 0.5mol / L, the volume ratio of PC and DME is 1:1.1, discharge until the voltage drops to ≤0.2V, then filter the pre-sheet and rinse with deionized water to remove residual impurities on the surface of the pre-sheet to obtain graphite flakes ;

...

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Abstract

The invention relates to the field of lithium battery recovery, in particular to a method for recycling a retired lithium battery negative electrode material. The method comprises the following steps:dipping a negative electrode material obtained by disassembling a retired lithium battery into an N-methyl pyrrolidone solution, and standing until a copper foil is separated from a graphite matrix,so as to obtain a pre-sheet; placing the pre-sheet as a negative plate in a lithium electrolyte for discharge treatment, and removing residual impurities on the surface of the pre-sheet to obtain graphite flakes; and crushing and ball-milling the graphite flakes into graphite powder, and recycling graphene oxide through an oxidation stripping method. According to the invention, the retired lithiumpower battery negative electrode material can be reasonably and effectively utilized; single-layer graphene powder with relatively high quality can be prepared by adopting a proper process; and greateconomic benefits can be generated.

Description

technical field [0001] The invention relates to the field of lithium battery recycling, in particular to a method for reusing negative electrode materials of decommissioned lithium batteries. Background technique [0002] The power lithium battery is a new type of high-energy battery successfully developed in the 20th century. It entered practical use in the 1970s. Because of its advantages such as high energy, high battery voltage, wide operating temperature range, and long storage life, it has been widely used in military and civilian small appliances. Among them, such as mobile phones, portable computers, video cameras, cameras, etc., they have partially replaced traditional batteries. Large-capacity lithium batteries have been tried in electric vehicles and will become one of the main power sources for electric vehicles in the 21st century, and will be used in artificial satellites, aerospace and energy storage. [0003] The interior of the power lithium battery adopts ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B32/198H01M4/587H01M10/54
CPCC01B32/198H01M10/54H01M4/587H01M2004/027Y02W30/84Y02E60/10
Inventor 高月春毛信长
Owner 余姚市鑫和电池材料有限公司
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