Recycling method for graphite anode material from waste lithium-ion battery

A lithium-ion battery and graphite negative electrode technology, which is applied in the field of recycling and reuse of graphite negative electrode materials of waste lithium-ion batteries, can solve the problems of high sample recovery cost and general performance repair effect of graphite materials, and achieve easy large-scale industrial production, excellent Electrochemical activity and cycle reversibility, effect of improving capacity performance and cycle performance

Inactive Publication Date: 2016-05-04
河南环宇赛尔新能源科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method is relatively simple, but due to the use of organic solvents, the cost of sample recovery will be high, and the performance repair effect of graphite materials is general

Method used

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  • Recycling method for graphite anode material from waste lithium-ion battery

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Soak the graphite negative electrode sheet separated from the waste lithium-ion battery for 20 minutes in a sodium hydroxide solution with a molar concentration of 0.2 mol / L for 20 minutes, soak it in a sulfuric acid solution with a molar concentration of 0.2 mol / L for 60 minutes, and then soak it in deionized water. Rinse for 20 minutes, then calcined at 450°C for 2 hours in an air atmosphere to separate the negative electrode active material from the copper foil, dry, grind, and sieve to obtain pretreated graphite powder; add ferrous oxalate to the pretreated In the final graphite powder, the ball milling method is used to mix uniformly by wet ball milling, wherein the mass ratio of graphite powder and ferrous oxalate is 1:0.1; the resulting mixture is subjected to high temperature treatment at 600°C for 2 hours under the protection of nitrogen, and then pulverized after cooling , and sieved to obtain the regenerated graphite negative electrode material.

Embodiment 2

[0019] Soak the graphite negative electrode sheet separated from the waste lithium-ion battery for 20 minutes in a sodium hydroxide solution with a molar concentration of 0.2 mol / L for 20 minutes, soak it in a sulfuric acid solution with a molar concentration of 0.1 mol / L for 60 minutes, and then soak it in deionized water. Rinse for 20 minutes, then calcined at 450°C for 2 hours in an air atmosphere to separate the negative electrode active material from the copper foil, dry, grind, and sieve to obtain pretreated graphite powder; add ferrous oxalate to the pretreated In the final graphite powder, the ball milling method is adopted to mix uniformly by wet ball milling, wherein the mass ratio of graphite powder and ferrous oxalate is 1:0.2; the resulting mixture is subjected to high temperature treatment at 600°C for 2 hours under the protection of nitrogen, and then pulverized after cooling , and sieved to obtain the regenerated graphite negative electrode material.

Embodiment 3

[0021] Soak the graphite negative electrode sheet separated from the waste lithium-ion battery in the sodium hydroxide solution with a molar concentration of 0.2mol / L for 20 minutes, soak it in a nitric acid solution with a molar concentration of 0.3mol / L for 60 minutes, and then soak it in deionized water. Rinse for 20 minutes, then calcined at 300°C for 4 hours in an air atmosphere to separate the negative electrode active material from the copper foil, dry, grind, and sieve to obtain pretreated graphite powder; add zinc oxalate to the pretreated In the graphite powder, the ball milling method was used to mix uniformly by wet ball milling, wherein the mass ratio of graphite powder and zinc oxalate was 1:0.1; the resulting mixture was subjected to high temperature treatment at 450°C for 4 hours under the protection of nitrogen, and then pulverized after cooling, and sieved The regenerated graphite negative electrode material is obtained.

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Abstract

The invention discloses a recycling method for a graphite anode material from a waste lithium-ion battery, and belongs to the technical field of recovering of materials from the waste lithium-ion battery. According to the main points of the technical scheme, the method comprises the following steps: carrying out soaking pretreatment on the graphite material recovered from the waste lithium-ion battery; carrying out ball-mill mixing on pre-calcined and separated graphite powder and a ferrous oxalate or zinc oxalate or ferrous oxalate and zinc oxalate mixture evenly; and finally preparing the battery-grade graphite anode material through high-temperature treatment. The graphite anode material prepared by the method has excellent electrochemical activity and cyclic reversibility; the discharge capacity at 0.2C reaches over 400mAh/g; and the capacity retention rate after 50 cycles is greater than 98.0%. The recycling method can efficiently recover the graphite anode material from the waste lithium-ion battery, further improves the electrical property and achieves recycling of the graphite anode material.

Description

technical field [0001] The invention belongs to the technical field of recycling waste lithium-ion battery materials, and in particular relates to a method for recycling graphite negative electrode materials of waste lithium-ion batteries. Background technique [0002] In recent years, thanks to the continuous policy support of the Chinese government, the gradual strengthening of the public's awareness of environmental protection, and the continuous efforts of a number of domestic universities, research institutes and enterprises in the research and development of power batteries, battery management systems, etc., my country's The electric vehicle market has developed rapidly. With the rapid industrialization of new energy vehicles, their sales will increase by leaps and bounds, and the amount of lithium-ion power batteries will also increase exponentially. At the same time, the problem of environmental pollution of waste lithium-ion power batteries and the problem of ration...

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 上官恩波韩光鑫段玉宾
Owner 河南环宇赛尔新能源科技有限公司
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