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Method for regenerating waste and old graphite anode materials

A graphite negative electrode and waste technology, which is applied in the field of recycling and regeneration of waste graphite negative electrode materials, can solve the problems of high energy consumption and harsh equipment requirements, and achieve the effects of high purity, low cost, and inhibition of solvation side reactions

Active Publication Date: 2012-07-04
GUANGDONG BRUNP RECYCLING TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, modified natural graphite is limited in graphite resources, and the fixed carbon content in graphite deposit ore is 2.3%-34.5%. Regardless of modified natural graphite or artificial natural graphite, the preparation process must go through graphitization at a temperature above 1500-2800 °C The process and equipment are demanding and consume a lot of energy

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] 10Kg of waste lithium-ion battery negative electrode pieces are put into a pulverizer to pulverize, and pass through a 100-mesh stainless steel vibrating sieve. The under-sieve is graphite powder containing a small amount of metal impurities, and a total of 6.2Kg graphite powder is obtained. Take out 242g of graphite powder, add it to a 3L large beaker, add 1L of water, add 160ml of 9mol / L sulfuric acid and 40ml of 20% hydrogen peroxide at a stirring speed of 150 rpm, keep the water bath at 60°C, react for 2h, and then wash to the center properties, filtered and dried at 100°C for 5 hours to obtain purified graphite. 1.14 g MgSO 4 and 1.01 g Na 2 CO 3 Dissolve in 10 times the weight of water respectively, and add 40 grams of graphite into the MgSO4 aqueous solution, slowly add Na 2 CO 3 Solution until the reaction is over; after filtering, wash the reacted graphite with an appropriate amount of pure water at 60°C, put it in a 120°C oven for 1 hour, then put it into ...

Embodiment 2

[0021] Take 5Kg of the negative electrode powder obtained in Example 1, put it into a 30L reaction kettle, add 18L of water, add 3.6Kg of 35% hydrochloric acid and 300g of sodium chlorate, keep the water bath at 70°C, react for 3h, then wash until nearly neutral, and filter Dry at 80°C for 8 hours to obtain purified graphite. 30 g MgSO 4 and 30 g Na 2 CO 3 In order to dissolve in 10 times the weight of water respectively, and add 4.8Kg of the obtained purified graphite into the MgSO4 aqueous solution, slowly add Na 2 CO 3 Solution until the reaction is over; after filtering, wash the reacted graphite with an appropriate amount of 80°C pure water, put it in an 80°C oven for 1.5 hours, then put it into a tube furnace, and raise the temperature at 10°C / min under a nitrogen atmosphere The temperature was raised to 400°C at a speed of 8 hours, and after cooling, it was crushed and graded to obtain a regenerated graphite negative electrode material with a D50 of 16.2um.

[0022...

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PUM

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Abstract

The invention discloses a method for regenerating waste and old graphite anode materials. The method comprises the following step of: carrying out crushing, screening, impurity removal, coating, heat treatment and the like on the waste and old graphite cathode materials to obtain graphite anode material products. When the graphite cathode material is applied to an anode material of a lithium-ion battery, a first power generating capacity of the graphite anode material is higher than 320mAh / g, and 100-times circulation retention rate is 98.75 percent, and thus market requirements are met. The method for regenerating the waste and old graphite cathode materials, disclosed by the invention, has the characteristics of simple flow and high additional value and has remarkable economic benefits and social benefits.

Description

technical field [0001] The invention relates to the field of resource regeneration, in particular to a method for recycling and regenerating waste graphite negative electrode materials. Background technique [0002] According to statistics from the Ministry of Information Industry, the global output of lithium-ion batteries was 3 billion in 2008, and China is currently the world's largest producer of lithium-ion batteries, accounting for about 45% of the global total output, with 1.5 billion. The average lifespan of lithium-ion batteries is 2-3 years. By the end of 2011, all lithium-ion batteries produced in 2008 will fail. Each battery is about 30 grams. In 2011, there were 40,000 tons of waste lithium-ion batteries. The rate is 1%-3%, and the scrap and waste rate in pole piece production is 5%-7%. According to the average scrap rate of 8%, I passed about 3,600 tons of waste lithium-ion batteries in 2011, graphite accounted for about 16% of the weight of lithium-ion batter...

Claims

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Application Information

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IPC IPC(8): H01M10/54
CPCY02E60/12Y02W30/84
Inventor 林兴章李长东周汉章唐红辉刘更好
Owner GUANGDONG BRUNP RECYCLING TECH
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