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Method for recovering and restoring anode material graphite of waste lithium ion battery

A technology for lithium ion batteries and anode materials, which is applied in the field of recycling and repairing anode material graphite of waste lithium ion batteries, can solve problems such as the blank of anode graphite recycling, and achieve the effects of high added value of products, reduced energy consumption and short process flow.

Active Publication Date: 2010-05-19
HUNAN BRUNP RECYCLING TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The recovery of heavy metals cobalt and nickel in lithium-ion battery cathode sheets has been industrialized, but the recovery of lithium-ion battery anode graphite is still blank

Method used

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  • Method for recovering and restoring anode material graphite of waste lithium ion battery
  • Method for recovering and restoring anode material graphite of waste lithium ion battery
  • Method for recovering and restoring anode material graphite of waste lithium ion battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Soak 10 pieces of 18650-type lithium-ion battery negative electrodes in warm water at 80°C and stir at a stirring speed of 200r / min, washing time of 4h, filter, dry, and pass through a 100-mesh standard sieve to obtain 140g of graphite powder. Get 140 grams of graphite powder and soak in the mixed solution of 200ml, 0.4mol / L sodium chlorate and 2mol / L hydrochloric acid, and constantly stir, stirring speed is 250r / min, and the reaction times is 2.5h, removes the metal impurity in graphite, then Filter and dry at 90°C to constant weight. Take 120 grams of dry graphite from which metal impurities have been removed, place it in a ceramic crucible, put it into a muffle furnace, and in an air atmosphere, raise the temperature to 500°C at a rate of 10°C / min and keep it warm for 2 hours to obtain 113.1g of pure graphite, namely graphite Sample, high temperature weight loss rate is 5.75%.

[0037]100 g of the obtained graphite sample was immersed in 200 ml of a surface modifica...

example 2

[0040] Soak 10 pieces of 18650-type lithium-ion battery negative electrodes in warm water at 70°C and stir at a stirring speed of 200r / min for 4 hours, filter, dry, and pass through a 100-mesh standard sieve to obtain 140 grams of graphite powder. Get 140 grams of graphite powder and soak in the mixed solution of 200ml, 0.4mol / L hydrogen peroxide and 1mol / L sulfuric acid, and keep stirring, the stirring speed is 250r / min, the reaction time is 2.5h, remove the metal impurities in the graphite, then filter, Dry at 90°C to constant weight. Take 120 grams of dry graphite from which metal impurities have been removed, place it in a ceramic crucible, put it into a muffle furnace, and in an air atmosphere, raise the temperature to 550°C at a rate of 10°C / min and keep it warm for 2 hours to obtain 111.0g of pure graphite, namely graphite The high temperature weight loss rate of the sample is 7.50%.

[0041] 100 g of the obtained graphite sample was immersed in 200 ml of a surface mod...

example 3

[0043] Soak 10 pieces of 18650-type lithium-ion battery negative electrodes in warm water at 75°C and stir at a stirring speed of 200r / min, washing time of 4h, filter, dry, and pass through a 100-mesh standard sieve to obtain 140g of graphite powder. Get 140 grams of graphite powder and soak in the mixed solution of 200ml, 0.4mol / L hydrogen peroxide and 2mol / L hydrochloric acid, and keep stirring, the stirring speed is 250r / min, the reaction time is 2.5h, remove the metal impurities in the graphite, then filter, Dry at 90°C to constant weight. Take 120 grams of dry graphite from which metal impurities have been removed, place it in a ceramic crucible, put it into a muffle furnace, and in an air atmosphere, raise the temperature to 580°C at a rate of 10°C / min, and keep it warm for 2 hours to obtain 107.2g of pure graphite, namely graphite The high temperature weight loss rate of the sample is 10.66%.

[0044] 100 g of the obtained graphite sample was immersed in 200 ml of a su...

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Abstract

The invention discloses a method for recovering and restoring anode material graphite of a waste lithium ion battery, which belongs to the technical fields of resource cyclic utilization and inorganic material restoration. The method comprises the following steps: (1) separating graphite from copper foil to obtain crude anode material graphite; (2) removing lithium, copper and other metallic impurities in the crude anode material graphite; (3) removing acetylene black and residual organic substances, oxidizing the surface of the graphite; and (4) coating and surface-finishing. The tap density of the graphite obtained in the invention reaches 1.07 g / cm<3>; the first discharge capacity is 335.7 mAb / g; the first charge-discharge efficiency is 90.5%; after circulations for 54 times, the capacity conservation rate is 97.23%; and the properties of the graphite obtained in the invention correspond to the properties of graphite of lithium ion batteries in the market. The invention has the advantages of high graphite recovery rate, high raw material purity, simple technology, low energy consumption and the like, has economic benefit, and also has social benefit of saving finite graphite resources, reducing environmental pollution and the like.

Description

technical field [0001] The invention belongs to resource recycling and repair technology of inorganic materials, and relates to a recovery and repair method of graphite, an anode material of a waste lithium ion battery. Background technique [0002] At present, there are mainly two types of graphite used as anode materials for lithium-ion batteries, modified natural graphite and artificial graphite. The preparation process of modified natural graphite is generally coarse crushing-fine crushing-acid-base washing-flotation-drying-spheroidization treatment-grading-purification-drying-mixing / doping-carbonization-graphitization-sieving, man-made The process of graphite is raw material asphalt, etc. - thermal condensation - extraction - carbonization - graphitization - screening. Whether it is modified natural graphite or artificial graphite, the preparation process must go through the graphitization process at a temperature above 2800 ° C, so the equipment is demanding and the e...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/54
CPCY02E60/12Y02W30/84
Inventor 李长东黄国勇谭群英
Owner HUNAN BRUNP RECYCLING TECH
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