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Method for preparing porous graphene by recycling graphite cathode materials from waste power batteries

A technology of porous graphene and graphite negative electrode, applied in battery recycling, graphene, recycling of waste collectors, etc., can solve the problems of difficult high product added value, low value, etc. A wide range of effects

Pending Publication Date: 2019-12-20
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In order to solve the problem that the recycled graphite anode materials of lithium-ion power batteries are of low value and difficult to convert into high value-added products, the present invention proposes a simple, efficient and low-cost method for preparing porous graphene by utilizing graphite anode materials of waste power batteries material method

Method used

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  • Method for preparing porous graphene by recycling graphite cathode materials from waste power batteries
  • Method for preparing porous graphene by recycling graphite cathode materials from waste power batteries
  • Method for preparing porous graphene by recycling graphite cathode materials from waste power batteries

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Embodiment 1

[0054] A method for preparing porous graphene by reclaiming graphite negative electrode materials from waste power batteries, comprising the following steps:

[0055] (1) Discharge, disassemble, and cut the waste power battery (waste cylindrical lithium iron phosphate power battery), and separate the positive and negative materials to obtain the graphite negative electrode sheet. The effect picture observed under the scanning electron microscope is as follows figure 1 shown, from figure 1 It can be observed that the graphite negative electrode sheet is a block of different sizes, the specific surface area is relatively small, and there is a passivation layer (SEI film) covering the surface of the graphite negative electrode sheet. The solid electrolyte interface formed by the reaction of the electrolyte on the solid-liquid phase interface; the graphite negative electrode sheet is added to distilled water, the mass ratio of the graphite negative electrode sheet to distilled wat...

Embodiment 2

[0063] A method for preparing porous graphene by reclaiming graphite negative electrode materials from waste power batteries, comprising the following steps:

[0064] (1) Discharge, disassemble, and cut the waste power battery (waste cylindrical lithium iron phosphate power battery), and separate the positive and negative materials to obtain a graphite negative electrode sheet; add the graphite negative electrode sheet to distilled water, and the graphite The mass ratio of the negative electrode sheet to distilled water is 1:50, mix evenly, and then carry out ultrasonic stripping treatment, the time of the ultrasonic stripping treatment is 30min, the frequency of the ultrasonic stripping treatment is 40KHz, obtain the dispersion, filter to take the precipitate, at 80 ℃ Drying under conditions to obtain graphite negative electrode material, the drying time is 5h;

[0065] (2) Place 5g of the graphite negative electrode material described in step (1) in the heating zone of the t...

Embodiment 3

[0072] A method for preparing porous graphene by reclaiming graphite negative electrode materials from waste power batteries, comprising the following steps:

[0073] (1) Discharge, disassemble, and cut the waste power battery (waste cylindrical lithium iron phosphate power battery), and separate the positive and negative materials to obtain a graphite negative electrode sheet; add the graphite negative electrode sheet to distilled water, and the graphite The mass ratio of the negative electrode sheet to distilled water is 1:10, mix evenly, and then carry out ultrasonic stripping treatment, the time of the ultrasonic stripping treatment is 10min, the frequency of the ultrasonic stripping treatment is 40KHz, obtain the dispersion liquid, filter to take the precipitate, and heat it at 60°C Drying under conditions to obtain graphite negative electrode material, the drying time is 3h;

[0074] (2) Place 3g of the graphite negative electrode material described in step (1) in the he...

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Abstract

The invention discloses a method for preparing porous graphene by recycling graphite cathode materials from waste power batteries. The method comprises the following steps: disassembling a waste battery to obtain a graphite cathode piece; adding water to the graphite cathode piece for ultrasonic treatment to obtain dispersion liquid, filtering and drying the dispersion liquid to obtain a graphitecathode material; heating the graphite cathode material in inert gas and water vapor to obtain a porous graphite material; uniformly mixing a sulfuric acid solution and a phosphoric acid solution, adding the porous graphite material and potassium permanganate, and then heating to obtain a heated suspension; adding a hydrogen peroxide solution into the heated suspension, carrying out centrifuging,adding a precipitate into a hydrochloric acid solution, adding water to obtain a mixed solution, and dialyzing to obtain a porous graphene oxide solution; and drying the porous graphene oxide solution, introducing inert gas, and heating to obtain the porous graphene. According to the method, the cost is low, the yield is high, and the prepared porous graphene material has high added value and wideapplication prospects, and is capable of producing certain economic and social benefits.

Description

technical field [0001] The invention belongs to the field of electrode material recycling, and in particular relates to a method for preparing porous graphene by recycling graphite negative electrode materials from waste power batteries. Background technique [0002] With the increasingly prominent energy and environmental issues, the development of energy has become a major trend of energy strategy. Energy storage and conversion devices play a very important role in the development of new energy strategies. In particular, lithium-ion batteries are widely used in mobile communications, electronic products, power vehicles and other fields, and their usage has exploded. However, with the replacement of consumer electronic products and the scrapping of electric vehicles entering the cycle in the next few years, a large number of waste lithium-ion batteries will be generated. Nowadays, a large number of electronic products are discarded after being scrapped, which not only pose...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B32/184H01M10/54
CPCC01B32/184H01M10/54C01B2204/32C01B2204/20Y02W30/84
Inventor 徐建铁肖峰陈香宏张加奎赵思湸雷雨鄢铭
Owner SOUTH CHINA UNIV OF TECH