Graphene and preparation method thereof and lithium ion battery

A lithium-ion battery and graphene technology, applied in the field of electrochemistry, can solve the problem of low energy storage capacity, and achieve the effects of simple preparation process, easy mass production, and high energy storage capacity

Inactive Publication Date: 2014-03-26
OCEANS KING LIGHTING SCI&TECH CO LTD +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, in practical applications, the energy storage capacity of graphene is not high due to agglomeration and other reasons.

Method used

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  • Graphene and preparation method thereof and lithium ion battery
  • Graphene and preparation method thereof and lithium ion battery

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Experimental program
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Effect test

preparation example Construction

[0018] Preparation of graphene: the specific preparation process flow of graphene of the present invention is as follows: graphite→graphite oxide→graphene oxide→graphene.

[0019] In the present invention, the preparation process of graphene is roughly divided into the following steps.

[0020] (1) Preparation of graphite oxide: adding graphite with a purity of 99.5% to a mixed solution composed of concentrated sulfuric acid with a mass fraction of 98% and concentrated nitric acid with a mass fraction of 65%, adding permanganic acid to the mixed solution after stirring Potassium is heated and oxidized, and then 30% mass fraction of hydrogen peroxide solution is added to stir to remove potassium permanganate, then the mixed solution is suction-filtered, and then the suction-filtered product is washed and dried with dilute hydrochloric acid and deionized water in turn. Graphite oxide was obtained, and graphite oxide was dried in a vacuum oven at 60° C., and the drying time was 1...

Embodiment 1

[0031] Embodiment 1: The preparation method in Embodiment 1 of the present invention includes the following steps.

[0032] (1) Preparation of graphite oxide: 1 g of graphite with a purity of 99.5% is added to a mixed solution consisting of 95 ml of concentrated sulfuric acid (98% by mass fraction) and 25 ml of concentrated nitric acid (65% by mass fraction), and the mixture is placed on ice Under the water mixing bath environment, stir for 20 minutes, then slowly add 6g of potassium permanganate to the mixture, stir for 1 hour, then heat the mixture to 85°C and keep it for 30 minutes, then add 92ml of deionized water and continue to stir at 85°C Keep at ℃ for 30 minutes, finally add 10ml hydrogen peroxide solution (mass fraction 30%), stir for 10 minutes, filter the mixture with suction, then wash the solids with 100ml dilute hydrochloric acid and 150ml deionized water successively, and finally The solid matter was dried in a vacuum oven at 60°C for 12 hours to obtain graphit...

Embodiment 2

[0035] Embodiment 2: The preparation method in Embodiment 2 of the present invention includes the following steps.

[0036](1) Preparation of graphite oxide: 1 g of graphite with a purity of 99.5% is added to a mixed solution consisting of 85 ml of concentrated sulfuric acid (98% by mass fraction) and 20 ml of concentrated nitric acid (65% by mass fraction), and the mixture is placed on ice Under the water mixing bath environment, stir for 20 minutes, then slowly add 4g of potassium permanganate to the mixture, stir for 1 hour, then the mixture is heated to 85°C and kept for 30 minutes, then add 92ml of deionized water and continue at 85 Keep at ℃ for 30 minutes, finally add 6ml of hydrogen peroxide solution (mass fraction 30%), stir for 10 minutes, filter the mixture with suction, then wash the solids with 100ml of dilute hydrochloric acid and 150ml of deionized water successively, and finally The solid matter was dried in a vacuum oven at 60°C for 12 hours to obtain graphite...

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Abstract

The invention relates to graphene and a preparation method thereof. The preparation method comprises the following steps: (1) preparing oxidized graphene, and (b) preparing the graphene. The invention also relates to application of the graphene in a lithium ion battery. The graphene prepared by adopting the preparation method disclosed by the invention is processed by plasma. The graphene is more in defects, so that the graphene has high energy storage capacity when being coated on a current collector to use, and the preparation technology is simple. Therefore, large-scale production is easily achieved.

Description

technical field [0001] The invention relates to the field of electrochemistry, in particular to a graphene and a preparation method thereof. The invention also relates to a lithium ion battery prepared by using the graphene as an electrode material. Background technique [0002] At present, lithium-ion batteries are widely used in daily life, but the further development of lithium-ion batteries faces two major problems: low energy storage capacity and low safety. At present, the electrode material used in commercial lithium-ion batteries is generally graphite, and its theoretical capacity is 372mAh / g, which is relatively low, so the energy storage potential platform (0-0.25V vs Li / Li+) is relatively low. This often leads to the generation of lithium dendrites, which will pierce the separator when a certain amount of lithium dendrites are produced, causing a short circuit between the positive and negative electrodes, which will generate a large amount of heat, which will cau...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B31/04H01M4/587H01M10/0525C01B32/192
CPCY02E60/10
Inventor 周明杰王要兵钟辉袁新生
Owner OCEANS KING LIGHTING SCI&TECH CO LTD
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