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Preparation method of polypyrrole-coated three-dimensional graphene Co3O4 lithium battery negative electrode material

A technology of lithium tricobalt tetroxide and negative electrode materials, applied in the fields of materials science and electrochemistry, can solve the problems of MOF chemical stability and structural stability, electrical conductivity and cycle life need to be improved, irreversible capacity loss, etc., to achieve good cycle stability , Excellent electrochemical performance, excellent electrochemical performance

Active Publication Date: 2019-11-05
SHANGHAI INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Graphene has a thin-layer two-dimensional structure, good thermal stability, and resistivity (10 -6 Ω / cm) is small, electrons can move rapidly, the lithium storage performance is much higher than that of pure graphite, and it has high specific surface area and superior electrochemical performance; metal-organic framework, as a new generation of porous materials, has both high specific surface area and porous channels. It can be used to prepare electrochemically active materials, but MOF still has some major technical problems as a lithium battery material: the chemical stability and structural stability of MOF are insufficient, and there is irreversible capacity loss. Its conductivity and cycle life need to be improved, etc.

Method used

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  • Preparation method of polypyrrole-coated three-dimensional graphene Co3O4 lithium battery negative electrode material
  • Preparation method of polypyrrole-coated three-dimensional graphene Co3O4 lithium battery negative electrode material
  • Preparation method of polypyrrole-coated three-dimensional graphene Co3O4 lithium battery negative electrode material

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Experimental program
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Effect test

Embodiment 1

[0044] A method for preparing polypyrrole-coated three-dimensional graphene tricobalt tetroxide composite material, specifically comprising the following steps:

[0045] (1) 0.0415g potassium hexacyanocobaltate (K 3 [Co(CN) 6 ]) was added to 16.65mL graphene oxide solution (3mg / mL), dissolved in 100mL deionized water;

[0046] (2) Stir magnetically for 10 minutes, and mix the above solution evenly;

[0047] (3) Ultrasound for 5 minutes to form a uniformly mixed dispersion;

[0048] (4) 0.3424g cobalt chloride hexahydrate (CoCl 2 ·6H 2 O) add in the above-mentioned solution, and stir 60min;

[0049] (5) Add 150mg ammonium persulfate ((NH 4 ) 2 S 2 o 8 ) and 150 μL pyrrole, centrifuged after continuous stirring for 24 hours;

[0050] (6) The centrifuged product was freeze-dried overnight (24h);

[0051] (7) Put the obtained product into a tube furnace, raise the temperature to 350° C. at a heating rate of 10° C. / min, calcinate in an air atmosphere for 2 hours, and coo...

Embodiment 2

[0054] A method for preparing polypyrrole-coated three-dimensional graphene tricobalt tetroxide composite material, specifically comprising the following steps:

[0055] (1) Potassium hexacyanocobaltate (K 3 [Co(CN) 6 ]) added to the graphene oxide solution, graphene oxide (GO) and potassium hexacyanocobaltate (K 3 [Co(CN) 6 ]) in a mass ratio of 1:1, soluble in deionized water;

[0056] (2) Stir magnetically for 10 minutes, and mix the above solution evenly;

[0057] (3) Ultrasound for 5 minutes to form a uniformly mixed dispersion;

[0058] (4) Cobalt chloride hexahydrate (CoCl 2 ·6H 2 O) add in the above solution, the addition is potassium hexacyanocobaltate (K 3 [Co(CN) 6 ]) 7.1 times of the mass, continue to stir for 60min;

[0059] (5) Ammonium persulfate ((NH 4 ) 2 S 2 o 8 ) and pyrrole, ammonium persulfate ((NH 4 ) 2 S 2 o 8 ) is added in an amount 3 times that of graphene oxide (GO) quality, and the added amount of pyrrole is ammonium persulfate ((NH ...

Embodiment 3

[0063] (1) Potassium hexacyanocobaltate (K 3 [Co(CN) 6 ]) added to the graphene oxide solution, graphene oxide (GO) and potassium hexacyanocobaltate (K 3 [Co(CN) 6 ]) with a mass ratio of 1.5:1, soluble in deionized water;

[0064] (2) Stir magnetically for 20 minutes, and mix the above solution evenly;

[0065] (3) Ultrasound for 10 minutes to form a uniformly mixed dispersion;

[0066] (4) Cobalt chloride hexahydrate (CoCl 2 ·6H 2 O) add in the above solution, the addition is potassium hexacyanocobaltate (K 3 [Co(CN) 6 ]) 7.2 times of the mass, continue to stir for 60min;

[0067] (5) Ammonium persulfate ((NH 4 ) 2 S 2 o 8 ) and pyrrole, ammonium persulfate ((NH 4 ) 2 S 2 o 8 ) is added in an amount 3 times that of graphene oxide (GO) quality, and the added amount of pyrrole is ammonium persulfate ((NH 4 ) 2 S 2 o 8 ) 3 times the mass, centrifuged after continuous stirring for 24 hours at room temperature;

[0068] (6) The centrifuged product was freeze-...

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Abstract

The invention relates to a preparation method of a polypyrrole-coated three-dimensional graphene Co3O4 lithium battery negative electrode material. The preparation method comprises the steps of preparing graphene oxide by a Hummers method, and purifying; dissolving the graphene oxide and (K3[Co(CN)6]) in deionized water for uniform mixing; adding (CoCL<2>.6H2O), and performing uniform mixing; adding ((NH4)2S2O8) and pyrrole, and performing stirring and mixing; and placing the obtained product in a tubular furnace, performing heating and calcination in air, and cooling to a room temperature toobtain the polypyrrole-coated three-dimensional graphene Co3O4. Compared with the prior art, the preparation method has the advantages that favorable experiment data and theoretical support are provided for the application of a graphene-based high-molecular polymer-coated metal organic framework composite material in an aspect of a lithium ion battery electrode material.

Description

technical field [0001] The invention belongs to the field of material science and electrochemical technology, and in particular relates to a method for preparing a polypyrrole-coated three-dimensional graphene tricobalt tetraoxide lithium battery negative electrode material. Background technique [0002] With the continuous expansion of industrial production scale and the needs of economic development, the ever-increasing energy demand and the gradual depletion of non-renewable energy sources such as fossil fuel reserves have caused fierce competition for resources. At the same time, the increase in greenhouse gas emissions has led to global climate change, the environment Pollution has led to an increase in the number of patients with related diseases, and the energy and environmental problems faced by human society are becoming more and more serious. Therefore, human society has an increasingly urgent demand for new energy materials and high-efficiency energy storage contai...

Claims

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Application Information

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IPC IPC(8): H01M4/525H01M4/62
CPCH01M4/625H01M4/525H01M4/624Y02E60/10
Inventor 黄燕山高丽韩生王洁常宾马健李原婷
Owner SHANGHAI INST OF TECH
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