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Porous graphene nanosheet, preparation method and application of porous graphene nanosheet as electrode material

A technology of porous graphene and nanosheets, applied in battery electrodes, circuits, electrical components, etc., can solve the problems of reduced Coulombic efficiency of electrode materials, complex preparation process, and large pollution

Active Publication Date: 2015-06-10
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[L. Zhang et al. Nano Letter, 2012, 12, 1806-1812.] [Z. Fan et al. Carbon, 2012, 50, 1699-1712.] [Y. Zhu et al. Science, 2011, 332, 1537-1541.] This method is not only complicated in preparation process, but also high in cost and pollution, and difficult to produce in large quantities
In addition, the activation process often introduces a large number of functional groups, which easily leads to a decrease in the Coulombic efficiency of the electrode material.

Method used

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  • Porous graphene nanosheet, preparation method and application of porous graphene nanosheet as electrode material
  • Porous graphene nanosheet, preparation method and application of porous graphene nanosheet as electrode material
  • Porous graphene nanosheet, preparation method and application of porous graphene nanosheet as electrode material

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Effect test

Embodiment 1

[0033] With phenolic resin 2.5g and copper nitrate (Cu(NO 3 ) 2 ·3H 2 O) 9.87g (atomic ratio Cu:C=1:4), and curing agent hexamethylenetetramine 0.35g, respectively dissolved in absolute ethanol, after the dissolution is complete, mix evenly, and stir naturally until the ethanol is completely volatilized. The mixture was cured in a vacuum oven at 150°C for 4 hours, and then the cured product was placed in a carbonization furnace and heated to 600°C for 6 hours under nitrogen protection. The carbonization product is a carbon sheet embedded with copper nanoparticles, which is immersed in 30% H 2 o 2 After the solution was oxidized for 2 hours, an excess of concentrated hydrochloric acid (36.8%~38%) was added, soaked in acid for about 12 hours, then filtered under reduced pressure, washed with deionized water until neutral, and dried to obtain a microporous, mesopore-rich Hierarchical pore structure carbon nanosheets. Put the hierarchical porous carbon sheet in a high-tempera...

Embodiment 2

[0038] Operating condition is the same as embodiment 1, and difference is that copper nitrate (Cu(NO 3 ) 2 ·3H 2 O) The mass was changed to 4.94g (atomic ratio Cu:C=1:8), and the carbonization condition was 800°C for 6 hours.

[0039] The resulting porous graphene nanosheets have a width of 5-15 μm, a thickness of about 2-15 nm, and a specific surface area of ​​96.3 m 2 / g. The electrochemical test was carried out by the same method as in Example 1, and the results showed that the reversible capacity reached 401.0 mAh / g at a current density of 50 mA / g, and the capacity remained at 350.3 mAh / g after 50 cycles. Under high current, the reversible capacity is 227.4 mAh / g when the current density is 1 A / g, and 147.8 mAh / g when the current density is 3 A / g.

Embodiment 3

[0041] Operating condition is the same as embodiment 1, and difference is that copper nitrate (Cu(NO 3 ) 2 ·3H 2 O) The mass was changed to 19.74g (atomic ratio Cu:C=1:2), and the solvent used was replaced by pyridine.

[0042] The resulting porous graphene nanosheets have a width of 1-8 μm, a thickness of about 1-10 nm, and a specific surface area of ​​298.4 m 2 / g. The electrochemical test was carried out by the same method as in Example 1, and the results showed that the reversible capacity reached 459.0 mAh / g at a current density of 50 mA / g, and the capacity remained at 397.8 mAh / g after 50 cycles. Under high current, the reversible capacity is 275.5 mAh / g when the current density is 1 A / g, 151.7 mAh / g when the current density is 3 A / g, and 118.9 mAh / g at 10 A / g.

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Abstract

The invention relates to a porous graphene nanosheet preparation method, which takes resin as a carbon source, resin and a metal source are solidified and charred to obtain carbon plate with a hierarchical pore structure, and the carbon plate is graphitized to obtain the porous graphene nanosheet. The preparation method of the porous graphene nanosheet has the advantages of simple process, low cost, little pollution and easy realization of large scale production; and the porous graphene nanosheet presents high capacity and excellent multiplying power performance when being as a cathode material of a lithium ion battery.

Description

technical field [0001] The invention relates to a porous graphene nanosheet, a preparation method and an application in lithium ion batteries, belonging to the fields of electrochemistry and new energy materials. Background technique [0002] Graphene is a single layer of carbon atoms through sp 2 Carbonaceous materials with a two-dimensional honeycomb lattice structure formed by hybridization close packing are the basic structural units of fullerenes, carbon nanotubes and graphite. Graphene's unique two-dimensional sheet structure makes it have high strength, excellent electrical conductivity, thermal conductivity, chemical stability and good ductility, etc., so it can be used in energy storage devices such as lithium-ion batteries and supercapacitors, sensors, photoelectric conversion etc. have extensive and meaningful research and application value. [0003] Porous graphene refers to a class of materials containing nanopores on the surface of graphene. Due to its large...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/583C01B31/04
CPCY02E60/10
Inventor 宋怀河宋冉冉陈晓红
Owner BEIJING UNIV OF CHEM TECH
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