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Graphitized carbon material and preparation method thereof, and supercapacitor

A technology of graphitized carbon and degree of graphitization, applied in the direction of hybrid capacitor electrodes, etc., can solve the problems of low energy density of commercial supercapacitors, can not significantly improve the conductivity of activated carbon, etc., and achieve the effect of high energy density

Active Publication Date: 2015-09-30
NINGBO GRAPHENE INNOVATION CENT CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, since the addition of conductive agents only reduces the contact resistance between activated carbon particles and increases the diffusion rate of ions / electrons outside the activated carbon particles, the addition of conductive agents cannot significantly improve the conductivity of activated carbon. The energy density of commercial supercapacitors is still low

Method used

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  • Graphitized carbon material and preparation method thereof, and supercapacitor
  • Graphitized carbon material and preparation method thereof, and supercapacitor
  • Graphitized carbon material and preparation method thereof, and supercapacitor

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preparation example Construction

[0044] The present invention provides a kind of preparation method of graphitized carbon material described in above-mentioned technical scheme, comprises the following steps:

[0045] a), the carbon source is mixed with the metal catalyst to obtain a carbon source adsorbed with the metal catalyst;

[0046] The metal catalyst includes one or more of nickel salt, iron salt, molybdenum salt, cobalt salt and tungsten salt;

[0047] The mass ratio of the carbon source to the metal catalyst is 1: (0.001-2);

[0048] b), the carbon source adsorbed with the metal catalyst is mixed with an activator to obtain a precursor;

[0049] The activator includes one or more of water vapor, potassium hydroxide, phosphoric acid, zinc chloride, sodium hydroxide;

[0050] The mass ratio of the activator to the carbon source in step a) is (0.5-10):1;

[0051] c) The precursor is heated and carbonized in an inert gas atmosphere to obtain a graphitized carbon material.

[0052] In the preparation...

Embodiment 1

[0090] Get 100g phenolic resin (4169, Taiwan Changchun), it is immersed in the aqueous solution that contains 50g nickel sulfate in 200ml, dry, obtain the phenolic resin that adsorbs metal ion catalyst; solution, dried and pulverized to obtain a precursor.

[0091] Put the precursor in a tube furnace, in a nitrogen atmosphere, feed methane gas at a flow rate of 5000mL / h, and at the same time raise the temperature to 900°C at a heating rate of 4°C / min, keep it for 1h, take it out after natural cooling, and then Pickling, filtering and drying are carried out to obtain a graphitized carbon material.

[0092] Add 0.3 g of the above-prepared graphitized carbon material into a 25 mL measuring cylinder, shake it up and down, and finally obtain a tap density of 0.4 g / mL by visual inspection.

[0093] The specific surface area, porosity and average pore diameter of the above-mentioned graphitized carbon material are detected, and the result is: the specific surface area is 1500m 2 / g...

Embodiment 2

[0102] Get 100g phenolic resin (4169, Taiwan Changchun), it is immersed in the aqueous solution that contains 50g nickel sulfate in 200ml, dry, obtain the phenolic resin that adsorbs metal ion catalyst; solution, dried and pulverized to obtain a precursor.

[0103] Take 1000g of melamine and the precursor and mix it evenly, then place it in a tube furnace, in a nitrogen atmosphere, raise the temperature to 850°C at a rate of 4°C / min, keep it for 6h, take it out after natural cooling, and then carry out pickling, filtration, Dry to obtain a graphitized carbon material.

[0104] Scanning electron microscope (SEM) test is carried out to above-mentioned graphitized carbon material that makes, the result is as follows figure 2 shown. figure 2 For the SEM figure of the graphitized carbon material that the embodiment of the present invention 2 obtains, by figure 2 It can be seen that one-dimensional carbon nanotubes with a diameter of 20-100 nm are grown in situ on the surface ...

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Abstract

The invention belongs to the field of carbon materials, and particularly relates to a graphitized carbon material and a preparation method thereof, and a supercapacitor. The graphitized carbon material provided by the invention can implement bulk phase graphitization, the degree of graphitization is 20-90%, the average pore size is 2-5nm, the porosity is 1.0-1.6 cm<3> / g, and the tap density is 0.2-0.5 g / ml. The supercapacitor prepared from the graphitized carbon material has higher energy density, and thus, has high practical application value. The experimental result indicates that the energy density of the supercapacitor prepared from the graphitized carbon material is greater than 10Wh / kg, the power density is greater than 20 kW / kg, and the capacity attenuation after 10000 loops under 10C magnification is less than 5%.

Description

technical field [0001] The invention belongs to the field of carbon materials, and in particular relates to a graphitized carbon material, a preparation method thereof and a supercapacitor. Background technique [0002] At present, the increasingly prominent energy and environmental issues have made the efficient storage and conversion of electric energy and clean energy a focus of attention. Activated carbon has the advantages of low price, wide range of sources, high volume specific capacity, and simple preparation. At present, it is widely used in commercial supercapacitors. The principle is mainly to store electric energy through the adsorption / desorption of electrostatic ions on the interface between the high specific surface area of ​​activated carbon and the electrolyte. It has high power density, fast charge and discharge, and millions of times. Long cycle life and safety and reliability characteristics. [0003] The specific surface area of ​​commercial activated ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B31/04H01G11/34
CPCY02E60/13
Inventor 郑超姜萍吕彬彬王国华周旭峰刘兆平
Owner NINGBO GRAPHENE INNOVATION CENT CO LTD
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