Method for preparing porous carbon material used for storing energy

A carbon material and pore volume technology, applied in the field of preparation of new porous carbon electrode materials, can solve the problems of long intercalation/deintercalation distance of lithium ions, limited power density improvement space, low power density of lithium ion batteries, etc., to improve energy Density and high power performance, excellent specific energy-specific power performance, effects of improving energy density and high power performance

Inactive Publication Date: 2009-09-16
HUNAN INSTITUTE OF SCIENCE AND TECHNOLOGY +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] For commercial lithium-ion batteries using graphitic nonporous carbon as the negative electrode, on the one hand, graphitized nonporous carbon combines with lithium ions to form Li x C 6 (0+ ) within the range of reversible capacity of not more than 200mAh / g; on the other hand, the granular graphitized non-porous carbon leads to too long intercalation / deintercalation distance of lithium ions, which limits the improvement space of its power density, so graphitized non-porous carbon lithium Specific energy-specific power performance of ion batteries is inherently limited
With the continuous introduction of products (such as electric vehicles, etc.) that require high energy density and excellent specific energy-specific power performance energy storage devices, the current low power density of lithium-ion batteries has been difficult to meet the requirements of these products

Method used

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  • Method for preparing porous carbon material used for storing energy
  • Method for preparing porous carbon material used for storing energy
  • Method for preparing porous carbon material used for storing energy

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Take the average pore diameter as 6nm and the specific surface area as 1100m 2 / g of SBA-15 silica template 1g, mesophase pitch 0.4g, fully ground in a mortar, mixed evenly, put into a quartz boat, and then transferred to a tube furnace, 99.99% nitrogen protection, at 5°C / min Raise the temperature of the electric furnace to 280°C and keep it warm for 10 hours, then raise the temperature of the electric furnace to 900°C at a heating rate of 10°C / min, keep it warm for 2 hours, and cool to room temperature under the protection of nitrogen. Use 30% hydrofluoric acid to remove the silica template, filter, wash the filter residue with water until neutral, and dry at 100°C to obtain the product. The specific surface area of ​​the obtained carbon material is 400m 2 / g, the average pore diameter is 4.0nm (as attached to the instructions figure 1 shown), the hole wall has a typical sheet-like stacking structure (as shown in the attached figure 2 shown). As an electrode mater...

Embodiment 2

[0029] Take the average pore diameter as 6nm and the specific surface area as 1100m 2 / g of SBA-15 silica template 1g, mesophase pitch 0.2g, fully ground in a mortar, mixed evenly, put into a quartz boat, and then transferred to a tube furnace, 99.99% nitrogen protection, at 5°C / min Raise the temperature of the electric furnace to 300°C and keep it warm for 8 hours, then raise the temperature of the electric furnace to 900°C at a heating rate of 10°C / min, keep it warm for 1 hour, and cool to room temperature under the protection of nitrogen. Use 30% hydrofluoric acid to remove the silica template, filter, wash the filter residue with water until neutral, and dry at 100°C to obtain the product. The specific surface area of ​​the obtained carbon material is 600m 2 / g, the average pore diameter is 5.0nm, and the pore wall has a typical sheet-like packing structure. As a supercapacitor electrode material, in a 6mol / L KOH solution, the mass specific capacitance of the carbon mate...

Embodiment 3

[0031] Take the average pore diameter as 8nm and the specific surface area as 830m 2 / g of SBA-15 silica template 1g, mesophase pitch 0.4g, fully ground in a mortar, mixed evenly, put into a quartz boat, and then transferred to a tube furnace, 99.99% nitrogen protection, at 5°C / min Raise the temperature of the electric furnace to 320°C and keep it warm for 6 hours, then raise the temperature of the electric furnace to 900°C at a heating rate of 10°C / min, keep it warm for 2 hours, and cool to room temperature under the protection of nitrogen. Use 30% hydrofluoric acid to remove the silica template, filter, wash the filter residue with water until neutral, and dry at 100°C to obtain the product. The specific surface area of ​​the obtained carbon material is 210m 2 / g, the average pore diameter is 6.0nm, and the pore wall has a typical sheet-like packing structure. As a supercapacitor electrode material, in 6mol / L KOH solution, the mass specific capacitance of carbon material r...

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Abstract

The invention provides a method for preparing a special carbon material with sheet stacked phase structure, integrated carbon atoms at the edge of pore wall surface and controllable pore structure. Special middle phase bitumen is used as a carbon precursor. The carbon precursor is mixed with an inorganic template uniformly in a certain way, the heat preservation is carried out under certain temperature for 0.5 to 10 hours, an electric cooker is heated to 900 DEG C at the speed of 5-20 DEG C/min, and the temperature is kept for 1 to 2 hours. The template is removed, and the carbon material with special phase, surface and pore structure is prepared. The carbon material is subjected to heat treatment within the range of 1500 to 2600 DEG C, and the graphitization degree of the carbon material is adjusted. The method for preparing the carbon material has the advantages of easily obtained raw material and simple technology. Being used as electrode material of a super capacitor, the quality specific capacitance of the carbon material in 6mol/LKOH solution is 220F/g, the unit area specific capacitance is 45muF/cm <2>, and the carbon material has good high-power working performance. Being used as a lithium ion cell cathode, the reversible capacity of the carbon material is 485mAh/g, and the carbon material has the good high-power working performance.

Description

[0001] Field: [0002] The invention belongs to the technical field of preparation of porous carbon materials, and in particular relates to a preparation method of a novel porous carbon electrode material that can be used for negative electrodes of supercapacitors and lithium ion batteries. Background technique: [0003] Supercapacitor is a new type of energy storage device with energy storage performance between traditional capacitors and secondary batteries. It has higher power density than secondary batteries and higher energy density than traditional capacitors. Under working conditions, it has incomparable advantages over secondary batteries and traditional capacitors, and is highly valued by industrially developed countries. In addition, due to its high energy density, lithium-ion batteries have been widely used in various commercial secondary energy storage devices. [0004] Due to the advantages of cheap and easy to obtain, good thermal and electrical conductivity, go...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B31/02H01G9/058H01G9/042H01G11/24H01G11/86
CPCY02E60/13
Inventor 侯朝辉何斌鸿易健民周宁波阎建辉唐课文杨加伟
Owner HUNAN INSTITUTE OF SCIENCE AND TECHNOLOGY
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