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Production method of high specific energy super capacitor carbonaceous electrode material

A technology for supercapacitors and electrode materials, applied in capacitors, electrolytic capacitors, circuits, etc., can solve the problems of limited preparation process and limited improvement space, and achieve the effect of simple process and high cost performance.

Inactive Publication Date: 2008-10-29
EAST CHINA UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the electric double layer capacitance is theoretically proportional to the effective specific surface area of ​​the material, the improvement of the effective specific surface area must comprehensively consider the constraints of the electrode performance such as the pore structure, surface chemical properties, resistivity and density of the material, so there is a limit to the specific capacitance C Value (~200F / g, single electrode, organic system)
Moreover, limited by the preparation process of the material, the withstand voltage U of its surface structure is only 2.7V
Recently, researchers have controlled the pore structure, surface chemical properties and conductive network of carbon porous electrode materials, and the corresponding specific capacitance can reach 180F / g, but the improvement space is very limited, resulting in the energy density E( E∝C·U 2 ) up to 10Wh / kg

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Put 500 g of petroleum coke powder with a particle size of 300 μm in a carbonization furnace, 2 Under the atmosphere, the temperature was raised to 800°C at a heating rate of 5°C / min and kept at a constant temperature for 2 hours for pre-carbonization treatment. After impregnating the above product with a KOH solution with a mass concentration of 90% or more for 24 hours, wherein the weight ratio of petroleum coke to KOH is 1:4, in N 2 Under the atmosphere, heat up to 100°C for 1 hour for physical dehydration at a heating rate of 5°C / min, then raise the temperature to 400°C for 1.5 hours for chemical dehydration at the same heating rate, then continue to heat up to 800°C for 2 hours, then cool naturally to 30°C , and then washed to neutral, and after drying, a carbonaceous material with graphite-like microcrystalline structure was obtained, and its BET specific surface area was 209m 2 / g, the pore volume is 0.19ml / g. When tetraethylamine boron tetrafluoride is used as...

Embodiment 2

[0022] On the basis of Example 1, when the KOH solution and petroleum coke powder were impregnated, 40g of Ni(NO 3 ) 2 , the specific surface area of ​​the obtained carbonaceous porous material is 279m 2 / g, the pore volume is 0.28ml / g, and the mesopore volume is 0.21ml / g. When tetraethylamine boron tetrafluoride is used as the electrolyte, the specific capacitance of the carbonaceous electrode material is 183F / g, the withstand voltage is 3.1V, and the specific energy is 10Wh / Kg.

Embodiment 3

[0024] On the basis of Example two, the resulting product is placed in a carbonization kettle, 2 Under the atmosphere, the temperature was raised to 750°C at a rate of 5°C / min for surface chemical treatment for 2 hours, and then the temperature was naturally lowered to 30°C, and the material was taken out and washed with water until neutral. The specific surface area of ​​the obtained carbonaceous porous material is 261m 2 / g, the pore volume is 0.26ml / g, and the mesopore volume is 0.20ml / g. When tetraethylamine boron tetrafluoride is used as the electrolyte, the specific capacitance of the carbonaceous electrode material is 180F / g, the withstand voltage is 3.5V, and the specific energy is 10Wh / Kg.

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Abstract

The invention discloses a preparation method for the carbon electrode material of a high-energy-density super capacitor which is characterized by pre-carbonizing a refinery coke or other form bodies rich in carbon for 0.5 to 5 hours under the temperature of 400 to 900 DEG C; then carrying out ball milling on the refinery coke or other form bodies rich in carbon to 4 to 30 Mum; then carrying out dipping and mixing with KOH at a weight percentage ratio of 1: 3 to 1: 6 (or simultaneously adding the metal salt of 5 to 20wt percent); after physical dehydration, chemical dehydration and activating hole making by being cooperated with catalyzing are carried out on the matters respectively under the temperatures of 100 to 250 DEG C, 300 to 500 DEG C and 700 to 1000 DEG C, then surface chemical treatment in an H2 atmosphere is carried out on the matters under the temperature of 500 to 900 DEG C to manufacture the carbon electrode material. The invention adopts the pre-carbonizing or the combining technology of catalyzing chemical cooperated with activation to manufacture the carbon electrode material; the invention has higher energy density and power density compared with the existing carbon electrode material as the power storage principle of the invention is different from a double electric layer power storage principle.

Description

Technical field: [0001] The invention relates to a preparation method of a novel carbon material. The invention belongs to a method for preparing carbonaceous electrode materials for high specific energy and high specific power supercapacitors. Background technique: [0002] Supercapacitors have become a research hotspot in the field of new energy due to their excellent characteristics such as fast charge and discharge speed, long cycle life, high energy density and no pollution. Its application in hybrid vehicles, solar energy, wind energy, etc. , Urban environmental control has a fundamental impact. Electrode materials are at the heart of supercapacitors. At present, the most researched electrode materials are carbon porous materials such as super activated carbon, carbon aerogel, and carbon nanotubes based on the electric double layer theory. Although the electric double layer capacitance is theoretically proportional to the effective specific surface area of ​​the mat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01G9/042
CPCY02E60/13
Inventor 凌立成张睿詹亮乔文明梁晓怿孙刚伟
Owner EAST CHINA UNIV OF SCI & TECH
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