Carbon-based ionic intercalation energy-storage electrode material and preparation process thereof

A technology of energy storage electrodes and ions, applied in the manufacture of hybrid/electric double layer capacitors, hybrid capacitor electrodes, etc., can solve the problems of limited energy density of electrochemical capacitors, increased active sites, complex process operations, etc., to achieve high durability Effects of voltage characteristics, process continuity, and guaranteed mass transfer characteristics

Inactive Publication Date: 2013-04-03
TIANJIN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The large specific surface area of ​​traditional porous carbon electrodes increases the number of carbon dangling bonds, that is, the increase of electrochemical reaction active sites on the surface of porous carbons, which leads to irreversible electrochemical reactions above 2.7V. This condition limits the organic The safe working voltage of the electrochemical capacitor must be lower than 2.7V (although the voltage range of the organic electrolyte is 4.0~4.5V), which limits the energy density of the electrochemical capacitor
Qian Weizhong et al. used liquid phase treatment to remove inorganic oxide carriers, metals, metal sulfides, metal carbides, etc. in "A Purification Method for Carbon Nano-electrode Materials for Supercapacitors" (CN201210135516.8), freeze-drying, High-temperature weak oxidizing gas treatment and other methods have obtained supercapacitor carbon nano-electrode materials with withstand voltage performance of 4~6.5V, but the above-mentioned preparation method is more complicated in process operation and higher in cost

Method used

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  • Carbon-based ionic intercalation energy-storage electrode material and preparation process thereof
  • Carbon-based ionic intercalation energy-storage electrode material and preparation process thereof
  • Carbon-based ionic intercalation energy-storage electrode material and preparation process thereof

Examples

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Effect test

Embodiment 1

[0017] Add 350g of Jining refined coal tar pitch (softening point: 33°C) to the reactor, 3 Nitrogen gas was introduced at a rate of 10 °C / min, under continuous stirring, the temperature was raised to 400 °C at a heating rate of 10 °C / min, the thermal polycondensation reaction was carried out for 3 h, the heating was stopped, and naturally cooled to room temperature to obtain 176 g of polycondensed asphalt with a softening point of 158 °C. Then take 10g of polycondensed asphalt and grind it to 40μm, put it into the carbonization furnace with 0.5m 3 Nitrogen gas was introduced at a rate of 10 °C / min, and the temperature was raised to 800 °C at a rate of 10 °C / min, carbonized for 2 h, and naturally cooled to room temperature. Mix the prepared 7.5g carbonized sample and 15g KOH into the carbonization furnace, heat up to 800°C at a heating rate of 10°C / min in a nitrogen atmosphere, activate for 2h, cool naturally to room temperature, boil and wash with 500ml 1M HCl solution for 5h,...

Embodiment 2

[0020] This example differs from Example 1 in that: the carbonization temperature is changed from 800°C to 900°C, and the carbonization time is changed from 2h to 1h. The prepared carbonized sample was changed from 7.5g to 7.2g, the amount of KOH used in the activation process was changed from 15g to 14.4g, and the mass of carbon-based ion intercalation energy storage carbon electrode material finally obtained was changed from 6.4g to 6.1g.

[0021] The above-mentioned carbon-based ion intercalation carbon electrode material for energy storage was obtained using a Tecnai G2 F20 transmission electron microscope, a D / MAX2500V / PC X-ray diffractometer and a TriStar3000 N 2 The results show that the material contains 10% graphite-like crystallites with relatively complete growth, and the crystallite size is in the range of 2-10nm, the interlayer distance is 0.378nm, and its BET specific surface area is 826m 2 / g, the pore volume is 0.24cm 3 / g. Mix 0.5g of sample, 0.059g of condu...

Embodiment 3

[0023] The difference between this example and Example 1 is that the mass of KOH is changed from 15g to 3.75g. Finally, the mass of the carbon-based ion intercalation energy storage carbon electrode material was changed from 6.4 g to 6.9 g.

[0024] The above-mentioned carbon-based ion intercalation carbon electrode material for energy storage was obtained using a Tecnai G2 F20 transmission electron microscope, a D / MAX2500V / PC X-ray diffractometer and a TriStar3000 N 2 The adsorption instrument was tested and analyzed, and the results showed that the material contained 7% graphite-like crystallites with relatively complete growth, and the crystallite size was in the range of 2-10nm, the interlayer distance was 0.372nm, and its BET specific surface area was 278m 2 / g, the pore volume is 0.13cm 3 / g. Mix 0.5g of sample, 0.059g of conductive carbon black (Carbon VXC 72) and 0.029g of binder (polyvinylidene fluoride PVDF), prepare a slurry, and coat a film to prepare a carbon el...

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Abstract

The invention discloses a carbon-based ionic intercalation energy-storage electrode material and a preparation process thereof and belongs to the technical field of carbon-based electrode materials. The material is composed of ordered graphite-like micro-crystals and unordered turbostratic carbon structures, wherein typical unordered turbostratic carbon structures are arranged around ordered graphite-like micro-crystal structures. The preparation process comprises the steps of conducting a thermal polycondensation reaction at the temperature of 320-400 DEG C with coal-tar pitch or ethylene tar pitch serving as a raw material, carbonizing the pitch powder which is subjected to thermal polycondensation at the temperature of 600-900 DEG C, conducting potassium hydroxide (KOH) activation at the temperature of 600-900 DEG C, and finally obtaining the material. The material has the advantages of being simple to operate, continuous in process, good in controllability and capable of achieving large-scale production easily. The prepared carbon-based ionic intercalation energy-storage electrode material has a unique structure of ordered and unordered inlaying and is high in capacitance and high in voltage resistance.

Description

technical field [0001] The invention relates to a carbon-based ion intercalation energy storage electrode material and a preparation method thereof, belonging to the technical field of carbon-based electrode materials. Background technique [0002] Carbon materials are widely used in the field of electrochemical energy storage due to their stable physical and chemical properties, low price, wide range of sources, and environmental friendliness, especially in the application of electric double layer capacitors and lithium ion battery electrode materials. At present, the carbon materials used in the field of energy storage mainly include: activated carbon, activated carbon fiber, carbon nanotubes, metal carbide-based carbon materials, hard carbon, graphite, etc. Among them, the electrode materials for the electric double layer, such as activated carbon and activated carbon fiber, mainly rely on the solid / liquid interface electric double layer generated between the electrode / e...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01G11/36H01G11/86
Inventor 陈明鸣杜思红王成扬
Owner TIANJIN UNIV
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