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Original composition of carbon material for electrode of electric double-layer capacitor

A technology of electric dipole and composition, which is applied in the direction of hybrid capacitor electrodes, hybrid/electric double layer capacitor manufacturing, electrolytic capacitors, etc., can solve the problem of insufficient performance of specific area, insufficient electrostatic capacitance, and insufficient performance, etc. problem, to achieve the effect of large electrostatic capacitance and small internal resistance

Active Publication Date: 2007-08-01
NIPPON OIL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0010] However, the capacitance per unit volume of the electrode material using the carbon material obtained by the method shown in Patent Document 1 is not necessarily sufficient.
In the research of the present inventors, as described in Patent Document 1, the carbonization treatment of petroleum coke or coal tar pitch coke makes it a carbon material with a specific volatile component and H / C atomic ratio. On the contrary, the performance of the specific area caused by the activation treatment is not the same. full
In Patent Document 2, even though the physical properties of the raw carbon composition are involved, the relationship between the electrostatic capacitance of the manufactured capacitor is not an index showing sufficient performance

Method used

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Examples

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Effect test

Embodiment 1

[0085] (i) Manufacture of raw carbon composition

[0086] 10 vol% of residual oil from a vacuum distillation unit (0.17% by mass of sulfur component, 0.9% by mass of asphaltenes) was mixed with 90% by volume of bottom oil from a flow contact cracking apparatus of petroleum heavy oil. By carbonizing (coking) this heavy oil mixture at 500° C. for 1.0 hour, a raw carbon composition having a volatile content of 5.8% by mass and a microstrength of 7% was obtained. In addition, the structure of the raw carbon composition obtained in this way was observed by a polarizing microscope, and it was found that it was an optically anisotropic structure, and the flow pattern was the main factor. In addition, the average interlayer distance d of microcrystalline carbon 002 It is 0.346nm, and the porosity is 22%.

[0087] (ii) Manufacture of carbon materials

[0088] 200 parts by mass of potassium hydroxide was mixed with respect to 100 parts by mass of the raw material carbon composition, ...

Embodiment 2

[0098] The raw carbon composition of Example 1 was treated under an inert gas atmosphere at 650° C. for 1 hour to obtain a raw carbon composition with a volatile content of 3.3% by mass and a microstrength of 13%. In addition, the average interlayer distance of the microcrystalline carbon was 0.344 nm, and the porosity was 24%. Then, alkali activation treatment was performed in the same manner as in Example 1 to obtain a carbon material for electrodes. The carbon material has a specific area of ​​900m 2 / g, the micropore volume is 0.47cm 3 / g, the micropore diameter is 2.0nm. Using this carbon material, an electrode was produced in the same manner as in Example 1, a battery was mounted, and the capacitance was measured. As a result, the capacitance per unit volume (F / cc) was 34 F / cc.

Embodiment 3

[0100] The raw coke composition of Example 1 was treated under an inert gas atmosphere at 750° C. for 1 hour to obtain a raw coke composition with a volatile component of 1.7% by mass and a microstrength of 18%. In addition, the average interlayer distance of the microcrystalline carbon was 0.343 nm, and the porosity was 25%. Then, alkali activation treatment was performed in the same manner as in Example 1 to obtain a carbon material for electrodes. The carbon material has a specific area of ​​600m 2 / g, the micropore volume is 0.30cm 3 / g, the micropore diameter is 2.1nm. Using this carbon material, an electrode was produced in the same manner as in Example 1, a battery was mounted, and the capacitance was measured. As a result, the capacitance per unit volume (F / cc) was 35 F / cc.

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Abstract

Disclosed is a raw material carbon composition which can be a carbon material for electrodes of electric double layer capacitors when activated. Such a raw material carbon composition is characterized by having a volatile content of not less than 1.3% by mass and not more than 15% by mass. The raw material carbon composition is further characterized by having a microstrength of 5-30% when the volatile content is less than 6% by mass while having a microstrength of a 5-20% when the volatile content is 6% by mass or more. The capacitance per unit volume of an electric double layer capacitor can be increased by using such a raw material carbon composition.

Description

technical field [0001] The present invention relates to a raw carbon composition suitable as an electrode material for an electric double layer capacitor, a carbon material for an electrode using the raw carbon composition, and an electric double layer capacitor including an electrode containing the carbon material for an electrode . Background technique [0002] Conventionally, it has been considered that the capacitance of an electric double layer capacitor is approximately proportional to the surface area of ​​polarizable electrodes (such as carbon electrodes) provided as an anode and a cathode constituting the electric double layer capacitor. Therefore, in the case of using a carbon electrode as a polarizable electrode, various studies have been made to increase the surface area of ​​the carbon material used for the carbon electrode to increase the electrostatic capacity. [0003] For example, activated carbon has been mainly used conventionally as a carbon material for...

Claims

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Application Information

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IPC IPC(8): H01G9/058C01B31/02C01B31/12H01G9/14H01G11/22H01G11/24H01G11/26H01G11/34H01G11/38H01G11/42H01G11/44H01G11/86
CPCY02T10/7022Y02E60/13
Inventor 田野保大山隆尾野秀树猪饲庆三竹下究
Owner NIPPON OIL CO LTD
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