Semiconductor device manufacturing: process – Making field effect device having pair of active regions... – Having insulated gate
Reexamination Certificate
2002-05-23
2003-12-09
Nelms, David (Department: 2818)
Semiconductor device manufacturing: process
Making field effect device having pair of active regions...
Having insulated gate
Reexamination Certificate
active
06660583
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a process for producing activated carbon for an electrode of an electric double-layer capacitor, and to carbon material for used in such process.
2. Description of the Related Art
To produce such a type of activated carbon, a process is conventionally used, in which a carbon material such as petroleum and coal carbon materials is subjected sequentially to a carbonizing treatment and an alkali activating treatment (for example, see Japanese Patent Application Laid-open No. 2000-77273).
However, since activated carbon for an electrode produced using a carbon material as described above has an electrostatic capacity revealing voltage of as high as 4 V, there is a possibility of the following problems: the expansion amount of two electrodes is increased due to the application of a high voltage, so that a large load is applied to a case of a capacitor, leading to a possibility that the deformation and/or fracture of the case and the short-circuit between the two electrodes, and to a possibility that an electrolyte is decomposed to increase the internal resistance and thus increase the resistance of the capacitor.
SUMMARY OF THE INVENTTON
Accordingly, it is an object of the present invention to provide a process capable of producing activated carbon for an electrode of a low electrostatic capacity revealing voltage and a high electrostatic capacity density (F/cc) by using a particular carbon material.
To achieve the above object, according to the present invention, there is provided a process for producing activated carbon for an electrode of a electric double-layer capacitor, comprising the steps of: subjecting a carbon material to a carbonizing treatment; and then subjecting the carbon material to an alkali activating treatment; wherein the carbon material used is a condensed polycyclic aromatic compound which has a condensed ring and at least one aliphatic hydrocarbon radical bonded to said condensed ring, said condensed ring including at least one alicyclic hydrocarbon structure moiety; and wherein, in an analysis chart resulting from a
13
C-NMR spectroscopy of the condensed polycyclic aromatic compound, a signal intensity ratio I
L
/I
R
is equal to or larger than 0.2, and a signal intensity ratio I
C
/I
R
is equal to or larger than 0.14, wherein I
R
represents a signal intensity of an aromatic peak; I
L
represents a signal intensity of an aliphatic hydrocarbon peak; and I
C
represents a signal intensity of an alicyclic hydrocarbon peak.
With the above process, it is possible to produce activated carbon for an electrode of a low electrostatic capacity revealing voltage and a high electrostatic capacity density (F/cc). However, if I
L
/I
R
<0.2 or I
C
/I
R
<0.14, the electrostatic capacity density (F/cc) is reduced.
According to the present invention, there is provided a carbon material for use in the production of activated carbon for en electrode of an electric double-layer capacitor, which is a condensed polycyclic aromatic compound having a condensed ring and at least one aliphatic hydrocarbon radical R bonded to the condensed ring, the condensed ring including at least one alicyclic hydrocarbon structure moiety, the condensed polycyclic aromatic compound providing, as a result of a
13
C-NMR spectroscopy thereof, an analysis chart in which a signal intensity ratio I
L
/I
R
is equal to or larger than 0.2, and a signal intensity ratio I
C
/I
R
is equal to or larger than 0.14, wherein I
R
represents a signal intensity of an aromatic peak; I
L
represents a signal intensity of an aliphatic hydrocarbon peak; and I
C
represents a signal intensity of an alicyclic hydrocarbon peak.
This carbon material is suitable as a source material for activated carbon for an electrode, as described above.
REFERENCES:
patent: 6547990 (2003-04-01), Shinozaki et al.
patent: 2002/0052293 (2002-05-01), Tsuryya et al.
patent: 2002/0075627 (2002-06-01), Shinozaki et al.
patent: 2002/0102464 (2002-08-01), Yoshida et al.
patent: 2002/0126439 (2002-09-01), Sato et al.
patent: 2000-77273 (2000-03-01), None
Fujino Takeshi
Noguchi Minoru
Oyama Shigeki
Sato Kenji
Arent Fox Kintner & Plotkin & Kahn, PLLC
Honda Giken Kogyo Kabushiki Kaisha
Le Thao P
Nelms David
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