Electrolysis: processes – compositions used therein – and methods – Electrolytic synthesis – Preparing organic compound
Reexamination Certificate
2000-03-20
2001-07-03
Phasge, Arun S. (Department: 1741)
Electrolysis: processes, compositions used therein, and methods
Electrolytic synthesis
Preparing organic compound
C205S431000, C205S688000
Reexamination Certificate
active
06254761
ABSTRACT:
BACKGROUND OF THE INVENTIONS
The present invention relates to a method of preparing a conductive polymer material for an electrode and a method of forming an electrode using a conductive polymer material, and more particularly to a method of producing a conductive material suitable for a mass-synthesis thereof at a high yield and a method of forming an electrode at a high productivity.
A conductive material has been developed which is to be formed on a surface of an electrode for a secondary battery or a capacitor. The conductive polymer material has been prepared as follows.
FIG. 1
is a view illustrative of a conventional method of preparing the conductive polymer material. An organic compound
2
is dissolved into an electrolytic solution
3
, wherein the organic compound
2
comprises a monomer or a low molecular weight polymer of organic molecules which have a skeleton allowing formation of a conductive polymer material. A collector
1
is dipped into the electrolytic solution
3
dissolved with the organic compound
2
in order to cause an electrolytic polymerization of the above monomers or the above low molecular weigh, thereby obtaining a conductive polymer material. If the obtained conductive polymer material is soluble to the electrolytic solution, the conductive polymer material dissolved in the electrolytic solution is then subjected to a solvent extraction so as to isolate the conductive polymer material from the electrolytic solution.
The conventional method of producing the conductive polymer material has the following problems. The organic compound
2
shows a reaction on the collector
1
. In this reaction, a diffusion process is caused where the organic compound
2
is diffused in the electrolytic solution
3
up to the collector
1
. A diffusion rate or a diffusion speed depends upon the organic compound
2
and a solvent of the electrolytic solution
3
. In general, the diffusion rate is slow and is a rate-determining step of polymerization. The rate of the polymerization depends upon a concentration of the organic compound
2
. If a solubility of the organic compound to the solvent of the electrolytic solution
3
is low, it is difficult to obtain a high concentration of the organic compound
2
in the electrolytic solution
3
, for which reason a current density in polymerization process or a polymerization current density is low, whereby it is difficult to obtain a high productivity or a high yield of polymerization. Namely, the conventional method is engaged with the problem in low polymerization yield in the electrolytic polymerization.
The above conventional method illustrated in
FIG. 1
has a further problem as follows. An amount of the organic compound
2
soluble into the solvent for the electrolytic solution
3
is limited. Namely, the organic compound
2
has a maximum solubility into the solvent for the electrolytic solution
3
. If the maximum solubility of the organic compound
2
into the solvent for the electrolytic solution
3
is low, then it is difficult to realize a moss-synthesis.
Consequently, the conventional method of producing the conductive polymer is disadvantageous in low yield and low productivity, and a difficulty in mass-synthesis.
In the above circumstances, it had been required to develop a novel method of producing a conductive polymer free from the above problem.
SUMMARY OF THE INVENTION
Accordingly, it is an object of the present invention to provide a novel method of producing a conductive polymer free from the above problems.
It is a further object of the present invention to provide a novel method of producing a conductive polymer at a high yield.
It is a still further object of the present invention to provide a novel method of producing a conductive polymer at a high productivity.
It is yet a furher object of the present invention to provide a novel method of producing a conductive polymer, which is suitable for mass-synthesis.
It is moreover object of the present invention to provide a novel method of forming an electrode using a conductive polymer free from the above problems.
It is still more object of the present invention to provide a novel method of forming an electrode using a conductive polymer at a high yield.
It is yet more object of the present invention to provide a novel method of forming an electrode using a conductive polymer at a high productivity.
In accordance with the first present invention, a method of producing a conductive polymer comprises the following steps. An organic compound is deposited on a surface of a collector, wherein the organic compound has a polymerizability and is in a solid-state. The collector is made into contact with an electrolytic solution thereby to cause an electrolytic polymerization of said organic compound. As a result, large amount of reacted substances exist on the surface of the collector. The organic compound in the solid-state has been deposited on the collector before the collector is dipped into the electrolytic solution, whereby the electrolytic polymerization of the organic compound is caused. The organic compound in the solid-state is in contact with the collector in the electrolytic polymerization. This means that the organic compound is in contact with the collector at a high concentration, whereby a large current density of the electrolytic polymerization can be obtained, so that a productivity can be improved. Namely, in accordance with a novel method of producing a conductive polymer, a polymerizable organic compound in a solid-state on a collector is in contact with an electrolytic solution to cause an electrolytic polymerization of the organic compound at a high current density of the electrolytic polymerization, so that a productivity can be improved.
The above and other objects, features and advantages of the present invention will be apparent from the following descriptions.
REFERENCES:
patent: 5876586 (1999-03-01), Fukushima et al.
Fujiwara Masaki
Harada Gaku
Kurosaki Masato
Nishiyama Toshihiko
Okada Shinako
NEC Corporation
Phasge Arun S,.
Young & Thompson
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