Chemistry: electrical current producing apparatus – product – and – Current producing cell – elements – subcombinations and... – Include electrolyte chemically specified and method
Reexamination Certificate
1999-04-05
2001-10-09
Griffin, Steven P. (Department: 1754)
Chemistry: electrical current producing apparatus, product, and
Current producing cell, elements, subcombinations and...
Include electrolyte chemically specified and method
C429S212000, C429S213000, C429S214000, C429S215000, C429S216000, C429S217000
Reexamination Certificate
active
06300015
ABSTRACT:
BACKGROUND OF THE INVENTION
The present invention relates to a polymer battery having electrodes for fetching electrical energy due to electron transfers in oxidation-reduction reaction of compound and either a solid electrolyte or a gel-solid electrolyte, and a method of forming the same.
FIG. 1
is a cross sectional elevation view illustrative of a structure of a conventional proton conductive polymer battery. The conventional proton conductive polymer battery has a positive electrode
102
on a positive collector
101
, and a negative electrode
104
on a negative collector
103
as well as a separator through which the positive electrode
102
and the negative electrode
104
are combined with each other.
FIG. 2
is a cross sectional elevation view illustrative of a conventional structure of the positive electrode on the positive collector. A positive electrode
102
is provided on a positive collector
101
. The positive electrode
102
comprises a positive electrode active material
106
and an electrically conductive material
107
as well as an electrolyte solution
108
into which the positive electrode active material
106
and the electrically conductive material
107
are immersed. A carbon black is available for the electrically conductive material
107
. The positive electrode active material
106
comprises such a polymer that only absorption and desorption of proton contribute to an oxidation-reduction reaction. The positive electrode active material
106
is doped with a dopant for allowing the polymer of the positive electrode active material
106
to exhibit an electrical conductivity. Both organic compounds and inorganic compounds are available for the dopant to be doped into the positive electrode active material
106
. The kinds of the available dopants are unlimited unless the doping is difficult. Solutions and non-solutions containing proton source materials are available for the electrolyte solution
108
.
FIG. 3
is a cross sectional elevation view illustrative of a conventional structure of the negative electrode on the negative collector. A negative electrode
104
is provided on negative collector
103
. The negative electrode
102
comprises a negative electrode active material
109
and an electrically conductive material
107
as well as an electrolyte solution
108
into which the negative electrode active material
109
and the electrically conductive material
107
are immersed. A carbon black is available for the electrically conductive material
107
. The negative electrode active material
109
comprises such a polymer that only absorption and desorption of proton contribute to an oxidation-reduction reaction. The negative electrode active material
109
is doped with a dopant for allowing the polymer of the negative electrode active material
109
to exhibit an electrical conductivity. Both organic compounds and inorganic compounds are available for the dopant to be doped into the negative electrode active material
109
. The kinds of the available dopants are unlimited unless the doping is difficult. Solutions and non-solutions containing proton source materials are available for the electrolyte solution
108
.
The conventional battery with the negative electrode active material of the nitrogen containing quinoid compound or derivatives thereof has the following disadvantages. First, the cyclic characteristics are lowered. Second, the capacitance is small. Third, the rapid charge and discharge are impossible. Fourth, the spontaneous discharge is caused.
FIG. 4
is a cross sectional elevation view illustrative of an elution of the negative electrode active material into the electrolytic solution in the conventional battery.
SUMMARY OF THE INVENTION
Accordingly, it is an object of the present invention to provide a novel dopant to be doped into a positive electrode active material free from the above problems.
It is a further object of the present invention to provide a novel positive electrode active material free from the above problems.
It is a still further object of the present invention to provide a novel proton conductive polymer battery improved in cyclic characteristics.
It is yet a further object of the present invention to provide a novel proton conductive polymer battery with an increased capacitance.
It is a further more object of the present invention to provide a novel proton conductive polymer battery capable of rapid charge and discharge.
It is still more object of the present invention to provide a novel proton conductive polymer battery capable of suppressing spontaneous discharge.
The present invention provides a positive electrode active material doped with a dopant comprising an anion having the same or similar molecular structure as a polymer matrix of at least one of a solid electrolyte and a gel solid electrolyte.
The above and other objects, features and advantages of the present invention will be apparent from the following descriptions.
REFERENCES:
patent: 4801195 (1989-01-01), Kawai et al.
patent: 5002700 (1991-03-01), Otagawa et al.
patent: 5023149 (1991-06-01), MacDiarmid et al.
patent: 5454147 (1995-10-01), Kobayashi et al.
patent: 5473503 (1995-12-01), Sakata et al.
patent: 5756230 (1998-05-01), Gao et al.
patent: 5798905 (1998-08-01), Nishiyama et al.
patent: 6099989 (2000-08-01), Harada et al.
patent: 0 108 954 (1984-05-01), None
patent: 2 124 635 (1984-02-01), None
Fuziwara Masaki
Harada Gaku
Nishiyama Toshihiko
Okada Shinako
Griffin Steven P.
NEC Corporation
Strickland Jonas N.
Young & Thompson
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