Electrochemical device which can be used for energy storage
AssigneeThomson-CSF
InventorsJean C. Dubois, Gerard Tourillon, Francis Garnier
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Abstract
The invention relates to electrochemical devices and in particular energy storage devices. The object of the invention is the use in such devices of at least one conductive support, covered by a polymer film, obtained by electrochemical polymerization of at least one monomer having at least one aromatic heterocycle with five links containing a single heteroatom, the polymer being in accordance with the general formula: (M.sup.+ X.sup.- y)n. The basic monomer is a pyrrole, thiophene, furan or indole and is substituted by at least one group of the alkyl, alkoxyl, hydroxyl aryl, substituted aryl, halogen, methyl trihalide, cyano, amino or dialkylamino type.
Claims14
An electrochemical device comprising
- a cell containing an electrolyte suspended in a solvent and
- at least a first and a second electrode in contact with this electrolyte,
- whereby at least the first electrode has a polymer film on a conductive support, said film being obtained by electrochemical polymerization of at least one monomer M, said polymer having a conductivity of 10.sup.-2 to 10.sup.+2 ohm.sup.-1 cm.sup.-1 and complying with the general formula
- (M.sup.+ X.sup.- y).sub.n
- in which
- X.sup.- represents an anion obtained from the electrolyte used during the polymerization process,
- y is the anion proportion related to one mole of monomer and is 0.1 to 0.5, and
- n the degree of polymerization, wherein the monomer is either
- (a) an heterocycle substituted by at least one of the groups R.sub.1 and R.sub.2, of the formula ##STR7## with X=O, and R.sub.1 and
- R.sub.2 are alkyl, alkoxyl, hydroxyl, aryl, substituted aryl, halogen, methyl trihalide, cyano amino or dialkylamino.
Dependencies are inferred from the claim text.