FLEXIBLE ELECTROCHEMICAL CELL WITH CONTROLLED OPTICAL ABSORPTION AND REFLECTION HAVING AN AQUEOUS ELECTROLYTE

摘要

The invention concerns a thin film electrochemical cell with aqueous electrolyte, having variable emissivity in the infrared (absorption and reflection) based on an applied control voltage. It consists of the following flexible stacked elements respectively in close contact: a first current collector (11) made of an electrically conductive material designed to be connected to a first potential of the control voltage; a porous counter-electrode (12) made from a mixture of vinylidene fluoride and hexafluoropropylene copolymer, known as PVDF-HFP, ethylene polyoxide, known as PEO and a powder of a compound comprising ions complementary of an insertion material (i.e., an interlayer); a porous separator (13) made from a mixture of PVDF-HFP and PEO; a second current collector (14) made of an electrically conductive material, designed to be connected to a second potential of the control voltage and adapted to be run through by ions; an electronically conductive porous layer (15) made from a mixture of PVDF-HFP, PEO and a powder of insertion material (i.e., an interlayer);. The aqueous electrolyte medium enables faster ion exchange resulting from higher ionic conductivity levels due to the high dissociation constant of water. Other advantages of water consist in its transparency in the infrared and its ecological character. The production of such an aqueous cell requires finding an adapted polymer and the use thereof.