Monolithic Ionogel With Biopolymer Matrix, and Method for Manufacturing Same

• Main Authors: CERCLIER CAROLE, BUCHTOVA NELA, GIRARD PHILIPPE-FRANCK, GUYOMARD-LACK AURÉLIE, LE BIDEAU JEAN, AYME-PERROT DAVID
• Format: Patent
• Language: English
• Published: 09.06.2016
• Subjects: BASIC ELECTRIC ELEMENTS; ELECTRICITY; PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSIONOF CHEMICAL INTO ELECTRICAL ENERGY

The invention relates to a monolithic ionogel with an organic confinement matrix for at least one ionic liquid, and a method for manufacturing same. An ionogel according to the invention comprises a biopolymer confinement matrix with a cross-linked polysaccharide base and an ionic liquid confined in a network formed by the matrix, and it is such that the polysaccharide has siloxane cross-linking bridges, the ionogel being a chemical gel able to constitute a self-supported solid electrolyte by itself. This ionogel is obtained using a method comprising silanisation of the polysaccharide in a basic aqueous solution by a silanisation agent, and polycondensation of the silanised polysaccharide. In a first embodiment, this method comprises preparing a hydrogel with a polysaccharide base that is silanised and cross-linked by sol-gel, then exchange reactions of solvents with increasing hydrophobicities. In a second preferred embodiment, it comprises mixing a first solution comprising the ionic liquid in an acid medium and a second solution containing the silanised and non-cross-linked polysaccharide, such that its cross-linking takes place through that mixing.