PROTON-CONDUCTIVE BODY AND ELECTROCHEMICAL ELEMENT USING THE PROTON-CONDUCTIVE BODY

摘要

PROBLEM TO BE SOLVED: To provide a conductive body excellent in proton conductivity and workability, by using a compound mainly composed of silicon oxide and a Bronsted acid, and a sulfonate of a block copolymer composed of conjugate diene units and aromatic vinyl units. SOLUTION: A compound mainly composed of silicon oxide and a Bronsted acid is used as an inorganic compound used for a proton-conductive body. An organic compound comprising sulfonate as a block copolymer composed of conjugate diene units and aromatic vinyl units is used as a binder. Preferably, phosphoric acid or its derivative is used as the Bronsted acid added to silicon oxide. The Bronsted acid acts as a donor of protons and the silicon oxide has a structure with -OH groups joined to its surface in high concentration as end groups. Because protons in the -OH groups perform proton hopping motion, high proton conductivity is exhibited. This proton-conductive body is effective as electrolyte for electrochemical elements.