SHEET-SHAPED FLEXIBLE ELECTRODE AND METHOD FOR PRODUCING THE SAME

A sheet-shaped flexible electrode includes a thermoplastic elastomer including a styrene-based thermoplastic elastomer or including a styrene-based thermoplastic elastomer and an olefin-based thermoplastic elastomer, and a conductive material containing carbon black, and has a thickness of 50 µm or more and 500 µm or less. The melt viscosity of the thermoplastic elastomer at 200°C in a low shear region with a shear rate of 60 s or more and 200 s or less is 100 Pa·s or more and 800 Pa·s or less, and is four times or less the melt viscosity of the thermoplastic elastomer at the same temperature in a high shear region with a shear rate of 1000 s or more and 1220 s or less. An amount of DBP absorbed by the carbon black is 300 cm/100 g or more. The sheet-shaped flexible electrode is produced by extrusion molding or injection molding of an elastomer composition containing the thermoplastic elastomer and the conductive material.