▎ 摘　　要

NOVELTY - A solid-fuel battery electrolyte (1) comprises 20 %mass or more graphene oxide and 0.5 mmol/g sulfo group. USE - Electrolyte is used for solid-fuel battery cell (all claimed). ADVANTAGE - The electrolyte has excellent electrolytic proton conductivity, electrical insulation property and gas-barrier property, and provides solid-fuel battery cell with excellent battery performance. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for solid-fuel battery cell, which is obtained by stacking the electrolyte. DESCRIPTION OF DRAWING(S) - The drawing shows the sectional view of fuel cell. Solid-fuel battery electrolyte (1) Catalyst (2) Fuel electrode (3) Air electrode (4) Separator (5)