Impact of mechanical bending on the electrochemical performance of bendable lithium batteries with paper-like free-standing V2O5–polypyrrole cathodes

Highly flexible, paper-like, free-standing V2O5 and V2O5–polypyrrole (PPy) films were prepared via the

vacuum filtration method. The films are soft, lightweight, and mechanically robust. The

electrochemical performance of the free-standing pure V2O5 electrode was improved by incorporating

conducting polypyrrole. A bendable cell with a novel design was fabricated, consisting of a freestanding

V2O5–PPy cathode film, gel electrolyte, and a lithium foil anode. The cell was tested under

repeated bending conditions for several cycles. The results show that the battery performance of the

repeatedly bent cell was similar to that of the conventional cell.