High-performance flexible all-solid-state asymmetric supercapacitors based on binder-free MXene/cellulose nanofiber anode and carbon cloth/polyaniline cathode

Abstract The search for wearable electronics has been attracted great efforts, and there is an ever-growing demand all-solid-state flexible energy storage devices. However, it a challenge to obtain both positive negative electrodes with excellent mechanical strength match charges achieve high densities operate voltages satisfy practical application requirements. Here, MXene (Ti 3 C 2 T x )/cellulose nanofiber (CNF) composite film (MCNF) were fabricated vacuum filtration method, as well (CP) by combining polyaniline (PANI) carbon cloth (CC) using in-situ polymerization method. Both free-standing exhibited electrochemical behavior bendable/foldable flexibility. As result, the all-pseudocapacitance asymmetric device of MCNF//CP assembled charge-matched between anode cathode achieves extended voltage window 1.5 V, density 30.6 Wh·kg −1 (1211 W·kg ), 86% capacitance retention after 5000 cycles, maintains bendability, simultaneously. This work will pave way development all-pseudocapacitive supercapacitors (ASC) simultaneously preeminent properties, density, wide operating window.