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

Xiaoyu Bi, Meichun Li, Guoqiang Zhou, Chaozheng Liu, Runzhou Huang*, Yang Shi, Ben Bin Xu, Zhanhu Guo*, Wei Fan, Hassan Algadi, Shengbo Ge*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

16 Citations (Scopus)
8 Downloads (Pure)

Abstract

The search for wearable electronics has been attracted great efforts, and there is an ever-growing demand for all-solid-state flexible energy storage devices. However, it is a challenge to obtain both positive and negative electrodes with excellent mechanical strength and match positive and negative charges to achieve high energy densities and operate voltages to satisfy practical application requirements. Here, flexible MXene (Ti 3C 2T x)/cellulose nanofiber (CNF) composite film negative electrodes (MCNF) were fabricated with a vacuum filtration method, as well as positive electrodes (CP) by combining polyaniline (PANI) with carbon cloth (CC) using an in-situ polymerization method. Both positive and negative free-standing electrodes exhibited excellent electrochemical behavior and bendable/foldable flexibility. As a result, the all-pseudocapacitance asymmetric device of MCNF//CP assembled with charge-matched between anode and cathode achieves an extended voltage window of 1.5 V, high energy density of 30.6 Wh·kg −1 (1211 W·kg −1), and 86% capacitance retention after 5000 cycles, and the device maintains excellent bendability, simultaneously. This work will pave the way for the development of all-pseudocapacitive asymmetric supercapacitors (ASC) with simultaneously preeminent mechanical properties, high energy density, and wide operating voltage window. [Figure not available: see fulltext.]

Original languageEnglish
Pages (from-to)7696-7709
Number of pages14
JournalNano Research
Volume16
Issue number5
Early online date22 Mar 2023
DOIs
Publication statusPublished - 1 May 2023

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