A Chemically Self-Charging Flexible Solid-State Zinc-Ion Battery Based on VO2 Cathode and Polyacrylamide–Chitin Nanofiber Hydrogel Electrolyte

Chaozheng Liu, Wangwang Xu, Changtong Mei, Meichun Li, Weimin Chen, Shu Hong, Won Yeong Kim, Sang young Lee, Qinglin Wu

Research output: Contribution to journalArticlepeer-review

81 Citations (Scopus)

Abstract

Conventional self-charging systems are generally complicated and highly reliant on the availability of energy sources. Herein, a chemically self-charging, flexible solid-state zinc ion battery (ssZIB) based on a vanadium dioxide (VO2) cathode and a polyacrylamide-chitin nanofiber (PAM-ChNF) hydrogel electrolyte is developed. With a power density of 139.0 W kg-1, the ssZIBs can deliver a high energy density of 231.9 Wh kg-1. The superior electrochemical performance of the ssZIBs is attributed to the robust tunnel structure of the VO2 cathode and the entangled network of PAM-ChNF electrolyte, which provide efficient pathways for ion diffusion. Impressively, the designed ssZIBs can be chemically self-charged by the redox reaction between the cathode and oxygen in ambient conditions. After oxidation for 6 h in air, the ssZIBs manifest a high discharging capacity of 263.9 mAh g-1 at 0.2 A g-1, showing excellent self-rechargeability. With the assistance of a small amount of acetic acid added to the hydrogel electrolyte, the galvanostatic discharging and chemical self-charging cycles can reach 20. More importantly, such ssZIBs are able to operate well at chemical or/and galvanostatic charging hybrid modes, demonstrating superior reusability. This work brings a new prospect for designing flexible chemically self-charging ssZIBs for portable self-powered systems.

Original languageEnglish
Article number2003902
JournalAdvanced Energy Materials
Volume11
Issue number25
DOIs
Publication statusPublished - 2021 Jul 8

Bibliographical note

Publisher Copyright:
© 2021 Wiley-VCH GmbH

All Science Journal Classification (ASJC) codes

  • Renewable Energy, Sustainability and the Environment
  • General Materials Science

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