Despite their potential as a next-generation alternative to current state-of-the-art lithium (Li)-ion batteries, rechargeable aqueous zinc (Zn)-ion batteries still lag in practical use due to their low energy density, sluggish redox kinetics, and limited cyclability. In sharp contrast to previous studies that have mostly focused on materials development, herein, a new electrode architecture strategy based on a 3D bicontinuous heterofibrous network scaffold (HNS) is presented. The HNS is an intermingled nanofibrous mixture composed of single-walled carbon nanotubes (SWCNTs, for electron-conduction channels) and hydrophilic cellulose nanofibers (CNFs, for electrolyte accessibility). As proof-of-concept for the HNS electrode, manganese dioxide (MnO2) particles, one of the representative Zn-ion cathode active materials, are chosen. The HNS allows uniform dispersion of MnO2 particles and constructs bicontinuous electron/ion conduction pathways over the entire HNS electrode (containing no metallic foil current collectors), thereby facilitating the redox kinetics (in particular, the intercalation/deintercalation of Zn2+ ions) of MnO2 particles. Driven by these advantageous effects, the HNS electrode enables substantial improvements in the rate capability, cyclability (without structural disruption and aggregation of MnO2), and electrode sheet-based energy (91 Wh kgelectrode−1)/power (1848 W kgelectrode−1) densities, which lie far beyond those achievable with conventional Zn-ion battery technologies.
|Publication status||Published - 2020 Nov 1|
Bibliographical noteFunding Information:
This work was supported by the Basic Science Research Program (2018R1A2A1A05019733 and 2016R1A5A1009926) through the National Research Foundation of Korea (NRF) funded by the Ministry of Science, ICT, and future Planning.
© 2020 Wiley-VCH GmbH
All Science Journal Classification (ASJC) codes
- Materials Science(all)