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Abstract
Aqueous zinc-ion batteries (ZIB) have been subject to intensive research, motivated by the high theoretical specific capacity and relatively low cost of metallic zinc. Nevertheless, cathode dissolution and structural instability result in slow Zn-ion migration dynamics and severe electrode degradation, impeding the development of ZIB. Herein, to our best knowledge, this is the first time a novel 3D bacterial cellulose (BC) network is successfully used as cathodic scaffold to provide sufficient ion pathways and stabilize the host material. Meanwhile, BC hydrogel electrolyte with high ionic conductivity and flexibility enables the use of ZIB in wearable applications. Carbon nanofibers (CNFs)@Mn3O4 are obtained through carbonization of BC network and pre-absorption of Mn salt. The CNFs@Mn3O4/BC electrolyte/Zn full cell possesses a low inner resistance and thus delivers a high capacity of 415.2 mAh g−1 at 0.1 A g−1. Further, the full cell shows excellent coulombic efficiency above 99% and capacity retention of 88.2% after 1000 cycles at high current density of 2 A g−1. The charge storage mechanism and stability of assembled batteries, unveiled via ex-situ characterization, confirm the reversible diffusion of Zn2+. A flexible ZIB fabricated via facile lamination shows an outstanding energy density of 179 mAh g−1 at 1 A g−1, illustrating potential in wearable applications.
Original language | English |
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Article number | 232553 |
Journal | Journal of Power Sources |
Volume | 557 |
Online published | 29 Dec 2022 |
DOIs | |
Publication status | Published - 15 Feb 2023 |
Funding
The study was financially supported by the Research Grants Council of Hong Kong, General Research Fund (Grant no. 11306021).
Research Keywords
- 3D cathodic scaffold
- Flexible device
- Hydrogel electrolytes
- Zinc-ion batteries
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GRF: Understanding Ion Transport in Hydrogel Electrolyte and Charge Transfer on Electrode-Hydrogel Interfaces for Wearable Zinc-Ion Battery
DAOUD, W. (Principal Investigator / Project Coordinator)
1/01/22 → …
Project: Research