Electrodeposition of MnO2 nanoflakes onto carbon nanotube film towards high-performance flexible quasi-solid-state Zn-MnO2 batteries

Flexible aqueous zinc-ion batteries are promising to satisfy the booming wearable electronics. Herein, a facile, scalable, and cost-effective method (one-step electrodeposition) is developed to grow MnO2 nanoflakes onto carbon nanotube (CNT) film. The binder-free self-supporting CNT@MnO2 film can ta...

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Bibliographic Details
Published in:Journal of electroanalytical chemistry (Lausanne, Switzerland) Switzerland), 2020-09, Vol.873, p.114392, Article 114392
Main Authors: Huang, Aixiang, Chen, Jizhang, Zhou, Weijun, Wang, Anran, Chen, Minfeng, Tian, Qinghua, Xu, Junling
Format: Article
Language:English
Subjects:
Aqueous energy storage
Battery cycles
Binder-free electrodes
Carbon nanotubes
Electrodeposition
Electronics
Manganese dioxide
Manganese dioxide nanoflakes
Rechargeable batteries
Solid state
Wearable technology
Zinc
Zinc-ion batteries
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Summary:Flexible aqueous zinc-ion batteries are promising to satisfy the booming wearable electronics. Herein, a facile, scalable, and cost-effective method (one-step electrodeposition) is developed to grow MnO2 nanoflakes onto carbon nanotube (CNT) film. The binder-free self-supporting CNT@MnO2 film can take advantages of highly conductive CNT scaffold and nanostructure of MnO2, thus leading to facilitated electrochemical kinetics. Based on the CNT@MnO2 film, a flexible quasi-solid-state Zn-MnO2 battery is assembled and achieves high reversible capacity of 292.7 mAh g−1 (corresponding to 16.5 mWh cm−3) at 0.2 mA cm−2, great rate capability (105.6 mAh g−1 at 3 mA cm−2), and excellent cycling stability (no capacity fading after 1000 cycles). The quasi-solid-state Zn-MnO2 battery also shows high tolerance to mechanical bending. With these merits, the CNT@MnO2 film holds great potential for Zn-MnO2 batteries to power wearable electronics. [Display omitted] •A facile one-step electrodeposition is used to grow α-MnO2 nanoflakes on CNT film.•The product shows fast electrochemical kinetics and high Zn2+ diffusion coefficient.•A flexible quasi-solid-state aqueous zinc ion battery is assembled.•High specific capacity, great rate capability, and excellent cyclability are obtained.•The battery exhibits high tolerance to mechanical bending.
ISSN:1572-6657
1873-2569
DOI:10.1016/j.jelechem.2020.114392