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A long-lifespan, flexible zinc-ion secondary battery using a paper-like cathode from single-atomic layer MnO2 nanosheets

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Abstract

Aqueous zinc ion secondary batteries (ZIBs) have recently attracted considerable attention and global interest due to their low cost, aqueous-based nature and great safety. Unfortunately, the intrinsic properties of poor cycle life, low energy density and uncontrolled dendrite growth during the charge/discharge process for metallic Zn anodes significantly hinder their practical application. In this work, we rationally designed two-dimensional (2D) δ-MnO2 nanofluidic channels by the ordered restacking of exfoliated MnO2 single atomic layers, which exhibited a high zinc ion transport coefficient (1.93 × 10−14 cm2 s−1) owing to their appropriate d-spacing and the negative charge of the inner channel walls. More importantly, we found that Zn dendrite growth was prevented in the as-assembled ZIBs, resulting in superior stability compared with the bulk-MnO2 sample. Our design sheds light on developing high-performance ZIBs from two-dimensional nanofluidic channels, and this strategy might be applicable to the storage of other metal ions (Mg2+, Ca2+, Al3+, etc.) in next-generation electrochemical energy storage devices.

Graphical abstract: A long-lifespan, flexible zinc-ion secondary battery using a paper-like cathode from single-atomic layer MnO2 nanosheets

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Publication details

The article was received on 20 Aug 2019, accepted on 23 Sep 2019 and first published on 30 Sep 2019


Article type: Paper
DOI: 10.1039/C9NA00519F
Nanoscale Adv., 2019, Advance Article
  • Open access: Creative Commons BY-NC license
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    A long-lifespan, flexible zinc-ion secondary battery using a paper-like cathode from single-atomic layer MnO2 nanosheets

    Y. Wang, Z. Wu, L. Jiang, W. Tian, C. Zhang, C. Cai and L. Hu, Nanoscale Adv., 2019, Advance Article , DOI: 10.1039/C9NA00519F

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