Dendrite‐Free Zn/rGO@CC Composite Anodes Constructed by One‐Step Co‐Electrodeposition for Flexible and High‐Performance Zn‐Ion Batteries

Aqueous zinc‐ion batteries (ZIBs) with good flexibility have attracted great demands for portable and wearable electronics. However, the low Coulombic efficiency and poor cycling performance caused by uncontrolled Zn dendrite growth limit their practical applications. Herein, a novel strategy is pro...

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Bibliographic Details
Published in:Advanced functional materials 2023-10, Vol.33 (42)
Main Authors: Wang, Qunhao, Zhao, Jiangqi, Zhang, Jian, Xue, Xiaolin, Li, Mei, Sui, Zengyan, Zhang, Xi, Zhang, Wei, Lu, Canhui
Format: Article
Language:English
Subjects:
Anodes
Batteries
Electric fields
Electrical resistivity
Electrodeposition
Flexibility
Graphene
Ion flux
Low voltage
Manganese dioxide
Materials science
Portable equipment
Reduction
Substrates
Wearable technology
Wettability
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Summary:Aqueous zinc‐ion batteries (ZIBs) with good flexibility have attracted great demands for portable and wearable electronics. However, the low Coulombic efficiency and poor cycling performance caused by uncontrolled Zn dendrite growth limit their practical applications. Herein, a novel strategy is proposed to construct a flexible and dendrite‐free composite anode by one‐step co‐electrodeposition. Interestingly, the reduction of Zn 2+ ions to Zn nanoflakes is synchronously accompanied by graphene oxide reduction, leading to a composite anode comprised of Zn with an interpenetrated conductive network of reduced graphene oxide (rGO) on a carbon cloth (CC) substrate, namely Zn/rGO@CC. The 3D rGO network not only improves the electrical conductivity and wettability of the composite anode to lower the interfacial resistance but also homogenizes the electric field distribution and Zn 2+ ion flux, thus effectively inhibiting the growth of Zn dendrites. As expected, the Zn/rGO@CC anode exhibits long cycle stability for nearly 1000 h at 1 mA cm −2 with low voltage hysteresis. Furthermore, the Zn/rGO@CC composite anode provides the corresponding aqueous Zn||MnO 2 full cells with remarkable rate capability and stunning long‐term durability. The as‐fabricated quasi‐solid‐state ZIBs also demonstrate coveted flexibility, showing high potential in future wearable and portable electronic devices.
ISSN:1616-301X
1616-3028
DOI:10.1002/adfm.202306346