An Artificial Polyacrylonitrile Coating Layer Confining Zinc Dendrite Growth for Highly Reversible Aqueous Zinc‐Based Batteries

Aqueous rechargeable zinc‐metal‐based batteries are an attractive alternative to lithium‐ion batteries for grid‐scale energy‐storage systems because of their high specific capacity, low cost, eco‐friendliness, and nonflammability. However, uncontrollable zinc dendrite growth limits the cycle life by...

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Published in:Advanced science Vol. 8; no. 11; pp. e2100309 - n/a
Main Authors: Chen, Peng, Yuan, Xinhai, Xia, Yingbin, Zhang, Yi, Fu, Lijun, Liu, Lili, Yu, Nengfei, Huang, Qinghong, Wang, Bin, Hu, Xianwei, Wu, Yuping, Ree, Teunis
Format: Journal Article
Language:English
Published: Weinheim John Wiley & Sons, Inc 01.06.2021
John Wiley and Sons Inc
Wiley
Subjects:
Carbon
Contact angle
dendrite suppression
Electrolytes
Energy
Graphene
polyacrylonitrile coating
Polymers
Scanning electron microscopy
Spectrum analysis
Zinc
zinc anodes
zinc‐ion batteries
ISSN:2198-3844, 2198-3844
Online Access:Get full text
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Summary:Aqueous rechargeable zinc‐metal‐based batteries are an attractive alternative to lithium‐ion batteries for grid‐scale energy‐storage systems because of their high specific capacity, low cost, eco‐friendliness, and nonflammability. However, uncontrollable zinc dendrite growth limits the cycle life by piercing the separator, resulting in low zinc utilization in both alkaline and mild/neutral electrolytes. Herein, a polyacrylonitrile coating layer on a zinc anode produced by a simple drop coating approach to address the dendrite issue is reported. The coating layer not only improves the hydrophilicity of the zinc anode but also regulates zinc‐ion transport, consequently facilitating the uniform deposition of zinc ions to avoid dendrite formation. A symmetrical cell with the polymer‐coating‐layer‐modified Zn anode displays dendrite‐free plating/stripping with a long cycle lifespan (>1100 h), much better than that of the bare Zn anode. The modified zinc anode coupled with a Mn‐doped V2O5 cathode forms a stable rechargeable full battery. This method is a facile and feasible way to solve the zinc dendrite problem for rechargeable aqueous zinc‐metal batteries, providing a solid basis for application of aqueous rechargeable Zn batteries. A polyacrylonitrile (PAN)Z coating layer is employed to confine zinc dendrite growth for rechargeable aqueous zinc‐based batteries. The cyclability and Coulombic efficiency of the zinc anode porous PAN coating layer show that the polymer coating film is a feasible artificial membrane for a dendrite‐free zinc anode.
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ISSN:2198-3844
2198-3844
DOI:10.1002/advs.202100309