Journal
JOURNAL OF MATERIALS CHEMISTRY A
Volume 8, Issue 38, Pages 20175-20184Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/d0ta07348b
Keywords
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Funding
- Research Grants Council of the Hong Kong Special Administrative Region, China [T23-601/17-R]
- HKUST Fund of Nanhai [FSNH-18FYTRI01]
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Zinc is a promising anode material for rechargeable aqueous batteries owing to its high specific capacity, low cost, and environmental friendliness. However, the uncontrollable Zn dendrite growth remains a grand challenge that hinders the practical application of this type of electrode. Here, we create a functional porous polybenzimidazole (PBI) nanofiber layer onto a Cu surface as the substrate of the Zn anode to mitigate dendrite formation. The PBI nanofibers with abundant N-containing functional groups not only allow uniform Zn nucleation on the Cu surface but also facilitate uniform transport of Zn(2+)ionsviaelectrokinetic conduction, leading to a dendrite-free Zn deposition and thus, a highly reversible Zn plating/stripping process. As a result, a symmetric cell equipped with this newly developed Zn electrode is stably cycled for over 1000 cycles without short-circuits at a current density of 10 mA cm(-2). More impressively, when paired with a MnO(2)cathode, the full cell delivers a nearly 100% capacity retention after 1000 cycles at 1 A g(-1)with a specific capacity of about 150 mA h g(-1). These results demonstrate that the functional porous PBI nanofiber layer created in this work stands to both dramatically extend battery cycle life and boost battery performance.
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