Journal
ADVANCED FUNCTIONAL MATERIALS
Volume 30, Issue 43, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adfm.202003932
Keywords
cycling stability; interfaces; PEO polymer additives; Zn anodes
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Funding
- U.S. Department of Energy (DOE), Office of Basic Energy Sciences, Division of Materials Sciences and Engineering [KC020105-FWP12152]
- Office of Biological and Environmental Research at PNNL
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Zn dendrites growth and poor cycling stability are significant challenges for rechargeable aqueous Zn batteries. Zn metal deposition-dissolution in aqueous electrolytes is typically determined by Zn anode-electrolyte interfaces. In this work, the role of a long-chain polyethylene oxide (PEO) polymer as a multifunctional electrolyte additive in stabilizing Zn metal anodes is reported. PEO molecules suppress Zn(2+)ion transfer kinetics and regulate Zn(2+)ion concentration in the vicinity of Zn anodes through interactions between ether groups of PEO and Zn(2+)ions. The suppressed Zn(2+)ion transfer kinetics and homogeneous Zn(2+)ion distribution at the interface promotes dendrite-free homogeneous Zn deposition. In addition, electrochemically inert PEO molecules adsorbed onto Zn anodes can protect the anode surfaces from H(2)generation and, thereby, enhance their electrochemical stability. Stable cycling over 3000 h and high reversibility (Coulombic efficiency> 99.5%) of Zn anodes is demonstrated in 1mZnSO(4)electrolyte with 0.5 wt% PEO. This finding provides helpful insights into the mechanism of Zn metal anodes stabilization by low-cost multifunctional polymer electrolyte additives that stabilize interfacial reactions.
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