Journal
NANO LETTERS
Volume 21, Issue 9, Pages 4129-4135Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.nanolett.1c01277
Keywords
zinc-iodine battery; double-layered cathode; polypyrrole; Coulombic eftciency; voltage efficiency
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Funding
- Merced nAnomaterials Center for Energy and Sensing (MACES), a NASA [NNX15AQ01A]
- Jiangsu Overseas Visiting Scholar Program for University Prominent Young and Midaged Teachers and Presidents
- NASA [801189, NNX15AQ01A] Funding Source: Federal RePORTER
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By utilizing a double-layered cathode structure, the undesired shuttling of triiodide ions has been successfully suppressed, resulting in outstanding Coulombic efficiency and voltage efficiency for ZIBs. These findings offer new insights for the design and fabrication of ZIBs and other batteries based on conversion reactions.
Aqueous rechargeable zinc-iodine batteries (ZIBs) are promising candidates for grid energy storage because they are safe and low-cost and have high energy density. However, the shuttling of highly soluble triiodide ions severely limits the device's Coulombic efficiency. Herein, we demonstrate for the first time a double-layered cathode configuration with a conductive layer (CL) coupled with an adsorptive layer (AL) for ZIBs. This unique cathode structure enables the formation and reduction of adsorbed I-3(-) ions at the CL/AL interface, successfully suppressing triiodide ion shuttling. A prototypical ZIB using a carbon cloth as the CL and a polypyrrole layer as the AL simultaneously achieves outstanding Coulombic efficiency (up to 95.6%) and voltage efficiency (up to 91.3%) in the aqueous ZnI2 electrolyte even at high-rate intermittent charging/discharging, without the need of ion selective membranes. These findings provide new insights to the design and fabrication of ZIBs and other batteries based on conversion reactions.
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