Unlocking the capacity of iodide for high-energy-density zinc/polyiodide and lithium/polyiodide redox flow batteries
- 16 February 2017
- journal article
- research article
- Published by Royal Society of Chemistry (RSC) in Energy & Environmental Science
- Vol. 10 (3), 735-741
- https://doi.org/10.1039/c6ee03554j
Abstract
Highly soluble iodide/triiodide (I−/I3 −) couples are one of the most promising redox-active species for high-energy-density electrochemical energy storage applications. However, to ensure high reversibility, only two-thirds of the iodide capacity is accessed and one-third of the iodide ions act as a complexing agent to stabilize the iodine (I2), forming I3 − (I2I−). Here, we exploit bromide ions (Br−) as a complexing agent to stabilize the iodine, forming iodine–bromide ions (I2Br−), which frees up iodide ions and increases the capacity. Applying this strategy, we demonstrate a novel zinc/iodine–bromide battery to achieve an energy density of 101 W h Lposolyte+negolyte −1 (or 202 W h Lposolyte −1), which is the highest energy density achieved for aqueous flow batteries to date. This strategy can be further generalized to nonaqueous iodide-based batteries (i.e. lithium/polyiodide battery), offering new opportunities to improve high-energy iodide-based energy storage technologies.Keywords
Funding Information
- Innovation and Technology Commmission (ITS/248/14FP)
- Research Grants Council, University Grants Committee, Hong Kong (CUHK14200615, T23-407/13-N)
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