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Title: Ambipolar zinc-polyiodide electrolyte for a high-energy density aqueous redox flow battery

Abstract

Large-scale energy storage systems are crucial for substantial deployment of renewable energy sources. Energy storage systems with high energy density, high safety, and low cost and environmental friendliness are desired. To overcome the major limitations of the current aqueous redox flow battery systems, namely lower energy density (~25 Wh L -1) and presence of strong acids and/or other hazardous, a high energy density aqueous zinc/polyiodide flow battery (ZIB) is designed with near neutral ZnI 2 solutions as catholytes. The energy density of ZIB could reach 322 Wh L -1 at the solubility limit of ZnI 2 in water (~7 M). We demonstrate charge and discharge energy densities of 245.9 Wh/L and 166.7 Wh L-1 with ZnI 2 electrolyte at 5.0 M, respectively. The addition of ethanol (EtOH) in ZnI 2 electrolyte can effectively mitigate the growth of zinc dendrite at the anode and improve the stability of catholytes with wider temperature window (-20 to 50°C), which enable ZIB system to be a promising alternative as a high-energy and high- safety stationary energy storage system.

Authors:
 [1];  [1];  [1];  [1];  [1];  [1];  [1]
  1. Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
Publication Date:
Research Org.:
Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
Sponsoring Org.:
USDOE Office of Electricity Delivery and Energy Reliability (OE)
OSTI Identifier:
1184933
Report Number(s):
PNNL-SA-103966
Journal ID: ISSN 2041-1723; TE1400000
Grant/Contract Number:
AC05-76RL01830; 57558
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
Nature Communications
Additional Journal Information:
Journal Volume: 6; Journal ID: ISSN 2041-1723
Publisher:
Nature Publishing Group
Country of Publication:
United States
Language:
English

Citation Formats

Li, Bin, Nie, Zimin, Vijayakumar, M., Li, Guosheng, Liu, Jun, Sprenkle, Vincent L., and Wang, Wei. Ambipolar zinc-polyiodide electrolyte for a high-energy density aqueous redox flow battery. United States: N. p., 2015. Web. doi:10.1038/ncomms7303.
Li, Bin, Nie, Zimin, Vijayakumar, M., Li, Guosheng, Liu, Jun, Sprenkle, Vincent L., & Wang, Wei. Ambipolar zinc-polyiodide electrolyte for a high-energy density aqueous redox flow battery. United States. doi:10.1038/ncomms7303.
Li, Bin, Nie, Zimin, Vijayakumar, M., Li, Guosheng, Liu, Jun, Sprenkle, Vincent L., and Wang, Wei. Tue . "Ambipolar zinc-polyiodide electrolyte for a high-energy density aqueous redox flow battery". United States. doi:10.1038/ncomms7303. https://www.osti.gov/servlets/purl/1184933.
@article{osti_1184933,
title = {Ambipolar zinc-polyiodide electrolyte for a high-energy density aqueous redox flow battery},
author = {Li, Bin and Nie, Zimin and Vijayakumar, M. and Li, Guosheng and Liu, Jun and Sprenkle, Vincent L. and Wang, Wei},
abstractNote = {Large-scale energy storage systems are crucial for substantial deployment of renewable energy sources. Energy storage systems with high energy density, high safety, and low cost and environmental friendliness are desired. To overcome the major limitations of the current aqueous redox flow battery systems, namely lower energy density (~25 Wh L-1) and presence of strong acids and/or other hazardous, a high energy density aqueous zinc/polyiodide flow battery (ZIB) is designed with near neutral ZnI2 solutions as catholytes. The energy density of ZIB could reach 322 Wh L-1 at the solubility limit of ZnI2 in water (~7 M). We demonstrate charge and discharge energy densities of 245.9 Wh/L and 166.7 Wh L-1 with ZnI2 electrolyte at 5.0 M, respectively. The addition of ethanol (EtOH) in ZnI2 electrolyte can effectively mitigate the growth of zinc dendrite at the anode and improve the stability of catholytes with wider temperature window (-20 to 50°C), which enable ZIB system to be a promising alternative as a high-energy and high- safety stationary energy storage system.},
doi = {10.1038/ncomms7303},
journal = {Nature Communications},
number = ,
volume = 6,
place = {United States},
year = {Tue Feb 24 00:00:00 EST 2015},
month = {Tue Feb 24 00:00:00 EST 2015}
}

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