Journal
NANO LETTERS
Volume 11, Issue 12, Pages 5421-5425Publisher
AMER CHEMICAL SOC
DOI: 10.1021/nl203193q
Keywords
Energy storage; nickel hexacyanoferrate; Prussian Blue analogue; sodium ion battery; potassium ion battery; aqueous battery
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Funding
- King Abdullah University of Science and Technology (KAUST) [KUSl1-001-12]
- Department of Energy, Office of Basic Energy Sciences, Division of Materials Sciences and Engineering through SLAG National Accelerator Laboratory LDRD [DE-AC02-76SF00515]
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The electrical power grid faces a growing need for large-scale energy storage over a wide range of time scales due to costly short-term transients, frequency regulation, and load balancing. The durability, high power, energy efficiency, and low cost needed for grid-scale storage pose substantial challenges for conventional battery technology.(1,2) Here, we demonstrate insertion/extraction of sodium and potassium ions in a low-strain nickel hexacyanoferrate electrode material for at least five thousand deep cycles at high current densities in inexpensive aqueous electrolytes. Its open-framework structure allows retention of 6696 of the initial capacity even at a very high (41.7C) rate. At low current densities, its round trip energy efficiency reaches 99%. This low-cost material is readily synthesized in bulk quantities. The long cycle life, high power, good energy efficiency, safety, and inexpensive production method make nickel hexacyanoferrate an attractive candidate for use in large-scale batteries to support the electrical grid.
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