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Authors
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Lukatskaya, M.R. ; Feldblyum, J.I. ; Mackanic, D.G. ; Lissel, F. ; Michels, D. L. ; Cui, Y. ; Bao, Z.
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Title
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Concentrated mixed cation acetate "water-in-salt" solutions as green and low-cost high voltage electrolytes for aqueous batteries
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Date
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01.10.2018
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Number
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56018
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Abstract
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Electrolyte solutions are a key component of energy storage devices that significantly impact capacity, safety, and cost. Recent developments in “water-in-salt” (WIS) aqueous electrolyte research have enabled the demonstration of aqueous Li-ion batteries that operate with capacities and cyclabilities comparable with those of commercial non-aqueous Li-ion batteries. Critically, the use of aqueous electrolyte mitigates safety risks associated with non-aqueous electrolytes. However, the high cost and potential toxicity of imide-based WIS electrolytes limit their practical deployment. In this report, we disclose the efficacy of inexpensive, non-toxic mixed cation electrolyte systems for Li-ion batteries that otherwise provide the same benefits as current WIS electrolytes: extended electrochemical stability window and compatibility with traditional intercalation Li-ion battery electrode materials. We take advantage of the high solubility of potassium acetate to achieve the WIS condition in a eutectic mixture of lithium and potassium acetate with water-to-cation ratio as low as 1.3. Our work suggests an important direction for the practical realization of safe, low-cost, and high-performance aqueous Li-ion batteries.
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Publisher
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Energy & Environmental Science
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Wikidata
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Citation
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Energy & Environmental Science 11 (2018) 2876-2883
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DOI
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https://doi.org/10.1039/C8EE00833G
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