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Ion-selective Copper Hexacyanoferrate with Open-framework Structure Enables High-voltage Aqueous Mixed-ion Batteries

Abstract

Non-flammable and low-cost aqueous batteries operating on “M+/N+-dual shuttles” (AMIB) offer great opportunities in large-scale utility grid applications. Here, for the first time, we demonstrate a series of high-voltage AMIB (> 1.23 V) based on open-framework copper hexacyanoferrates (CuHCF) as cathode materials, and TiP2O7 & NaTi2(PO4)3 as anode materials, respectively. Among them, CuHCF/NaTi2(PO4)3 possesses high power density as an ultra-capacitor (3006 W kg-1), but with a higher energy density (56 Wh kg-1). Through multiple characterization techniques combined with ab initio calculations, the intercalation chemistry of alkali cations in CuHCF is revealed. With increasing ionic size, the most stable interstitial site changes from face-centered site (24d) to body-centered site (8c). The intercalation voltage for the alkali cation follows the order: K+ > Na+ > Li+. Meanwhile, the ion-selectivity among them follows the same order as the intercalation voltage, which accounts for the higher voltage outputs of AMIB in contrast to aqueous batteries operating on one shuttle.

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Publication details

The article was received on 14 May 2017, accepted on 12 Jul 2017 and first published on 12 Jul 2017


Article type: Paper
DOI: 10.1039/C7TA04172A
Citation: J. Mater. Chem. A, 2017, Accepted Manuscript
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    Ion-selective Copper Hexacyanoferrate with Open-framework Structure Enables High-voltage Aqueous Mixed-ion Batteries

    Z. Liu, L. Chen, P. Jiang, H. Shao and J. Feng, J. Mater. Chem. A, 2017, Accepted Manuscript , DOI: 10.1039/C7TA04172A

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