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Issue 29, 2018
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Concentrated electrolytes stabilize bismuth–potassium batteries

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Abstract

Storing as many as three K-ions per atom, bismuth is a promising anode material for rechargeable potassium-ion batteries that may replace lithium-ion batteries for large-scale electrical energy storage. However, Bi suffers from poor electrochemical cyclability in conventional electrolytes. Here, we demonstrate that a 5 molar (M) ether-based electrolyte, versus the typical 1 M electrolyte, can effectively passivate the bismuth surface due to elevated reduction resistance. This protection allows a bismuth–carbon anode to simultaneously achieve high specific capacity, electrochemical cyclability and Coulombic efficiency, as well as small potential hysteresis and improved rate capability. We show that at a high electrolyte concentration, the bismuth anode demonstrates excellent cyclability over 600 cycles with 85% capacity retention and an average Coulombic efficiency of 99.35% at 200 mA g−1. This “concentrated electrolyte” approach provides unexpected new insights to guide the development of long-cycle-life and high-safety potassium-ion batteries.

Graphical abstract: Concentrated electrolytes stabilize bismuth–potassium batteries

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Publication details

The article was received on 23 Apr 2018, accepted on 16 Jun 2018 and first published on 18 Jun 2018


Article type: Edge Article
DOI: 10.1039/C8SC01848K
Citation: Chem. Sci., 2018,9, 6193-6198
  • Open access: Creative Commons BY-NC license
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    Concentrated electrolytes stabilize bismuth–potassium batteries

    R. Zhang, J. Bao, Y. Wang and C. Sun, Chem. Sci., 2018, 9, 6193
    DOI: 10.1039/C8SC01848K

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