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Issue 9, 2019
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Highly reversible potassium-ion intercalation in tungsten disulfide

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Abstract

Rechargeable potassium-ion batteries (PIBs) show promise beyond Li-ion technology in large-scale electrical-energy storage due to the abundance and low cost of potassium resources. However, the intercalation of large-size K+ generally results in irreversible structural degradation and short lifespan to the hosts, representing a major obstacle. Here, we report a new electrochemical K+-intercalation host, tungsten disulfide (WS2), which can store 0.62 K+ per formula unit with a reversible capacity of 67 mA h gāˆ’1 and well-defined voltage plateaus at an intrinsically safe average operation potential of 0.72 V versus K/K+. In situ X-ray diffraction and ex situ electron microscopy revealed the underlying intercalation mechanism, a relatively small cell volume change (37.81%), and high reversibility of this new battery chemistry. Such characteristics impart WS2 with ultrahigh structural stability and a long lifespan, regardless of deep or fast charging. WS2 achieved record-high cyclability among chalcogenides up to 600 cycles with 89.2% capacity retention at 0.3C, and over 1000 cycles with 96.3% capacity retention and an extraordinary average Coulombic efficiency of 99.90% at 2.2C. This intercalation electrochemistry may open up new opportunities for the design of long-cycle-life and high-safety PIBs.

Graphical abstract: Highly reversible potassium-ion intercalation in tungsten disulfide

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Publication details

The article was received on 30 Sep 2018, accepted on 24 Dec 2018 and first published on 27 Dec 2018


Article type: Edge Article
DOI: 10.1039/C8SC04350G
Citation: Chem. Sci., 2019,10, 2604-2612
  • Open access: Creative Commons BY-NC license
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    Highly reversible potassium-ion intercalation in tungsten disulfide

    R. Zhang, J. Bao, Y. Pan and C. Sun, Chem. Sci., 2019, 10, 2604
    DOI: 10.1039/C8SC04350G

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