K3V2(PO4)2F3 as a robust cathode for potassium-ion batteries

By Xiuyi Lin, Jiaqiang Huang, H. Tan, Jian‐Qiu Huang, Biao Zhang. Energy Storage Materials, 2019

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Abstract Potassium-ion batteries have emerged as promising candidates for low-cost and sustainable energy storage systems. The development of potassium-ion batteries is relatively slow due to the large size of potassium ions, rendering great difficulty in designing appropriate host materials. Herein, a K3V2(PO4)2F3 cathode is inherited from Na3V2(PO4)2F3 analog. The crystallographic structure and phase transformations are unveiled through in-situ X-ray diffraction, which shows only minor volume change of 6.2% during potassium ions insertion/extraction. Nearly two potassium ions could be provided by the electrode, delivering a capacity of over 100 mA h g−1 with a high average potential of ~3.7 V vs. K+/K. An energy density of around 400 W h kg−1 together with a respectable rate capability have been obtained. Coupling with a graphite anode, a 3.4 V-Class battery has been demonstrated, making potassium-ion batteries promising contenders to sodium ion batteries in large-scale energy storage. This discovery also sheds insights into the quest for potential electrodes from the analogs in Li/Na-ion batteries.

Subfields: Automotive Engineering, Electrical and Electronic Engineering

View Paper: https://www.semanticscholar.org/paper/45f211a043286e6636a25746112097d5eb62bf99

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In Automotive Engineering

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In Electrical and Electronic Engineering

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  2. Wenchao Zhang
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