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Potassium-rich iron hexacyanoferrate/dipotassium terephthalate@carbon nanotube composite for K-ion full cells with optimized electrolyte

Abstract

K-ion batteries as an emerging battery system generates more and more attention in the research community. Herein, we report a K-ion full cell based on nano-sized K1.92Fe[Fe(CN)6]0.94•0.5H2O cathode, dipotassium terephthalate (K2TP)@carbon nanotube (CNT) anode and optimized electrolyte. K1.92Fe[Fe(CN)6]0.94•0.5H2O delivers a high capacity of 133 mAh g-1 with 92.8% capacity retention after 200 cycles and high coulombic efficiency of 98.5%. The side reactions of K metal with electrolyte are suppressed in KClO4/propylene carbonate (PC). The K2TP nanosheets in-situ grown at CNT shows a high reversible capacity of about 250 mAh g-1 and ultrahigh rate capability. The full cells based on them are well cycled in a DME-based electrolyte, showing great promise for large-scale energy storage.

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Publication details

The article was received on 23 Jun 2017, accepted on 10 Aug 2017 and first published on 10 Aug 2017


Article type: Paper
DOI: 10.1039/C7TA05460B
Citation: J. Mater. Chem. A, 2017, Accepted Manuscript
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    Potassium-rich iron hexacyanoferrate/dipotassium terephthalate@carbon nanotube composite for K-ion full cells with optimized electrolyte

    J. Liao, Q. Hu, Y. Yu, H. Wang, Z. Tang, Z. Wen and C. Chen, J. Mater. Chem. A, 2017, Accepted Manuscript , DOI: 10.1039/C7TA05460B

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