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Porous carbon-coated NaTi2(PO4)3 with superior rate and low-temperature properties

Abstract

Nanosized porous carbon-coated NaTi2(PO4)3 (NTP) particles with superior rate and low-temperature properties are synthesized by a hydrothermal process combined with different carbon coating steps. Their structures and electrochemical performances are analyzed by X-ray diffraction, scanning/transmission electron microscopies, Raman spectroscopy, N2 adsorption/desorption measurement and galvanostatic cell cycling. The the optimized carbon-coated NTP sample NTP@C-2 shows superb rate performance with a charge capacity of 110.9 mAh g-1 at 30C rate, i.e. 97.0% retention of its capacity at 0.5C. After 1000 cycles at 10C, the reversible capacity can still reach 105.6 mAh g-1 with a very slow capacity decay of 0.0022% per cycle. Even at -20°C, NTP@C-2 can still deliver a capacity of 97.6 mAh g-1 at 10C and 61.1 mAh g-1 at 20C. These excellent electrochemical performances can be attributed to both the nanosized porous architecture and the highly graphitic carbon coating. The use of a small amount of Na3V2(PO4)3 intermediate powder accounts for the formation of more sp2-type carbon coating. Such an NTP powder provides a promising anode material for high power sodium-ion batteries.

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Publication details

The article was received on 20 Nov 2017, accepted on 03 Jan 2018 and first published on 04 Jan 2018


Article type: Paper
DOI: 10.1039/C7TA10207K
Citation: J. Mater. Chem. A, 2018, Accepted Manuscript
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    Porous carbon-coated NaTi2(PO4)3 with superior rate and low-temperature properties

    Q. Hu, M. Yu, J. Liao, Z. Wen and C. Chen, J. Mater. Chem. A, 2018, Accepted Manuscript , DOI: 10.1039/C7TA10207K

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