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K2Nb8O21 Nanotubes with Superior Electrochemical Performance towards Ultrastable Lithium Storage

Abstract

High-performance lithium-ion batteries are the milestone for developing sustainable energy community. However, it suffers from shortage of advanced energy storage materials. K2Nb8O21 is a novel lithium storage material, which has not been systematically investigated so far. In this work, K2Nb8O21 nanotubes and microtubes are facilely prepared using electrospinning technique under different conditions. As anode host, K2Nb8O21 nanotubes show better long-term cycling property, superior rate performance, and higher structural stability compared with microtubes. The electrochemical results exhibit that the K2Nb8O21 nanotubes deliver a considerable lithium storage capacity of 213 mAh g-1 after 5000 cycles at 1000 mA g-1 with outstanding capacity retention of 80.3%. The nano/micro structured host would fasten the transportation of lithium ions, thus rendering the high-rate capability and excellent cycling stability. Checking by in-situ XRD, ex-situ XPS and ex-situ TEM, K2Nb8O21 nanotubes show high structural stability and reversibility as a lithium storage anode material. All of these advantages suggest that K2Nb8O21 nanotubes may be a promising anode material for lithium-ion batteries.

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Publication details

The article was received on 09 Feb 2018, accepted on 11 Apr 2018 and first published on 13 Apr 2018


Article type: Paper
DOI: 10.1039/C8TA01411F
Citation: J. Mater. Chem. A, 2018, Accepted Manuscript
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    K2Nb8O21 Nanotubes with Superior Electrochemical Performance towards Ultrastable Lithium Storage

    X. Cheng, H. Zhu, H. Yu, W. Ye, R. Zheng, T. Liu, N. Peng, M. Shui and J. Shu, J. Mater. Chem. A, 2018, Accepted Manuscript , DOI: 10.1039/C8TA01411F

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