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Porous ZrNb24O62 Nanowires with Pseudocapacitive Behavior Achieve High-Performance Lithium-Ion Storage

Abstract

The ever-increasing power and energy demands for modern consumer electronics and electric vehicles are driving the pursuit of energy-storage technologies beyond the current horizon. Pseudocapacitive charge storage is one of the most effective and promising approaches to fill in this technology gap, owing to its potential to deliver both high power and energy densities. Typically, titanium niobium oxides (TiNbxO2+2.5x (x = 2, 5 and 24)) with intrinsic pseudocapacitance, high safety and theoretical capacities of 388–402 mAh g–1 are recognized as promising anode materials for lithium-ion batteries. However, their poor conductivity and low Li+-ion diffusion coefficient are known to be the major hurdle in limiting the full utilization of their pseudocapacitive effects, leading to their lackluster rate capabilities. Herein, we employ a facile electrospinning method to prepare one-dimensional hierarchically porous ZrNb24O62 nanowires (P-ZrNb24O62) with an ultra-large Li+-ion diffusion coefficient as a new intercalating pesuocapacitive material for boosing Li+-ion storage. The P-ZrNb24O62 exhibits excellent electrochemical performances, including a high reversible capacity (320 mAh g–1 at 0.1 C), safe working potential (~1.67 V vs. Li/Li+), high initial Columbic efficiency (90.1%), outstanding rate capability (182 mAh g–1 at 30 C) and durable long-term cyclability (90.2% capacity retention over 1500 cycles).

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Publication details

The article was received on 20 Aug 2017, accepted on 20 Sep 2017 and first published on 25 Sep 2017


Article type: Paper
DOI: 10.1039/C7TA07347J
Citation: J. Mater. Chem. A, 2017, Accepted Manuscript
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    Porous ZrNb24O62 Nanowires with Pseudocapacitive Behavior Achieve High-Performance Lithium-Ion Storage

    C. Yang, Y. Zhang, F. Lv, C. Lin, Y. Liu, K. Wang, J. Feng, X. Wang, Y. Chen, J. Li and S. Guo, J. Mater. Chem. A, 2017, Accepted Manuscript , DOI: 10.1039/C7TA07347J

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