American Chemical Society
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Superior Sodium Storage of Carbon-Coated NaV6O15 Nanotube Cathode: Pseudocapacitance Versus Intercalation

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journal contribution
posted on 2019-02-25, 00:00 authored by Xuexia Song, Jicheng Li, Zhaohui Li, Qizhen Xiao, Gangtie Lei, Zhongliang Hu, Yanhuai Ding, Hirbod Maleki Kheimeh Sari, Xifei Li
To realize the effect of Na+ pseudocapacitance on the sodium storage of cathode materials, clewlike carbon-coated sodium vanadium bronze (NaV6O15) nanotubes (Na-VBNT@C) were synthesized via a facile combined sol–gel/hydrothermal method. The resultant Na-VBNT@C delivers high reversible capacities of 209 and 105 mA h g–1 at the rates of 0.1 and 10 C, respectively. Notably, at the higher rate of 5 C (1250 mA g–1), it can retain 94% of the initial capacity after 3000 cycles. It was found that the outstanding rate performance and the long-term cycling life of Na-VBNT@C are primarily due to the Na+ pseudocapacitance. Our study reveals that the design of Na+ pseudocapacitance is beneficial for harvesting the superior performance of NaV6O15 cathode material in sodium-ion batteries.