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Superior Sodium Storage of Carbon-Coated NaV₆O₁₅ Nanotube Cathode: Pseudocapacitance Versus Intercalation
- Song, Xuexia, Li, Jicheng, Li, Zhaohui, Xiao, Qizhen, Lei, Gangtie, Hu, Zhongliang, Ding, Yanhuai, Kheimeh Sari, Hirbod Maleki, Li, Xifei
- ACS applied materials & interfaces 2019 v.11 no.11 pp. 10631-10641
- batteries, cathodes, harvesting, nanotubes, sodium, vanadium
- 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.