Superior Sodium Storage of Carbon-Coated NaV 6 O 15 Nanotube Cathode: Pseudocapacitance Versus Intercalation

作者：Xuexia Song, Jicheng Li, Zhaohui Li, Qizhen Xiao, Gangtie Lei, Zhongliang Hu, Yanhuai Ding, Hirbod Maleki Kheimeh Sari, Xifei Li · 发表于：ACS Applied Materials & Interfaces · 年份：2019 · DOI：10.1021/acsami.8b20494 · 被引用次数：39 · 研究领域：Advancements in Battery Materials、Supercapacitor Materials and Fabrication、Advanced Battery Materials and Technologies

To realize the effect of Na + pseudocapacitance on the sodium storage of cathode materials, clewlike carbon-coated sodium vanadium bronze (NaV 6 O 15 ) 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 NaV 6 O 15 cathode material in sodium-ion batteries.