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Ultrathin Na1.1V3O7.9 Nanobelts with Superior Performance as Cathode Materials for Lithium-Ion Batteries

Liang, Shuquan, Zhou, Jiang, Fang, Guozhao, Liu, Jing, Tang, Yan, Li, Xilin, Pan, Anqiang
ACS Applied Materials & Interfaces 2013 v.5 no.17 pp. 8704-8709
X-ray diffraction, cathodes, crystal structure, electrochemistry, lithium batteries, temperature, transmission electron microscopy
The Na₁.₁V₃O₇.₉ nanobelts have been synthesized by a facile and scalable hydrothermal reaction with subsequent calcinations. The morphologies and the crystallinity of the nanobelts are largely determined by the calcination temperatures. Ultrathin nanobelts with a thickness around 20 nm can be obtained, and the TEM reveals that the nanobelts are composed of many stacked thinner belts. When evaluated as a cathode material for lithium batteries, the Na₁.₁V₃O₇.₉ nanobelts exhibit high specific capacity, good rate capability, and superior long-term cyclic stability. A high specific capacity of 204 mA h g–¹ can be delivered at the current density of 100 mA g–¹. It shows excellent capacity retention of 95% after 200 cycles at the current density of 1500 mA g–¹. As demonstrated by the ex situ XRD results, the Na₁.₁V₃O₇.₉ nanobelts have very good structural stability upon cycling. The superior electrochemical performances can be attributed to the ultra-thin nanobelts and the good structural stability of the Na₁.₁V₃O₇.₉ nanobelts.