用溶胶凝胶法制备V2O5凝胶,调节凝胶的pH值和后续的冷冻干燥以及退火,制备出V2O5纳米材料.X射线衍射(XRD)和场发射扫描电镜(FESEM)的测试结果表明,该样品是一种具有大面积二维褶皱形貌的正交晶相V2O5纳米材料,每个纳米片又由大量的纳米小颗粒构成.使用循环伏安(CV)、交流阻抗(EIS)、电位驰豫(PRT)和充放电测试等手段表征了样品的储锂性能,结果表明,因具有独特的二维褶皱纳米结构,该纳米材料具有比已经商业化的V2O5更高的放电比容量、更好的大电流充放电性能、优异的电化学循环稳定性和更好的电化学反应动力学性能.
V2O5 gel was prepared by sol-gel method and V2O5 nanomaterial was fabricated by freezedrying the V2O5 gel with proper pH value and followed by annealing treatment.XRD and FESEM results revealed that the prepared V2O5 nanomaterial consists of a single orthorhombic phase small V2O5 nanoparticles with alarge are a two-dimensional fold-like morphology.The lithium storage performance of the prepared V2O5 nanomaterial was characterized by cyclic voltammetry(CV),electrochemical impedance spectroscopy(EIS),potential relaxation technique(PRT),and charge-discharge tests.Due to the unique two-dimensional fold-like nanostructure,the prepared V2O5 nanomaterial exhibits much higher specific discharge capacity,better high rate performance,excellent cycling stability,and enhanced electrochemical reaction kinetics rather than the commercial V2O5.Therefore,the two-dimensional fold-like V2O5 nanomaterial is a very promising cathode material for lithium-ion batteries.
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