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首页> 外文期刊>International Journal of Electrochemical Science >Poly Vinyl Alcohol- Based Sol- Gel Synthesis of V2O5 Nanoflakes as Positive Electrodes of Li- ion Batteries
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Poly Vinyl Alcohol- Based Sol- Gel Synthesis of V2O5 Nanoflakes as Positive Electrodes of Li- ion Batteries

机译：基于聚乙烯醇的溶胶凝胶法合成V 2 O 5 纳米薄片作为锂离子电池的正极

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This work shows a new method to synthesize V2O5 nanostructures by poly vinyl alcohol- based sol-gelmethod. The precursor NH4VO3 and polyvinyl alcohol is dissolved in a binary (ethanol/water) solventto obtain a sol solution and heated until to obtain a homogeneous polymeric gel. During gel pyrrolysisin an electrical furnace, vanadium salt is calcined to V2O5. The prepared samples are investigated bySEM, TEM, XRD and TGA-DTA. By this method, uniform V2O5 nanoflakes with 37 nm averagethickness can be synthesized. Electrochemical behaviors of V2O5 samples are also investigated in a0.1M LiClO4 electrolyte solution prepared in the 1:1 (V/V) ethylene carbonate and dimethyl carbonatesolvents by cyclic voltammetry. Finally, some selected V2O5 nanomaterials are used as positiveelectrode materials of Li- ion batteries. The obtained results shows the morphologies and the particlessizes of the cathodic materials can significantly change the redox kinetic rates and charge/dischargeperformance of the batteries. The Battery made with V2O5 nanoflakes shows the highest discharge-1 -1 -1 capacity of 430 mAh g and 280 mAh g for cycles of 1 and 100 at a current density of 100 mA g ,respectively.
机译：这项工作显示了一种新的通过聚乙烯醇基溶胶-凝胶法合成V2O5纳米结构的方法。将前体NH4VO3和聚乙烯醇溶解在二元（乙醇/水）溶剂中，以获得溶胶溶液，并加热直至获得均质的聚合物凝胶。在电炉中进行凝胶热解过程中，钒盐被煅烧成V2O5。通过SEM，TEM，XRD和TGA-DTA对制备的样品进行了研究。通过这种方法，可以合成平均厚度为37 nm的均匀V2O5纳米薄片。还通过循环伏安法在0.1（V / V）碳酸亚乙酯和碳酸二甲酯溶剂中制备的0.1M LiClO4电解质溶液中研究了V2O5样品的电化学行为。最后，一些选定的V2O5纳米材料被用作锂离子电池的正极材料。所得结果表明，阴极材料的形貌和粒径可以显着改变电池的氧化还原动力学速率和充电/放电性能。用V2O5纳米薄片制成的电池在100 mA g的电流密度下分别在1和100次循环中显示出最高的放电-1 -1 -1容量，分别为430 mAh g和280 mAh g。

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