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Superior Sodium Storage Performance of Additive-Free V2O5 Thin Film Electrode.  
Superior Sodium Storage Performance of Additive-Free V2O5 Thin Film Electrode.
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关键词: V2O5  
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简介:
A binder- and conductive-agent-free V2O5 thin film electrode was fabricated by a facile and cost-efficient cathodic deposition method directly on stainless steel substrates followed by annealing at 300 C in air for 1 h. The V2O5 film is approximately 1 mm in thickness and consists of layer-by-layer stacked nanosheets. When used as a cathode for sodium ion batteries, the V2O5 thin film electrode exhibits a high reversible discharge capacity (174 mA h g1 at 200 mA g1), excellent cycling stability (almost 100% capacity retention over 200 cycles at 1 A g1), and outstanding rate capability (retaining a capacity of 124 mA h g1 at 5 A g1). Cyclic voltammetric analyses reveal that pseudocapacity-dominated charge storage of sodium ions accounts for the superior performance.
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