Correlation between porous structure and electrochemical properties of porous nanostructured vanadium pentoxide synthesized by novel spray pyrolysis
Correlation between porous structure and electrochemical properties of porous nanostructured vanadium pentoxide synthesized by novel spray pyrolysis
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DOI：
10.1016/j.jpowsour.2016.02.023
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发表时间：
2016-04
影响因子：
9.2
通讯作者：
Long Kong;I. Taniguchi
中科院分区：
文献类型：
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作者：
Long Kong;I. Taniguchi
以硝酸铵（NH 4 NO3）为添加剂，采用喷雾热分解（SP）法制备了多孔纳米五氧化二钒（V2 O 5）颗粒。研究了V2 O 5颗粒的多孔结构与电化学性能之间的相关性。当前体溶液中NH 4 NO3的浓度从0增加到0.408 mol L-1时，多孔结构显著改变。基于N2吸附-脱附等温线测量的孔结构分析表明，采用新型SP法可以制备出孔径小于100 nm的多孔纳米V2 O 5颗粒，并且前驱体溶液中NH 4 NO3浓度的增加可以增大V2 O 5颗粒中的孔，尤其是那些尺寸在20 ~ 80 nm之间的颗粒。用0.272 mol L-1的NH 4 NO3浓度制备的多孔纳米结构V2 O 5在20 mA g-1下表现出400 mAh g-1的首次放电容量。V2 O 5颗粒独特的多孔结构显著提高了倍率性能，在1200 mA g−1下首次放电容量为180 mAh g − 1，远高于致密V2 O 5颗粒的首次放电容量（70 mAh g−1）。
Porous nanostructured vanadium pentoxide (V2O5) particles were successfully prepared by spray pyrolysis (SP) in a precursor solution with an ammonium nitrate (NH4NO3) additive. The correlation between the porous structure and the electrochemical properties of the V2O5particles was investigated. The porous structure markedly changed upon increasing the concentration of NH4NO3in the precursor solution from 0 to 0.408 mol L−1. Pore structure analysis based on N2adsorption-desorption isotherm measurements indicated that porous nanostructured V2O5particles with a pore size of less than 100 nm can be prepared by the novel SP method and that an increase in the NH4NO3concentration in the precursor solution can enlarge the pores in the V2O5particles, especially those with a size between 20 and 80 nm. The porous nanostructured V2O5prepared with an NH4NO3concentration of 0.272 mol L−1exhibited a first discharge capacity of 400 mAh g−1at 20 mA g−1. The unique porous structure of V2O5particles significantly enhanced the rate performance and exhibited a first discharge capacity of 180 mAh g−1at 1200 mA g−1, which is much higher than that of dense V2O5particles (70 mAh g−1).