【作者】 武卫忠； 逄淑平； 李桂村； 张志焜； 陈克正；

【Author】 WU Wei-zhong,PANG Shu-ping,LI Gui-cun,ZHANG Zhi-kun,CHEN Ke-zheng (College of Materials Science and Engineering,QingdaoUniversity of Science and Technology, Qingdao 266042,China)

【机构】 青岛科技大学材料科学与工程学院；

【摘要】 在没有采用任何模板和表面活性剂的情况下,将过氧钒酸和乙酸铜混合水热制备出了Cu掺杂V₂O₅·xH₂O的纳米材料。通过改变反应试剂中Cu和V的摩尔比,来控制Cu掺杂V₂O₅·xH₂O的纳米材料的形貌。随着乙酸铜浓度的增加,纳米带最终变成了由大量放射状的纳米棒组成的针状纳米结构,这些纳米结构材料是一种重要的锂电池正极材料。电化学测试表明,Cu掺杂V₂O₅·xH₂O的纳米材料的比容量与所掺杂的Cu的量有关。当Cu和V的摩尔比为0.65时,放电电压在1.5～3.8V之间的初始放电比容量为290 mAhg^-1,经过20个循环后仍能达到150 mAhg^-1左右。更多还原

【Abstract】 Cu doped V₂O₅?xH₂O nanostructures have been synthesized by the reaction between peroxovanadic acid and copper acetic under hydrothermal conditions without the aid of any template and surfactant.The morphologies of Cu doped V₂O₅?xH₂O nanostructures can be adjusted by controlling the molar ratio of Cu and V in the reagents.As the concentration of copper acetic increases,nanobelts can be changed into urchin-like nanostructures composed of radially aligned nanorods,which can be an important candidate of cathode materials for lithium batteries.The electrochemical test shows that discharge specific capacity of Cu doped V₂O₅?xH₂O nanostructures is related to the Cu content.Cu doped V₂O₅?xH₂O nanostructures with Cu/V molar ratio of 0.65 exhibit an initial high discharge specific capacity of 290mAhg^-1 in the potential range of 1.5-3.8V and the capacity remains 150 mAhg^-1 after 20 cycles.更多还原