摘要
采用阳极氧化法制备三维有序TiO2纳米管阵列,在450、600、650及700℃煅烧2h,借助X射线衍射仪、扫描电子显微镜以及X射线能量色散光谱仪研究了煅烧温度对TiO2纳米管阵列微观结构及形貌的影响。以金属锂箔为对电极和参比电极,研究了不同热处理温度对TiO2纳米管阵列电极的充/放电性能、循环伏安曲线和循环稳定性的影响。结果表明:在450℃煅烧时,TiO2纳米管是锐钛矿型晶体,随着温度升高,金红石相开始出现并逐渐转变成为主要晶相;650℃是TiO2纳米管形貌开始坍塌的临界温度,在700℃时,纳米管形貌完全坍塌;作为锂离子电池负极活性材料,虽然放电比容量随着煅烧温度的增加而降低,但均表现出良好的充/放电稳定性。
Three dimensional ordered TiO2 nanotube arrays were prepared by anodization and calcined at 450,600,650 and 700 ℃for 2 h,respectively.The effect of calcination temperature on the micro-structure and morphology of as-prepared TiO2 nanotube arrays was studied in terms of X-ray diffraction,scanning electron microscopy and energy dispersive X-ray spectroscopy.Furthermore,the effect of calcination temperature on electrochemical performances of TiO2 nanotube arrays was investigated in terms of charge/discharge performance,cyclic voltammograms and cycle stability by using Li foil as the reference electrode and counter electrode.The results showed that anatase phase dominated at 450 ℃,and with the increase of the calcination temperature,the rutile phase increased gradually and became into the main phase at 700 ℃ finally; initial damage at 650 ℃ and collapse at 700 ℃ of nanotubes morphology can be observed.When TiO2 nanotube arrays were used as anode active materials of Li-ion battery,the discharge capacity gradually decreased with the increase of the calcination temperature.However,all TiO2 nanotube arrays exhibited satisfactory cycle stability.
出处
《硅酸盐学报》
EI
CAS
CSCD
北大核心
2015年第6期817-822,共6页
Journal of The Chinese Ceramic Society
基金
国家自然科学基金(51363011)
教育部第46批留学归国科研启动基金
云南省高层次引进人才工作经费资助项目(10978125)
云南省人才培养项目(14118425)
昆明理工大学重点学科建设项目(14078232)
昆明理工大学先进电池膜电极材料方向团队(14078311)资助
