银负载量对网状TiO2柔性薄膜电极储锂性能的影响
Effect of Loading Content of Silver on Lithium Storage for TiO2 Net-Work Flexible Film Electrode
作者单位E-mail
张英杰 昆明理工大学冶金与能源工程学院, 云南省先进电池及材料工程实验室, 昆明 650093  
刘嘉铭 昆明理工大学冶金与能源工程学院, 云南省先进电池及材料工程实验室, 昆明 650093  
赵金保 厦门大学化学化工学院, 固体表面物理化学国家重点实验室, 厦门 361005  
黄令 厦门大学化学化工学院, 固体表面物理化学国家重点实验室, 厦门 361005  
李雪 昆明理工大学冶金与能源工程学院, 云南省先进电池及材料工程实验室, 昆明 650093 4386160734@qq.com 
摘要: 采用水热法结合银镜反应制备出一系列不同Ag负载量(2.2%、4.0%、6.4%,w/w)改性的3D纳米网状结构Ag@TiO2薄膜电极。利用电感耦合等离子体技术(ICP)、X射线衍射(XRD)、扫描电镜(SEM)、透射电镜(TEM)和X射线能谱(EDX)等表征手段测试所合成材料的形貌及成分,实验结果表明Ag纳米颗粒可以成功沉积在TiO2纳米线表面。电化学测试数据则表明,4.0%(w/w)负载量的Ag@TiO2相比于未改性和其他负载量的TiO2纳米线具有更好的倍率性能和更稳定的可逆容量。在50,100,200,400,800和1 200 mA·g-1的电流密度条件下,该改性电极的放电容量可分别达到261.4,253.7,239.5,216.5,193.1和185.1 mAh·g-1,在200 mA·g-1下循环80次后容量保持率仍能达到99.8%。
关键词: 锂离子电池  柔性薄膜电极  钛基材料  银镜反应
基金项目: 国家自然科学基金(No.51604132)资助项目。
Abstract: A series of silver-modified TiO2 flexible film electrodes with hierarchical 3D nano-network structure are facilely synthesized using hydrothermal method followed via the traditional silver mirror reaction. Successful deposition of Ag nanoparticles on to the TiO2 nanowires surface is confirmed by inductively coupled plasma (ICP) technique, X-ray diffraction (XRD), scanning electron microscope (SEM) with energy-dispersive X-ray analysis (EDX) and transmission electron microscopy (TEM). The electrochemical properties of the Ag@TiO2 nanowires were researched in this work. Our results show that the Ag@TiO2 nanowires with 4.0%(w/w) silver exhibits a better rate performance and more excellent reversibility than pristine one. At different current densities of 50, 100, 200, 400, 800 and 1 200 mA·g-1, the discharge capacities of the Ag@TiO2 electrodes are 261.4, 253.7, 239.5, 216.5, 193.1 and 185.1 mAh·g-1, respectively. After 80 cycles at 200 mA·g-1, its discharge capacity retention is 99.8% indicating Ag@TiO2 electrodes are potentially useful for LIBs.
Keywords: lithium ion battery  flexible film electrodes  Ti-based materials  silver mirror reaction
投稿时间:2016-10-24 修订日期:2017-03-13
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张英杰,刘嘉铭,赵金保,黄令,李雪.银负载量对网状TiO2柔性薄膜电极储锂性能的影响[J].无机化学学报,2017,33(5):809-816.
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