摘要
利用Zn2SnO4纳米颗粒和葡萄糖为反应物,通过简单的水热法制备了碳包覆的Zn2SnO4纳米颗粒。利用X射线衍射(XRD)、扫描电镜(SEM)、透射电镜(TEM)、热重分析(TG)和拉曼光谱对样品的结构、形貌和性质进行了表征。XRD和SEM结果表明制备了立方尖晶石型Zn2SnO4纳米颗粒。TEM、TG和Raman结果表明制备了碳包覆的Zn2SnO4。电化学性能测试结果表明在200 mA/g的较大电流密度下,碳包覆Zn2SnO4纳米颗粒首次充放电容量分别为1429.2 mAh/g和737.7 mAh/g,库伦效率为51.6%。经过50次循环后放电容量保持374.8 mAh/g,表现出良好的循环性能,优于纯Zn2SnO4纳米颗粒。碳材料的引入抑制电极材料体积膨胀同时提高了其导电性能。
Carbon-modified Zn2SnO4nanoparticles were synthesized by a facile hydrothermal using asprepared Zn2SnO4and glucose as reactants.The structure,morphology and property of samples are characterized by X-ray diffraction（XRD）,scanning electron microscopy（SEM）,transmission electron microscopy（TEM）,thermogravimetric analyzer（TG） and Raman.XRD and SEM results show that samples as-obtained are cubic spinel structure nanoparticles.TEM,TG and Raman spectroscopy confirm synthesis of carbon-coated Zn2SnO4.Electrochemical measurement results show that the first discharge/charge capacity of carbon-coated Zn2SnO4are about 1429.2 mAh/g and 737.7 mAh/g at a current density of 200 mA/g,corresponding to Coulombic efficiency of 51.6 %.After 50 cycles,the discharge capacity retains 374.8 mAh/g and exhibits excellent cycling stability,which is much better than the bare Zn2SnO4.The introduction of carbon could buffer the volume expansion and improve conductivity of electrode materials.
出处
《人工晶体学报》
EI
CAS
CSCD
北大核心
2014年第6期1535-1539,共5页
Journal of Synthetic Crystals
基金
河南省自然科学基金项目(122300410214
132102210048)
南阳师范学院专项项目(ZX2011007)
