TiO_2纳米材料在锂硫电池正极中的应用  

Application of TiO_2 nanomaterials in cathode material of lithium-sulfur batteries

作　　者：秦文东[1] 黄美红[1] 梁兴华[1] QIN Wen-dong;HUANG Mei-hong;LIANG Xing-hua(Guangxi University of Science and Technology,Liuzhou Guangxi 545006,China)

机构地区：[1]广西科技大学,广西柳州545006

出　　处：《电源技术》2018年第7期1003-1005,共3页Chinese Journal of Power Sources

基　　金：广西科技大学2015年广西汽车零部件与整车技术重点实验室自主研究课题(15-A-03-01)

摘　　要：实验采用的TiO_2纳米材料是通过水热合成法制备并进行碳化得到。将所得的TiO_2纳米材料作为硫载体,用熔融吸附法缓慢将硫单质融入载体中,最后得到C/S/TiO_2复合正极材料。材料的结构表征主要采用扫描电镜(SEM)和X射线衍射仪(XRD),结果表明,TiO_2基体由大小在40~60 nm范围内的颗粒聚集成薄片,薄片为微米级。实验采用335m A/g的电流密度对组装的扣式电池进行电化学性能测试。结果表明,C/S/TiO_2复合材料的首次放电比容量可达到1 512 m Ah/g,经过100次循环后放电比容量为710 m Ah/g;当采用0.5 C放电时,电池的放电比容量为869 m Ah/g,随着充放电倍率由0.8 C增加到2 C,电池的可逆比容量依次为794、722、668 m Ah/g,表明通过加入TiO_2,在大的充放电密度下电池的循环稳定性得到了很大的提高。The TiO2 nanomaterials were prepared by hydrothermal synthesis and carbonized method.With TiO2 nanomaterials as the sulfur carrier,sulfur monomer was slowly incorporated into the carrier by the melt adsorption method,and C/S/TiO2 composite cathode material was obtained.The structure of the material was characterized by scanning electron microscope(SEM)and X ray diffractometer(XRD).The results show that TiO2 matrix is the micron scale lamellae composed of particles within the range of 40-60 nm.The button cell was tested under the current density of 335 mA/g.The electrochemical performance test results show that the first discharge specific capacity of C/S/TiO2 composite material can reach 1 512 mAh/g,and after 100 cycles,the discharge specific capacity is 710 mAh/g;when discharged at 0.5 C,the discharge specific capacity is 869 mAh/g;with the increase of charge and discharge rate from 0.8 C to 2 C,the reversible specific capacity are 794,722,668 mAh/g,respectively.From the results,it is concluded that the adding of TiO2 nanomaterial can greatly increase the cycling stability of button cell under large current density.

关 键 词：锂硫电池 电化学性能 TIO2纳米材料 硫正极 

分 类 号：TM912[电气工程—电力电子与电力传动]