锂离子电池SiO_x/C/CNTs复合负极材料的制备及其电化学性能  

Preparation and Electrochemical Performance of SiO_x/C/CNTs Composite Anode for Lithium Ion Batteries

作　　者：李文超[1,2] 唐仁衡 王英 王华昆 肖方明[2] 黄玲 LI Wenchao;TANG Renheng;WANG Ying;WANG Huakun;XIAO Fangming;HUANG Ling(School of Materials Science and Engineering,Kunming University of Science and Technology,Kunming 650093;Guangdong Province Key Laboratory of Rare Earth Development and Application,Guangdong Research Institute of Rare Metals,Guangzhou 510650)

机构地区：[1]昆明理工大学材料科学与工程学院,昆明650093 [2]广东省稀有金属研究所广东省稀土开发及应用重点实验室,广州510650

出　　处：《材料导报》2018年第17期2920-2924,共5页Materials Reports

基　　金：广东省自然科学基金(2014A030308015);广东省省级科技计划项目(2015B010116002)

摘　　要：通过机械球磨、喷雾干燥和高温热解制备锂离子电池SiO_x/C/CNTs复合负极材料,采用X射线衍射仪(XRD)、扫描电子显微镜(SEM)、透射电子显微镜(TEM)、X射线能谱仪(EDS)和恒流充放电测试仪,对其物相组成、颗粒形貌及电化学性能进行了表征,并与SiO_x/C和SiO_x/C/石墨烯复合材料的性能对比。研究结果表明,CNTs的引入不仅可以增加复合材料的可逆容量,还可以有效提高材料的循环稳定性。SiO_x/C/CNTs复合负极材料在100mA/g下首次放电比容量为1 981.5mAh/g,循环100周后,放电容量仍有474.0mAh/g,倍率性能较优,具有良好的应用前景。ASiOx/C/CNTs composite anode for lithium ion batteries has been prepared via mechanical milling,spray drying and pyrolysis.The phase composition,morphology and electrochemical performance of the composites were detected by X-ray diffractometer(XRD),scanning electron microscope(SEM),transmission electron microscope(TEM),energy disperse spectroscopy(EDS)and constant current charge-discharge test,and comparing the performance with SiO x/C and SiO x/C/graphene composition materials.The test results revealed that the introduction of CNTs can not only increase the reversible specific capacity of composites,but also improved its cyclic stability efficiently.The initial discharge capacity of SiO x/C/CNTs composition anode materials is 1 981.5 mAh/g at the current density of 100 mA/g,the discharge capacity remains at 474.0 mAh/g after 100 cycles,with excellent rate performance and good application prospect.

关 键 词：锂离子电池 SiOx/C/CNTs复合负极材料 喷雾干燥 高温热解 循环性能 

分 类 号：TM912.9[电气工程—电力电子与电力传动]