硅藻土衍生硅碳负极材料的制备及其储锂性能研究  

Study on preparation of diatomite-derived silicon carbon anodematerial and its lithium storage performance

作　　者：张利锋[1] 王凯 王晓飞 刘毅[1] 郭守武[1,2] ZHANG Li-feng;WANG Kai;WANG Xiao-fei;LIU Yi;GUO Shou-wu(School of Material Science and Engineering,Shaanxi University of Science&Technology,Xi′an 710021,China;School of Electronic Information and Electrical Engineering,Shanghai Jiao Tong University,Shanghai 200240,China)

机构地区：[1]陕西科技大学材料科学与工程学院,陕西西安710021 [2]上海交通大学电子信息与电气工程学院,上海200240

出　　处：《陕西科技大学学报》2024年第5期119-125,共7页Journal of Shaanxi University of Science & Technology

基　　金：国家自然科学基金项目(21203116);陕西科技大学储能材料与器件平台建设项目(0126-126021802);陕西科技大学研究生创新基金项目。

摘　　要：本文以管状和盘状两种天然硅藻土作为初始原料,制备了一系列硅藻土衍生硅碳负极材料,并采用X射线衍射仪(XRD)、拉曼光谱(Raman)、扫描电子显微镜(SEM)、透射电子显微镜(TEM)、X-射线光电子能谱(XPS)等测试手段系统表征了所制备样品的晶体结构、微观形貌及化学组成.将制备的硅藻土衍生硅碳负极材料作为活性物质组装为锂离子电池,对比了管状和盘状两种形貌对其储锂性能的影响,并详细考察了沥青衍生碳包覆层的加入量对硅碳负极材料比容量及循环稳定性的影响.测试结果表明,样品管DE-1∶3和管DE-1∶6在0.2 A g^(-1)较低电流密度下均具有较好的容量保持率,循环500次之后比容量分别可保持443 mAh g^(-1)和414 mAh g^(-1),而样品管DE-1∶6则在0.5 A g^(-1)较大电流密度下具有更好的结构稳定性.Two types of tubular and disc-shaped natural diatomite were used as the initial raw materials to prepare a series of diatomite derived silicon carbon anode materials.The crystal structure,microstructure,and chemical composition of the prepared products were systematically characterized using testing methods such as X-ray diffraction(XRD),Raman spectroscopy(Raman),scanning electron microscope(SEM),transmission electron microscope(TEM),and X-ray photoelectron spectroscopy(XPS),etc.The prepared diatomite derived silicon carbon anode materials were assembled as active substances to assemble lithium ion batteries.The effects of tubular and disc-shaped morphologies on its lithium storage performance were compared,and the effect of the amount of asphalt derived carbon coating on the specific capacity and cycling stability of the silicon carbon anode materials was investigated in detail.The test results show that both products tube DE-1∶3 and tube DE-1∶6 have high capacity retention at a low current density of 0.2 A g^(-1),after 500 cycles,the specific capacity can be maintained at 443 mAh g^(-1)and 414 mAh g^(-1),respectively.While product tube DE-1∶6 has better structure stability at a higher current density of 0.5 A g^(-1).

关 键 词：锂离子电池 硅碳负极材料 硅藻土 比容量 

分 类 号：TS03[轻工技术与工程]