基于埃洛石的硅纳米管制备及储锂性能  

Preparation and Lithium Storage Properties of Silicon Nanotubes Based on Halloysite

作　　者：赵明远 杨绍斌[2] 董伟[2] 赵玲敏 沈丁[2] ZHAO Mingyuan;YANG Shaobin;DONG Wei;ZHAO Lingmin;SHEN Ding(College of Mines,Liaoning Technical University,Fuxin 123000,Liaoning,China;College of Materials Science and Engineering,Liaoning Technical University,Fuxin 123000,Liaoning,China)

机构地区：[1]辽宁工程技术大学矿业学院,辽宁阜新123000 [2]辽宁工程技术大学材料科学与工程学院,辽宁阜新123000

出　　处：《硅酸盐学报》2021年第7期1457-1465,共9页Journal of The Chinese Ceramic Society

基　　金：国家自然科学基金(51774175、51874167、21808095)资助。

摘　　要：以天然埃洛石为前驱体,通过低温铝热还原法和自模板法合成硅纳米管,研究了结构形貌在还原过程中的维持机理及储锂性能。结果表明:在低温铝热还原过程中,天然埃洛石中的铝氧八面体有助于维持埃洛石一维纳米管状结构进而得到硅纳米管。基于埃洛石的硅纳米管作为锂离子电池负极时具有优异的电化学性能,电极首次比放电容量高达3 150.2 (mA·h)/g,50次循环后显示出1 786.0 (m A·h)/g的高容量,为商业硅材料比容量的2倍以上,采用2 A/g大电流密度循环时,电极在200次循环后比容量能够保持1 197.6 mA·h/g,远高于商业硅电极。Natural halloysite was used as precursor and template to prepare silicon nanotubes through low temperature aluminothermic reduction.The mechanism of variation in morphology during the reduction process and the lithium storage performance of the silicon nanotube were studied.It was found that the alumina octahedron in the natural halloysite was helpful to maintain the one-dimensional nanotube structure of the products during the low temperature aluminothermic reduction process,leading to the formation of silicon nanotubes.The silicon nanotubes had excellent electrochemical performance when used as anode of lithium-ion batteries,with an initial specific capacity of 3150 m A·h/g.After 50 cycles,the specific capacity was still 1977 m A·h/g,which is more than twice the value of commercial silicon anode.At a current density of 2 A/g,the capacity was maintained to be 913 m A·h/g after 200 cycles,which is also much higher than that of commercial silicon anode.

关 键 词：埃洛石 低温铝热还原 硅纳米管 锂离子电池 负极材料 

分 类 号：TM538[电气工程—电器]