CaCl2-NaCl熔盐对电解SiO2制备Si纳米线的影响  

Influence of CaCl2-NaCl Molten Salt on Preparation of Silicon Nanowire via Electrolysis of SiO2

作　　者：周忠仁[1,2] 张英杰 华一新[1] 董鹏 汝娟坚[1] 段建国[1,2] ZHOU Zhong-ren;ZHANG Ying-jie;HUA Yi-xin;DONG Peng;RU Juan-jian;DUAN Jian-guo(Faculty of Metallurgical and Energy Engineering,Kunming University of Science and Technology,Kunming 650093,China;National and Local Joint Engineering Laboratory for Lithium-ion Batteries and Materials Preparation Technology,Kunming 650093,China)

机构地区：[1]昆明理工大学冶金与能源工程学院,昆明650093 [2]锂离子电池及材料国家地方联合工程实验室,昆明650093

出　　处：《有色金属（冶炼部分）》2019年第11期70-74,共5页Nonferrous Metals（Extractive Metallurgy)

基　　金：国家自然科学基金资助项目（51804148,51764029）;云南省应用基础研究计划项目（2018FD038）

摘　　要：采用熔盐电解法,以SiO2粉末为阴极原料、等摩尔比的CaCl2-NaCl混合熔盐为电解质、石墨棒为电解阳极,在700℃、1.8V槽电压下,经过5h电解后,制备得到数微米长、200nm宽的硅纳米线。讨论了电解质对阴极原料SiO2的影响。在700℃的熔盐中浸泡2h后,原料物相并未改变,而微观形貌由最初的类球形颗粒转变成彼此相连的网状或泡沫状多孔体。SiO2在电解过程中生成中间产物CaSiO3,CaSiO3进一步电解后,生成成了单质硅。Nanosized silicon with several micrometers in length and 200nm in width was synthesized by molten salt electrolysis method at 700℃ under cell voltage of 1.8V for 5happlying SiO2 powder as cathode raw material,equimolar CaCl2-NaCl mixed molten salt as electrolyte and graphite rod as anode.Effect of molten salt on cathode raw SiO2 was investigated.After rinsed in molten salt for 2h at 700℃,raw material SiO2 is characterized by XRD and SEM.The results suggest that phase of raw material is unchanged but morphology has been converted from initial spheroidal particles to inter-linked network and porous structure.During electrolysis of SiO2,intermediate CaSiO3 is produced,which is further electrolyzed for final formation of metallic silicon.

关 键 词：硅纳米线 SIO2 熔盐电解质 

分 类 号：TF111.522[冶金工程—冶金物理化学]