高性能锂离子电池SiO/C/G复合负极材料研究  

High-performance SiO/C/G Composite Anode for Lithium Ion Batteries

作　　者：石长川[1] 杨学林[1] 张露露[1] 周永涛[1] 温兆银[2] 

机构地区：[1]三峡大学机械与材料学院,宜昌443002 [2]中国科学院上海硅酸盐研究所,上海200050

出　　处：《无机材料学报》2013年第9期943-948,共6页Journal of Inorganic Materials

基　　金：国家自然科学基金(50972075;51272128);湖北省杰出青年基金(2011CDA093)~~

摘　　要：以一氧化硅、蔗糖及天然石墨为原料,通过高能球磨和热解工艺制备了电化学性能优异的SiO/C/G复合负极材料。采用X射线衍射仪(XRD)和扫描电子显微镜(SEM)对复合材料的物相和形貌进行了表征。所制备的复合材料中,纳米SiO颗粒(<50 nm=被无定形碳粘结并均匀分散在石墨鳞片上。电化学性能测试表明,该复合材料100次循环后,可逆容量高达1108.9 mAh/g,容量保持率为103.8%。优异的电化学性能主要归因于纳米SiO颗粒在无定形碳基体中的均匀分布、无定形碳基体的缓冲作用和石墨相对复合材料导电性能的改善。Silicon monoxide/carbon/graphite （SiO/C/G） composite with high capacity and excellent cycling per- formance has been successfully synthesized via high-energy mechanical milling and followed pyrolysis of silicon monoxide/sucrose/natural graphite mixture. The phase composition and morphology of the samples were characterized by X-ray diffractometer （XRD） and scanning electron microscope （SEM）. Nano-sized （〈50 nm） SiO particles were bonded by amorphous carbon and homogenously dispersed on graphite flakes in the as-prepared composite. After 100 cycles, the composite electrode kept a reversible capacity of 1108.9 mAh/g with the capacity retention of 103.8%. Uniform distribution of SiO particles in the amorphous carbon matrix, better buffering effect of carbon matrix and en- hanced electrical conductivity are responsible for the superior electrochemical performance.

关 键 词：SIO C G 天然石墨 负极 锂离子电池 

分 类 号：TQ174[化学工程—陶瓷工业]