摘要
以多壁碳纳米管(MWCNT)为模板,通过正硅酸乙酯(TEOS)的水解缩聚反应制得MWCNT@SiO2纳米同轴电缆.采用透射电子显微镜(TEM)、扫描电子显微镜(SEM)和电化学测试对样品的形貌、结构及电化学性能进行表征.结果表明,MWCNT表面包覆了一层厚度均匀的多孔SiO2层,利于其获得较好的储锂性能.作为锂离子电池负极材料,MWCNT@SiO2纳米同轴电缆表现出了较高的比容量和较好的循环性能.在100 m A/g电流密度下经过80次循环,MWCNT@SiO2纳米同轴电缆的放电比容量仍高达431.7 m A·h/g,高于石墨材料的理论比容量(372 m A·h/g).
MWCNT@SiO2 coaxial nanocables were prepared via a facile hydrolysis-condensation process of tetraethyl orthosilicate（ TEOS） with multi-walled carbon nanotubes（ MWCNT） as templates. The morphology, structure and electrochemical performance of the nanohybrids were characterized by transmission electron mi- croscopy（ TEM） , scanning electron microscopy （ SEM ） , and electrochemical measurements. It is indicated that the MWCNT templates have been fully wrapped by SiO2 layer with uniform thickness and porous nature, which is beneficial for the enhanced Li-storage capabilities of the MWCNT@ SiO2 nanohybrids. When evaluated as anode materials for Li-ion battery, the MWCNT@SiO2 coaxial nanocables exhibit high specific capacities and excellent cycling performance. For example, the MWCNT@SiO2 coaxial nanocables are able to deliver a high discharge capacity of 431. 7 mA·h/g after 80 cycles at a current density of 100 mA/g, which is higher than the theoretical capacity of graphite（372 mA·;h/g）. The facile synthetic methodology and en- hanced lithium-storage performances of the MWCNT@SiO2 coaxial nanocables make it an ideal anodic candi- date for high-energy and long-life Li-ion batteries（ LIBs） .
出处
《高等学校化学学报》
SCIE
EI
CAS
CSCD
北大核心
2015年第1期175-179,共5页
Chemical Journal of Chinese Universities
基金
江苏省产学研前瞻性研究项目(批准号:BY2013001-01)
江苏省自然科学基金(批准号:BK20130900)
江苏省高校自然科学基金(批准号:13KJB150026)资助~~
