CAJ | 학술논문

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 mA/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 mA·h/g,高于石墨材料的理论比容量(372 mA·h/g).
이다벽탄납미관( MWCNT)위모판,통과정규산을지( TEOS)적수해축취반응제득MWCNT@SiO2납미동축전람.채용투사전자현미경(TEM)、소묘전자현미경(SEM)화전화학측시대양품적형모、결구급전화학성능진행표정.결과표명, MWCNT표면포복료일층후도균균적다공SiO2층,리우기획득교호적저리성능.작위리리자전지부겁재료, MWCNT@SiO2납미동축전람표현출료교고적비용량화교호적순배성능.재100 mA/g전류밀도하경과80차순배, MWCNT@SiO2납미동축전람적방전비용량잉고체431.7 mA·h/g,고우석묵재료적이론비용량(372 mA·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) .