摘要
采用SEM,N2吸附技术和XRD对首次用于锂离子电池电极的规整中孔碳分子筛CMK-5的表面形态、孔结构和晶体结构进行了表征.利用恒电流仪和伏安循环法研究了CMK-5的电化学性质,并与传统的阳极材料石墨进行对比.结果表明,CMK-5具有良好的可逆特性,在第三次充电-放电循环中贮能密度仍可达525mAh/g,由于CMK-5具有特殊的中孔结构,因而更适合用作快速充电-放电循环材料.一个有趣的现象是,CMK-5在伏安循环的正值部分没有出现极值,这与传统阳极材料显著不同.另外,还利用XPS和XRD考察了CMK-5的充电-放电特性.
Ordered mesoporous carbon CMK-5 was comprehensively tested for the first time as electrode materials in lithium ion battery. The surface morphology, pore structure and crystal structure were investigated by Scanning Electronic Microscopy (SEM), N-2 adsorption technique and X-ray diffraction (XRD) respectively. Electrochemical properties of CMK-5 were studied by galvanostatic cycling and cyclic voltammetry, and compared with conventional anode material graphite. Results showed that the reversible capacity of CMK-5 was 525 mAh/g at the third charge-discharge cycle and that CMK-5 was more compatible for quick charge-discharge cycling because of its special mesoporous structure. Of special interest was that the CMK-5 gave no peak on its positive sweep of the cyclic voltammetry, which was different from all the other known anode materials. Besides, X-ray photoelectron spectroscopy (XPS) and XRD were also applied to investigate the charge-discharge characteristics of CMK-5.
出处
《化学学报》
SCIE
CAS
CSCD
北大核心
2005年第9期819-826,i002,共9页
Acta Chimica Sinica
基金
AustraliaResearchCouncil基金(No.20021186)资助项目.
