摘要
通过化学浴沉积技术在碳纳米管(Carbon nanotube,CNT)表面均匀环绕生长氧化镍(Nickel oxide,NiO)纳米片,采用X射线衍射仪和场发射扫描电镜测试方法观察其晶体结构和微观形貌,测试表明:CNT作为核心骨架,NiO纳米片在CNT表面均匀地立体生长。通过循环伏安与恒流充放电测试发现:NiO/CNT复合材料作为锂离子电池负极材料的比容量和循环性能有明显改善,在100 mA/g电流密度下NiO/CNT首次放电比容量1990mAh/g,比纯NiO的1560mAh/g提高了27.6%,循环30次后比容量仍保持在1500mAh/g,而NiO衰减到285mAh/g。其比容量和循环性能的改善,是由于CNT提高了复合材料整体的导电性能,NiO纳米片环绕生长在CNT表面上,促进活性材料与电解液的有效接触,增强NiO的电化学活性。
Nickel oxide（NiO）nanosheet grew evenly on the surface of carbon nanotube（CNT）by chemical bath deposition method.X-ray diffraction（XRD）and field emission scanning electron microscopy（SEM）were used to observe the crystal structure and microstructure.The result show that CNT is used as the core framework and NiO nanosheet uniformly grows on the surface of CNT.The cyclic voltammetry and galvanostatic charging-discharging tests show ta significant improvement of specific capacity and cycle performance when NiO/CNT composites were used as the negative electrode materials of lithium ion batteries.At the current density of 100 mA/g,initial discharge specific capacity of NiO/CNT was 1990 mAh/g increasing by 27.6% than the 1560 mAh/g of pure NiO material.After 30 cycles,the specific capacity remained at 1500 mAh/g,while that of pure NiO was reduced to 285 mAh/g.The improvement of specific capacity and cycle performance results from the improvement of electrical conductivity of the composites by CNT.The NiO nanosheet grows on the surface of CNT to expand the contact of active materials and electrolyte and enhance electrochemical activity.
出处
《浙江理工大学学报（自然科学版）》
2018年第2期176-181,共6页
Journal of Zhejiang Sci-Tech University(Natural Sciences)
