【摘要】 以乙二醇为溶剂,硫代乙酰胺为硫源,在乙二胺的辅助下,采取简单的溶剂热法合成了由纳米棒组成的海胆状硫化镍空心球.扫描电镜图片揭示了海胆状空心结构,XRD测试结果表明,产物中存在α和β两种相结构,但主要组分为β-NiS.跟踪产物随时间的变化,研究了海胆状空心球的形成过程.首先形成实心的海胆状结构,进一步熟化导致空心结构的形成.作为锂离子电池的阴极材料,测定了海胆状硫化镍空心球的电化学性能,首次放电容量超过900 mA.h/g,高于理论容量,循环50次后,放电容量稳定在约200mA.h/g.更多还原

【Abstract】 Urchin-like nickel sulfide hollow spheres composed of nanorods were synthesized via a solvthermal method using thioacetamide as sulfur source and ethylene glycol as solvent under ethylenediamine assistant.The result of XRD indicated that there were two kinds of phase structure including α and β in the NiS products and the major product was β-NiS.The formation process of urchin-like nickel sulfide hollow spheres was investigated by monitoring the morphology variation of the product with reaction time.The results showed that urchin-like solid microspheres were formed firstly,then hollow structure were obtained via further "Ostwald ripening" process.Charge-discharge and cyclic performance of the products were determined as an cathode of lithium-ion batteries.The first discharge-charge capacity was 900 mA·h/g,and 200 mA·h/g was still remained after 50 cycles.更多还原