碳化
材料科学
电极
滤纸
化学工程
锡
法拉第效率
电化学
碳纤维
纳米技术
循环伏安法
复合材料
化学
扫描电子显微镜
冶金
物理化学
工程类
复合数
出处
期刊:Carbon
[Elsevier]
日期:2015-06-01
卷期号:87: 70-77
被引量:40
标识
DOI:10.1016/j.carbon.2015.02.020
摘要
Sodium-ion batteries (SIBs) are, arguably, one of the most promising candidates for post-lithium ion battery era. The success of sodium-ion batteries is dependent on electrode materials developed. We reported here the facile preparation of carbonized filter paper decorated with [email protected] nanospheres as negative electrode materials for SIBs. The carbonized filter paper decorated with [email protected] nanospheres were obtained by in-situ carbonization of the cellulose paper fibers and the reduction of SnO2 to metallic Sn which were encapsulated with carbon sheaths by chemical vapor deposition (CVD). Particularly, both the carbon sheaths and the encapsulated Sn cores are spherical. The formation mechanism of the spherical [email protected] nanospheres was proposed based on unique properties of molten tin with high surface tension forming spherical droplets. The carbonized filter paper decorated with [email protected] nanospheres in the form of slices can be directly assembled into electrochemical cells without any further treatment or additives. Higher capacities and better Coulombic efficiencies than that of bare carbonized filter paper were achieved. The mechanism of capacity fading was investigated systematically by cyclic voltammetry (CV) and post-test analysis. This understanding will be helpful to design better Sn based electrodes for SIBs.
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