摘要
以柠檬酸、EDTA为络合剂,CoCl2、SnCl4为主盐的基础电解液,首先在基础电解液中加入硬碳制备Sn-Co-C复合电极材料。SEM观察表明获得的Sn-Co-C复合电极表面为镶嵌C小颗粒的菜花状结构,C物理夹杂在Sn-Co合金中,硬碳的引入使得电极材料的循环性能得到提高,首次充放电比容量分别为563.8和763.2 mA.h/g,而经过50次循环后充放电比容量分别为400.3和416.2 mA.h/g。然后,在基础电解液中加入甲酸,在聚苯乙烯微球(PS)为模板的辅助下制备孔状结构Sn-Co-C复合材料。获得的材料中Sn、Co、C的原子比分别为36.87%,2.82%,20.61%。充放电测试结果表明,孔状结构的Sn-Co-C电极表现出更好的循环性能,首次充放电比容量分别为821.1和946.6 mA.h/g,循环第50次后充放电比容量为401和457.6 mA.h/g,循环第60次后充放电比容量为349.7和401.5 mA.h/g,放电比容量达到400 mA.h/g以上。
Sn-Co-C alloy negative electrode was prepared by template-electro-deposition method using electrolyte solution of CoCl2 and SnCl4 with citric acid and EDTA as the complexing agent.SEM images show that the cauliflower-like structure embedding many small particles of carbon is observed on the Sn-Co-C alloy surface.Charge-discharge tests demonstrate that Sn-Co-C electrodes keep a specific capacity of 400 mA.h /g after 50 cycles.The macroporous structure Sn-Co-C composite material was prepared by electro-deposition through adding formic acid solution in the electrolyte solution with polystyrene microspheres（PS） as a template-assistant.The atomic ratio of Sn,Co and C in the macroporous structure Sn-Co-C is 36.87%,2.82% and 20.61%,respectively.Charge-discharge tests show that the macroporous structure of Sn-Co-C electrode show the better cycling performance,the first charge-discharge capacity is 821.1 and 946.6 mA.h /g,and the charge-discharge capacity is 401 and 457.6 mA.h /g after 50 cycles,charge-discharge capacity keep a specific capacity of 349.7 and 401.5 mA.h /g after the 60th cycles,and the discharge capacity is high than 400 mA.h /g.
出处
《材料热处理学报》
EI
CAS
CSCD
北大核心
2010年第7期20-24,共5页
Transactions of Materials and Heat Treatment
基金
国家高技术研究发展计划(2006AA03Z230)
北京市自然科学基金(2062014)
