SnO_2@rGO钠离子电池负极材料的性能分析

Performance of SnO_2@rGO composite as anode of sodium ion battery

以改良Hummers法制备的氧化石墨(GO)为碳源,采用水热法将制备的纳米SnO_2覆载在氧化石墨表面,经球磨和热还原后得到SnO_2@r GO复合材料。利用SEM,Raman,XRD对SnO_2@r GO的形貌、组成及结构进行了表征。以SnO_2@r GO为活性物质制备钠离子电池负极,对电池的循环稳定性、库伦效率进行了测定。结果表明,纳米SnO_2较好地分布在氧化石墨层表面形成复合材料,其比表面积达到102.1 m^2/g。电化学测试显示,当电流密度为100 mA/g时,SnO_2@r GO钠离子电池比容量达到339 m A·h/g,循环100次后的电池效率还能达到98.75%。以SnO_2@r GO作为钠离子电池负极材料,可提高电池的容量保持率和循环稳定性。

Graphite oxide（GO） was prepared by the improved Hummers method, and the nano-SnO2 loads were prepared by hydrothermal method. After ball milling and thermal reduction,SnO2@rGO composite material was obtained. The morphology, composition and structure of SnO2@rGO were characterized by SEM, Raman and XRD, respectively. The negative electrode of sodium ion battery was prepared by SnO2@rGO, and the stability of the battery and coulomb efficiency were measured. The results showed that nano-SnO2 was well distributed to form composite materials on the surface of graphite oxide, which surface area reached 102.1 m^2/g. The electrochemical testing results showed that the ratio of the battery in the 100 mA/g current density to SnO2@rGO reached 339 mA·h/g, which efficiency after 100 cycles was still 98.75%. The results showed that SnO2@rGO had good capacity retention ratio and cyclic stability as a negative electrode material of sodium ion battery.