摘要
采用软化学方法控制氧化石墨表面含氧官能团的数量,一步完成了石墨烯/Fe2O3纳米复合材料的控制合成。采用XRD和Raman光谱分析及TEM表征复合材料的组成、结构和微观形貌特征,并对石墨烯/Fe2O3复合负极的电化学储锂性能进行了研究。结果表明,石墨烯/Fe2O3复合材料作为锂离子电池负极材料具有较高的储锂容量和倍率性能,充放电循环性能稳定。在100 mA/g的电流密度下循环100次,可逆容量为606 mAh/g,放电效率保持在91%;在2 A/g下放电容量是其在250 mA/g下放电容量的58.2%。
The quality of oxygen-containing groups on the surface of graphite oxides was controled by soft chemical method, and graphene/Fe2O3 nano composites were synthesized in one-step. The composition, structure and morphology of the composites were characterized by XRD, Raman and TEM, respectively. The electrochemical Li-storage performance of graphene/Fe2O3 composite electrode was also studied in this article. Graphene/Fe2O3 composites demonstrate a high lithium-storage capability, good rate capability, and stable cycling performance. After 100 stable charge and discharge cycles, graphene/ Fe2O3 composite electrode exhibits a high reversible capacity of 606 mAh/g at 100 mA/g. The discharge efficiency maintains at 91%. Moreover, the reversible discharge capacity of this electrode at 2 A/g is 58. 2% of that at 250 mA/g.
出处
《人工晶体学报》
EI
CAS
CSCD
北大核心
2014年第5期1217-1222,共6页
Journal of Synthetic Crystals
基金
哈尔滨市科技创新人才基金(2012RFLXG032)
黑龙江省教育厅科研项目(12521465)
黑龙江省留学回国人员择优资助资金
黑龙江科技大学引进优秀人才基金(11-08)
关键词
石墨烯
FE2O3
放电容量
储锂性能
graphene/Fe2O3
synthesis
discharge capacity
Li storage performance
