纳米锡铁复合氧化物的制备与电化学性能

Preparation and electrochemical properties of tiniron nanocomposite oxides material

采用沉淀法制备了作为锂离子电池负极材料的纳米锡铁复合氧化物粉末,并用X射线衍射(XRD)对其结构进行了分析,用透射电镜(SEM)对其形貌进行了表征,对其充放电和循环性能等电化学性能进行了测试。结果表明,采用沉淀法可以制备出颗粒粒度分布较集中,尺寸为20nm的锡铁复合氧化物;充放电过程中从20～50周,锡铁复合氧化物放电比容量由285.6mAh/g衰减到279.1mAh/g,放电容量保持率较高(98%),说明纳米锡铁复合氧化物具有较高的放电比容量和良好的循环性能。

Nanocomposite oxides materials （SnO2- Fe2O3） as anode materials for lithium-ion batteries were synthesized by precipitation method. The crystalline structure and the electrochemical performance of the as-synthesized samples were investigated. The results show that the obtained nanocomposite oxides materials is SnO2- Fe2O3, and the as-prepared particles is 20 nm. The sample of SnO2- Fe2O3 has excellent electrochemical performance： from the 20^th cycle to the 50^th cycle, the discharge specific capacity decreases from 285.6 to 279,1 mAh/g, and the discharge capacity retention is 98%.