纳米钴铁复合氧化物的制备与电化学性能

Preparation and electrochemical properties of cobalt-iron 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钴铁复合氧化物粉末,并用X-射线衍射(XRD)对其结构进行了分析、透射电镜对其形貌进行了表征、充放电和循环性能等对其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25 nm的钴铁复合氧化物;充放电过程中从40周到50周,钴铁复合氧化物放电比容量由268.9 mAh/g衰减到250.2 mAh/g,放电容量保持率较高(93%),说明纳米钴铁复合氧化物具有较高的放电容量和良好的循环性能。

Nanocomposite oxides materials （Co3O4-Fe2O3） as anode materials for lithium-ion batteries were synthesized by precipitation method. The structure, morphology and electrochemical performance of the synthesized samples were investigated by XRD, TEM, charging and discharging and cycle performance. The results show that the particle sizes of obtained Co3O4-Fe2O3 through precipitation method intensively distribute, and the size is 25 nm. The sample of Co3O4-Fe2O3 has excellent electrochemical performance： from the 40th cycle to the 50th cycle, the discharge specific capacity of the sample decreases from 268.9 to 250.2 mAh/g, and the discharge capacity retention is up to 93%, showing that it has high discharge capacity and good cycle performance.