ZnFe2O4的固相法和水热法制备及其电化学性能研究

本文用固相反应法和水热法制备了ZnFe₂O₄材料,X射线衍射(X-ray diffraction, XRD)表明制备出来的ZnFe₂O₄为尖晶石结构,表面形貌测试 (scanning electron microscopy, SEM) 显示两种方法制备的材料的平均粒径分别为500 nm和200 nm.比表面积测试结果表明,两种方法制备的样品的比表面积分别为136.7 m² g^{-1关键词： 2O₄')" href="#">ZnFe₂O₄ 尖晶石结构 电化学性能 锂离子电池}

Investigation of electrochemical performances of ZnFe2O4 prepared by solid state and hydrothermal method

Spinel structure ZnFe₂O₄ were prepared by solid state reaction and hydrothermal method. Investigations on X-ray diffraction (XRD), scanning electron microscopy (SEM) and specific area measuements indicate that the samples are well-crystallized cubic spinel structre with average particle sizes of 500 nm and 200 nm and specific areas of 136.7 m² g^-1 and 382.5 m² g^-1 for solid state reaction and hydrothermal method, respectively. The ZnFe₂O₄ samples show high lithium-storage capacity and good reversibility. Compared with the sample prepared by solid state reaction, ZnFe₂O₄ prepared by hydrothermal method demonstrate better electrochemical performances. Its specific charge capacity decays from 750 mAh g^-1 to 702 mAh g^-1 after 30 cycles, with capacity retention of 93.6 %. ZnFe₂O₄ is a very promising anode material for lithium ion battery for its easy preparation, low coat and good electrochemical performances.