Nanocrystalline transition metal ferrite thin films prepared by an electrochemical route for Li-ion batteries
Nanocrystalline transition metal ferrite thin films prepared by an electrochemical route for Li-ion batteries
复制标题
DOI：
10.1016/j.jpowsour.2004.10.015
复制
发表时间：
2005-03
影响因子：
9.2
通讯作者：
Yanna Nuli;Q. Qin
中科院分区：
文献类型：
--
作者：
Yanna Nuli;Q. Qin
采用阴极电沉积法制备了纳米晶铁氧体MFe2O4(M=Cu，Ni，Co)薄膜，并在室温下进行了进一步的阳极氧化。X射线衍射分析表明，CuFe2O4为四方尖晶石结构，NiFe2O4和CoFe2O4为立方结构。在扫描电子显微镜下观察到均匀的无裂纹和针孔的MFe2O4薄膜，估计所制备的铁氧体薄膜的平均晶粒尺寸约为50 nm。电化学测试表明，MFe2O4薄膜电极在0.01V~3.0V的电压范围内，在10−时的可逆容量为450~460mAhgμ−1,100次循环后仍保持75%以上的可逆容量。结果表明，MFe2O4薄膜可以作为薄膜锂离子电池的负极材料。
Nanocrystalline ferrite MFe2O4(M=Cu, Ni, Co) thin films have been prepared by an electrochemical route involving cathodic electrodeposition of MFe2alloys and further anodization of the alloy films at room temperature. XRD measurements showed that those films are polycrystalline with spinel tetragonal structure for CuFe2O4, and cubic structure for NiFe2O4and CoFe2O4, respectively. The uniform MFe2O4films without cracks and pinholes were observed in SEM measurement, and the estimated grain average sizes of as-prepared ferrite films were about 50nm. The electrochemical measurements showed that MFe2O4thin film electrodes delivered a reversible capacity of 450–460mAhg−1at 10μAcm−2in the voltage range of 0.01–3.0V and more than 75% reversible capacity still remained up to 100 cycles. Our results showed that MFe2O4thin films could be used as promising anode materials for thin film lithium-ion batteries.