锂离子电池负极材料LiFeTiO4／C的制备及其电化学性能

摘要

Carbon coated LiFeTiO4 cathode materials for Li⁃ion batteries were prepared via high temperature solid⁃state method with Li2CO3,Fe2O3 and TiO2 as raw material and glucose as carbon resource. The structure and morphology of the as⁃prepared cathode materials were characterized by X⁃ray diffraction ( XRD ) , Fourier transform infrared spectrometer ( FTIR) and transmission electron microscopy ( TEM) . The electrochemical performance of LiFeTiO4 was investigated by galvanostatic charge⁃discharge tests, cyclic voltammetry ( CV) and AC impedance method. The results showed that the carbon coated material has better cycle performance than that without the carbon coating. The initial discharge capacity of LiFeTiO4/C at 0.5C was 327.8 mAh/g and its capacity could retain at 308.3 mAh/g after 50 cycles.%以Li2 CO3、Fe2 O3和TiO2为原料，葡萄糖为碳源，采用高温固相法合成了锂离子电池LiFeTiO4／C复合材料。采用X射线衍射（ XRD）、傅里叶红外光谱（ FTIR）、透射电子显微镜（ TEM）等手段对材料的晶体结构和形貌进行了表征，通过恒流充放电、循环伏安（ CV）和交流阻抗对材料的电化学性能进行了测试。结果表明，碳包覆后的LiFeTiO4负极材料循环性能优于未经碳包覆的材料。在室温下，充放电倍率为0．5C时，LiFeTiO4／C负极材料的首次放电比容量为327．8 mAh／g，循环50周后仍保持在308．3 mAh／g。