尖晶石Li_(1.06)Mn_2O_4的合成及其电化学性能

Synthesis of spinel Li_(1.06)Mn_2O_4 materials and its electrochemical properties

利用热重-差热曲线(TG-DTA)对LiOH·H2O+MnO2前驱体进行了分析,通过高温固相法合成了材料,考察了煅烧温度和煅烧时间的影响。采用X射线衍射光谱法(XRD)、循环伏安(CV)和电化学阻抗(EIS)对材料的结构、形貌和电化学性能进行了研究。结果表明,合成尖晶石Li1.06Mn2O4的最优条件为煅烧温度850℃、煅烧时间18 h,合成的材料,室温下0.1 C放电,其首次放电比容量为128.3 mAh/g,循环6次后放电比容量仍保持在122.0 mAh/g,电化学性能及结晶度均较好。

The precursor was analyzed by using gravimetric. The materials was synthesized by high temperature solid state method. The effect of the calcination temperature and calcination time was investigated. The structure, morphology and electrochemical performance of the materials were studied by X-ray diffraction （XRD）, cyclic voltammetry（CV） and electrochemical impedance spectroscopy（EIS）. The results show that 850 ℃ and 18 h are the optimal conditions to obtained materials with high charge and discharge specific capacity and stable cycling performance. At room temperature and 0.1 C discharge, the initial discharge capacity of material was 128.3 mAh/g; after 6 cycles, the discharge capacity was remained 122.0 mAh/g, both of the Electrochemical performance and crystallinity were good.