溶胶凝胶法制备LiNi0．03Mn1．97O4及其电化学性能

采用溶胶凝胶法合成锂离子电池正极材料LiNi0.03Mn1.97O4，使用X射线衍射（XRD）、扫描电子显微镜（SEM）对合成材料的结构及物理性能进行了表征。将合成材料作为锂离子电池正极活性材料，考察烧结温度对其结构及电化学性能的影响。随着烧结温度的升高，尖晶石型结构越来越完整，初始放电比容量增大，但循环性能却逐渐变差。在750℃下烧结温度12h得到了性能较好的HNi0.03Mn1.97O4，首次放电比容量为118．7mA·h／g，50次循环后，其放电比容量仍保持在101．6mA·h／g，适合作为锂离子电池的正极材料。

Synthesis of LiNi0.03Mn1.97O4 by sol-gel Route for Lithium Secondary Battery and Its Electrochemical Properties

The cathode materials LiNi0.03 Mn1.97 04 for lithium ion batteries were synthesized by the sol -gel method. The synthesized materials were characterized with X -ray diffraction （XRD） and analytical scanning electron microscope （SEM）. The as -prepared powders were used as cathode materials for lithium -ion battery, whose discharge capacity and cycle voltammogram properties were examined. The influences of sintering temperature on the structure and electrochemical properties of the product were investigated. With the increase of the sintering temperature, the spinel type structure becomed increasingly perfect and the initial specific discharge volume increased, but the cycling performance became gradually worse. The LiNi0. 03 Mn1. 97O4 powder with better performance would be obtained at sintering temperature 750℃ for 12 h. ,the initial and stable specific discharge volume were 118.7 mA · h/g. the discharge volume were still 101.6 mA · h/g after 50 cycles. It was suitable for use in Li - ion battery as cathode material.