用新型的半固相方法合成掺钴尖晶石材料LiCo_xMn_(2-x)O_4及其性能研究

用一种新型的半固相法合成得到LiCo_xMn_(2-x)O_4材料，通过X射线衍射技术 和充放电实验对材料的结构及循环性能进行了研究。与传统的固相合成法相比，这 种半固相法显示了产物颗粒尺寸均匀，电化学性能良好的特点。通过对结构，组成 与电化学性能关系的探讨，对不同半固相法合成路线的选择及适当的优化，可得到 电化学性能良好的掺钴尖晶石材料，其中LiCo_(0.016)Mn_(1.984)O_4在室温下的 初始容量为118 mA·h/g，循环25周后，容量仍能保持在113 mA·h/g左右。通过这 种新型合成方法得到的掺钴尖晶石材料，在高温下也表现出了令人满意的充入电循 环性能。

A New Quasi Solid-state Method to Synthesize Cobalt-doped LiCo_xMn_ (2-x)O_4 Spinel Materials and Investigation on Their Electrochemical Performances

Cobalt-doped LiCo_xMn_(2-x)O_4 spinel material was synthesized by a new quasi solid-state method, in which xCo_2O_3·MnO_2 was prepared through co-precipitation from liquid phase. The structural and electrochemical properties of the material were studied by XRD and electrochemical measurements. Compared with traditional solid-state method, the new technique has the advantage of uniform size- distribution and better electrochemical performance. Through comparing the structure and electrochemical behavior of the cobalt-doped spinel materials that were prepared by different precursor, an optimal synthetic route has been chosen. The product obtained has desired electrochemical property. For example, LiCo_(0.016)Mn_(1.984)O_4 synthesized through an optimized route can yield 118 mA·h/g in its initial initial discharge and maintained at 113 mA·h/g after being cycled 25 times at room temperature. The cobalt-doped spinel samples prepared by the new technique also show good electrochemical performance at high temperatures.