An Investigation of Structural Properties of Li-Al-mixed Doped Spinels Materials Li_(1+x) Al_yMn_(2-y)O_4

采用一种简单的合成工艺 ,将铝和锂混合掺入到主尖晶石相锰酸锂中 ,研究不同掺杂铝量对材料的初始容量及循环稳定性能的影响 .结果表明同时掺杂铝锂的材料要比单独掺杂铝或锂的循环稳定性好 .利用扫描电镜、粉末X_射线衍射仪、红外光谱仪对材料形貌及结构进行研究 ,结果表明所合成的掺杂铝锂材料颗粒细小、分布均匀 ,具有较好的结晶性能 ,较高的初始容量和良好的循环稳定性 ,其初始容量达 119mAh/g ,循环 2 0 0次后容量仍然保持在 10 6mAh/gAl and Li elements were co_doped into host spinel lithium manganese oxide by a simple and economical preparation technology . There was an investigation of the influence of doped Al contents on the initial capacity and cycling performance of the materials. The investigation of the XRD patterns, the analysis of the SEM micrographs and the determination of IR spectroscopy showed that the particles of dopant materials are fine, narrowly distributed and well crystallized, and the bonds Mn_O are stronger than these of undoped materials. The resulted materials have a high initial capacity of 119 mAh/g and good cycling characterization. The capacity still kept at 106 mAh/g after 200 cycles.作者联系地址：清华大学材料系新型陶瓷与精细工艺国家重点实验室,清华大学材料系新型陶瓷与精细工艺国家重点实验室,清华大学材料系新型陶瓷与精细工艺国家重点实验室,清华大学材料系新型陶瓷与精细工艺国家重点实验室 北京100084 ,北京100084 ,北京100084 ,北京100084Author's Address: Dept. of Materials Sci. and Engin. State Key Lab. of New Ceramics and Fine Processing, Tsinghua Univ., Beijing 10084, Chin