微波辅助液相燃烧法制备钼掺杂LiMn_(2)O_(4)正极材料研究

Preparation of Mo-doped LiMn_(2)O_(4) cathode material by microwave-assisted liquid phase combustion

采用微波辅助液相燃烧法制备了一系列LiMo_(x)Mn_(2-x)O_(4)(x=0,0.01,0.03,0.05)正极材料,通过XRD、SEM、CV等表征分析了材料的晶体结构、微观形貌和电化学性能。XRD和SEM数据表明,掺杂钼不会改变尖晶石型锰酸锂的结构,但能够提高材料的结晶性,掺杂钼后的样品颗粒分散均匀,形状更为规整。电化学性能测试结果表明,x=0.01时,样品的性能最佳,在室温、1C的放电条件下,LiMo_(0.01)Mn_(1.99)O_(4)的首次放电比容量可达116.9mAh/g,高于纯锰酸锂的首次放电比容量(108mAh/g)。由此可见,适量钼的掺杂能够改善锰酸锂材料的结晶性,并提高材料的首次放电比容量。

A series of LiMo_(x)Mn_(2-x)O_(4)(x=0,0.01,0.03,0.05)cathode materials were successfully prepared by microwave-assisted liquid phase combustion method.The crystal structure,microstructure and electrochemical performance of the materials were analyzed by XRD,SEM and CV.The XRD and SEM data shown that doping molybdenum did not change the structure of spinel LiMn2O4,and it can improve the crystallinity of the material.The Mo-doped sample particles were uniformly dispersed and the shape was more regular.The electrochemical performance test results shown that the sample was best when x=0.01.At room temperature and 1Cdischarge,the first discharge specific capacity of LiMo_(0.01)Mn_(1.99)O_(4) can reach 116.9mAh/g,which was higher than pure LiMn2O4 of was only 108 mAh/g.Therefore,the Mo doping with appropriate amount can improve the crystallinity of the LiMn2O4 material,and provided the first discharge specific capacity of the material.