Al^3+掺杂对LiNi0.5Mn1.5O4材料性能的影响  

Effect of Al^3+doping on the properties of LiNi0.5Mn1.5O4 materials

作　　者：孙健铭 谭毅[1,2] 王凯 李鹏廷[1,2] 薛冰 SUN Jianming;TAN Yi;WANG Kai;LI Pengting;XUE Bing(School of Materials Science and Engineering,Dalian University of Technology,Dalian 116024,Liaoning,China;Key Laboratory for Solar Energy Photovoltaic System of Liaoning Province,Dalian 116024,Liaoning,China)

机构地区：[1]大连理工大学材料科学与工程学院,辽宁大连116024 [2]辽宁省太阳能光伏系统重点实验室,辽宁大连116024

出　　处：《精细化工》2020年第3期500-506,共7页Fine Chemicals

基　　金：中央高校基本科研业务费专项资金资助(DUTl8ZD206)。

摘　　要：制备了不同Al^3+掺杂量(x)的Li1+xAlxNi0.5Mn1.5–xO4(LNMO)材料,通过XRD、SEM等对LNMO材料的结构进行了表征,通过CV测试、交流阻抗谱测试等方法测定了材料的电化学性能,讨论了Al^3+的掺杂量对材料结构和性能的影响。结果表明,适当的Al^3+掺杂会提高材料的结构稳定性及循环、倍率性能。当x=0.06时改性效果最好,在0.5和2.0 C下循环100次的容量保持率分别达到95.2%和90.0%。而且氧化还原峰的电势差较小,循环可逆性能最好。在该基础上,通过聚合物辅助法制备的样品由于{111}晶面族取向性更强,进一步提升了循环性能,0.5和2.0 C下循环100次容量保持率分别达到97.1%和93.0%。Li1+xAlxNi0.5 Mn1.5–xO4(LNMO)materials with different Al^3+doping amount(x)were prepared and characterized by XRD and SEM and so on techniques.The electrochemical properties of the samples were determined by CV test and AC impedance spectroscopy.The influence of Al^3+doping amount on the structure and properties of materials was discussed.The results showed that proper Al^3+doping increased the structural stability,cycle and rate performance of the material.When Al^3+doping amount was 0.06,the prepared sample had the best properties,the retention rates of circulating 100 times at 0.5 and 2.0 C reached 95.2%and 90.0%,respectively.Moreover,the potential difference of the redox peak was small,and the cycle reversibility was the best.The samples prepared by polymer-assisted method further improved the cycle performance due to the stronger orientation of{111}crystal plane,the 100 times retention rates at 0.5 and 2.0 C reached 97.1%and 93.0%,respectively.

关 键 词：锂离子电池 掺杂Al^3+ LINI0.5MN1.5O4 聚合物辅助法 循环性能 电子化学品 

分 类 号：TM912[电气工程—电力电子与电力传动]