Al掺杂尖晶石LiMn_2O_4正极材料的性能  

Electrochemical Performance of Al-Doped Spinel LiMn_2O_4 Cathode Material for Li-Ion Batteries

作　　者：王永龙[1] 王文阁[1] 张倩[1] 王昕[1] 曹建胜[1] 叶世海[1] 

机构地区：[1]南开大学新能源材料化学研究所,天津300071

出　　处：《电化学》2013年第3期232-236,共5页Journal of Electrochemistry

基　　金：国家自然科学基金项目(No.21273119)资助

摘　　要：尖晶石LiMn2O4作为锂离子电池正极可大电流放电,且成本低、环境友好.采用溶胶-凝胶法制备尖晶石LiMn2O4及Al掺杂材料.使用X-射线衍射(XRD)和扫描电子显微镜(SEM)观察材料结构与形貌.结果表明,复合材料颗粒尺寸300-500 nm,呈类球形.电化学恒流充放电测试表明,Al掺杂尖晶石LiMn2O4电极的循环性明显提高,Al掺杂5%LiMn2O4(by mass,下同)正极在1C倍率充放电100周期循环后的容量保持率为98.2%,1C倍率充电、5C倍率放电下,100周期循环后其容量保持率为99.0%,表现出较优的电化学循环性能.Spinel LiMn2O4,a cathode material for Li-ion batteries,is featured as good high-rate performance,low cost and environmental friendly.The pristine and Al-doped LiMn2O4 samples were prepared by sol-gel method.The structure and micromorphology of the as-prepared samples were characterized by X-ray diffraction（XRD） and scanning electron microscopy（SEM）.The results demonstrated that the as-prepared LiMn2O4samples had a typical cubic spinel structure and were composed of sphere-like particles with a diameter range of 300 - 500 nm.Galvanostatic charge-discharge tests showed that the LiMn2O4samples doped with Al element exhibited an enhanced cycling performance.Especially,in the case of LiMn2O4 with 5% Al-doped,the discharge capacity retention was about 98.2% at the rate of 1C discharge and was 99% at the rate of 5C discharge,based on the same charge rate of 1C.

关 键 词：锂离子电池 正极 尖晶石结构 AL掺杂 循环性能 

分 类 号：TM912[电气工程—电力电子与电力传动]