| LaF3表面修饰LiMn2O4的合成方法及电化学性能的研究 | |
| LaF3-Coated LiMn2O4: Synthesis and Improved Performance | |
| 摘要: 通过高温固相法制得尖晶石LiMn2O4,然后在通过简单易行的无水乙醇蒸干法包覆LaF3来修饰LiMn2O4。利用XRD,SEM来表征LaF3修饰的LiMn2O4的结构和形貌特征,并通过电化学测试研究LaF3修饰LiMn2O4的高温和常温下的电化学性能,另外结合电化学阻抗谱(EIS)和循环伏安(CV)考察表面修饰的锰酸锂的循环阻抗和循环可逆性。结果显示:经LaF3修饰过的LiMn2O4仍具有尖晶石结构,并且具有良好的电学性能。其中,以3wt%的修饰效果最好,常温循环100次和高温循环50次的循环保持率分别是91%和90%;而且,EIS和CV分别表明经LaF3修饰的LiMn2O4的电荷传递阻抗明显减小,其循环可逆性也明显提高。 | |
| 关键词: LiMn2O4 LaF3 包覆 锂离子电池 电化学性能 | |
| 基金项目: | |
| Abstract: Spinel LiMn2O4 was coated by LaF3 via a facile immersion-evaporation process. The results of the X-ray diffraction (XRD) and scanning electron microscope (SEM) indicate that the surface of all LaF3-coated LiMn2O4 samples is homogeneously covered by LaF3, while the spinel structure remains. The electrochemical performances of all samples were investigated at 25 ℃ and 55 ℃, respectively. The results show that the electrochemical performance of all LaF3-coated LiMn2O4 is better than that of pristine-LiMn2O4. Among them, the 3wt% LaF3-coated LiMn2O4 has the best cycling and rate performance compared to other samples, with the capacity retention of 91% at room temperature and 90% at 55 ℃. | |
| Keywords: LiMn2O4 lanthanum fluoride coating lithium-ion batteries electrochemical performances | |
| 投稿时间：2014-07-13 修订日期：2014-09-16 | |
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| 王婷,王弯,朱丁,段晓波,魏治乾,陈云贵.LaF3表面修饰LiMn2O4的合成方法及电化学性能的研究[J].无机化学学报,2014,30(11):2461-2468. | |
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