| 不同镍钴锰比对xLi2MnO3-(1-x)LiMO2正极材料的 结构和电化学性能的影响 |
| |
| 引用本文： | 彭继明,陈玉华,刘世成,胡思江,王红强,李庆余.不同镍钴锰比对xLi2MnO3-(1-x)LiMO2正极材料的 结构和电化学性能的影响[J].化工学报,2016,67(7):2950-2955. |
| |
| 作者姓名： | 彭继明 陈玉华 刘世成 胡思江 王红强 李庆余 |
| |
| 作者单位： | 1. 黄冈师范学院化工学院, 催化材料制备及应用湖北省重点实验室, 湖北 黄冈 438000;
2. 广西师范大学化学与药学学院, 低碳能源材料广西重点实验室, 广西 桂林 541004 |
| |
| 基金项目： | 国家自然科学基金项目（51474110，51364004）；湖北省高等学校优秀中青年科技创新团队计划（T201514）。 |
| |
| 摘 要： | 以NaOH和NH3·H2O为沉淀剂，采用共沉淀法成功合成富锂锰基层状正极材料。通过X射线粉末衍射（XRD）、拉曼光谱、扫描电子显微镜（SEM）、循环伏安法（CV）、电化学阻抗谱（EIS）和充放电测试等研究手段，重点探讨了不同镍钴锰比对富锂锰基层状正极材料的结构、形貌以及电化学性能的影响。其中Li1.2Mn0.54Ni0.13Co0.13O2正极材料结晶度高，粒度分布均匀，无明显团聚现象。在0.1C倍率下首次放电比容量为247.9 mA·h·g-1，首次库仑效率为75.1%。在1C倍率下首次放电比容量为236.2 mA·h·g-1，经过50次充放电循环后放电比容量为218.4 mA·h·g-1，容量保持率为88.3%，展现出较好的循环稳定性。
|
| 关 键 词： | 富锂 镍钴锰比 正极材料 锂离子电池 电子材料 电化学 制备 |
| 收稿时间： | 2015-09-28 |
| 修稿时间： | 2016-03-17 |
Effect of Ni/Co/Mn molar ratio on structure and electrochemical properties of xLi2MnO3-(1-x)LiMO2 cathode material |
| |
| PENG Jiming,CHEN Yuhua,LIU Shicheng,HU Sijiang,WANG Hongqiang,LI Qingyu.Effect of Ni/Co/Mn molar ratio on structure and electrochemical properties of xLi2MnO3-(1-x)LiMO2 cathode material[J].Journal of Chemical Industry and Engineering(China),2016,67(7):2950-2955. |
| |
| Authors: | PENG Jiming CHEN Yuhua LIU Shicheng HU Sijiang WANG Hongqiang LI Qingyu |
| |
| Affiliation: | 1. Hubei Key Laboratory for Processing and Application of Catalytic Materials, College of Chemical Engineering, Huanggang Normal University, Huanggang 438000, Hubei, China;
2. Guangxi Key Laboratory of Low Carbon Energy Materials, School of Chemistry and Pharmaceutical Sciences, Guangxi Normal University, Guilin 541004, Guangxi, China |
| |
| Abstract: | Li-rich layered cathode materials were synthesized by a facile co-precipitation method with NaOH and NH3·H2O. The effect of Ni/Co/Mn molar ratio on the structure, morphology and electrochemical properties of the as-prepared material were intensively investigated through X-ray diffraction (XRD), Raman spectra, scanning electron microscopy (SEM), cyclic voltammetry (CV), electrochemical impedance spectroscopy (EIS) and galvanostatic charge-discharge tests. The Li1.2Mn0.54Ni0.13Co0.13O2 sample had good crystallity, uniform distribution of particle size and excellent electrochemical performance. It delivered the largest initial discharge capacity (247.9 mA·h·g-1) and coulombic efficiency (75.1%) at 0.1C-rate. Furthermore, it showed a high discharge capacity of 236.2 mA·h·g-1 at 1C-rate and a capacity retention of 88.3% after 50 cycles. |
| |
| Keywords: | Li-rich Ni/Co/Mn molar ratio cathode material lithium ion battery electronic materials electrochemistry preparation |
|
| 点击此处可从《化工学报》浏览原始摘要信息 |
|
点击此处可从《化工学报》下载全文 |
|
