| 焙烧气氛对LiNi0.5Mn0.5O2中Li/Ni混排及电化学性能的影响 |
| |
| 引用本文： | 王晓亚,程前,黄桃,余爱水.焙烧气氛对LiNi0.5Mn0.5O2中Li/Ni混排及电化学性能的影响[J].物理化学学报,2011,27(2):437-442. |
| |
| 作者姓名： | 王晓亚 程前 黄桃 余爱水 |
| |
| 作者单位： | Department of Chemistry, Shanghai Key Laboratory of Molecular Catalysis and Innovative Materials, Institute of New Energy, Fudan University, Shanghai 200438, P. R. China |
| |
| 基金项目： | 国家重点基础研究发展规划(973)(2009CB220100); 国家高技术研究发展计划(863)(2009AA033701); 上海催化材料功能研究实验室(08DZ2270500)资助项目~~ |
| |
| 摘 要： | 用固相法分别在氧气和空气气氛下合成了层状锂离子电池正极材料LiNi0.5Mn0.5O2, 采用X射线衍射(XRD)、扫描电镜(SEM)、透射电镜(TEM)、电化学阻抗谱(EIS)及充放电性能测试对其结构、形貌和电化学性质进行表征, 用Rietveld精修计算晶体结构中的Li/Ni混排率, 研究了混排率与电化学性能的关系. 结果显示, 在不同的焙烧气氛下均能合成出纯相和结晶性良好的LiNi0.5Mn0.5O2, 但两种材料在电化学性能上存在一定的差异. 氧气气氛下焙烧合成的材料在首次放电容量, 循环稳定性方面均优于空气气氛下合成的材料. 在0.1C充放电条件下氧气气氛下焙烧得到的LiNi0.5Mn0.5O2材料首次放电容量达到178 mAh·g-1, 充放电循环50圈后容量为165 mAh·g-1, 容量保持率为92.7%; 而在空气气氛下焙烧得到的LiNi0.5Mn0.5O2材料首次放电容量为164 mAh·g-1, 充放电循环50圈后容量为137 mAh·g-1, 容量保持率为83.5%. 氧气气氛下合成的材料具有较优的电化学性能可归因于氧气气氛下焙烧合成的LiNi0.5Mn0.5O2具有较小的Li/Ni混排率.
|
| 关 键 词： | 锂离子电池 正极材料 LiNi0.5Mn0.5O2 Li/Ni混排 焙烧气氛 |
| 收稿时间： | 2010-10-23 |
| 修稿时间： | 2011-01-13 |
Effect of Calcination Atmosphere on Li/Ni Disorder and Electrochemical Performance of Layered LiNi0.5Mn0.5O2 |
| |
| WANG Xiao-Ya,CHENG Qian,HUANG Tao,YU Ai-Shui.Effect of Calcination Atmosphere on Li/Ni Disorder and Electrochemical Performance of Layered LiNi0.5Mn0.5O2[J].Acta Physico-Chimica Sinica,2011,27(2):437-442. |
| |
| Authors: | WANG Xiao-Ya CHENG Qian HUANG Tao YU Ai-Shui |
| |
| Institution: | Department of Chemistry, Shanghai Key Laboratory of Molecular Catalysis and Innovative Materials, Institute of New Energy, Fudan University, Shanghai 200438, P. R. China |
| |
| Abstract: | Layered LiNi0.5Mn0.5O2 was synthesized by a solid state reaction method under air or oxygen atmosphere.The obtained materials were characterized by X-ray diffraction(XRD),scanning electron microscopy(SEM),transmission electron microscopy(TEM),electrochemical impedance spectroscopy(EIS),and charge-discharge tests.The results show that the LiNi0.5Mn0.5O2 synthesized by the solid state reaction method under both air and oxygen atmospheres give a pure phase and good crystallinity,however,their electrochemical p... |
| |
| Keywords: | Lithium ion battery Cathode material LiNi0 5Mn0 5O2 Li/Ni exchange Calcination atmosphere |
| 本文献已被 CNKI 万方数据 等数据库收录！ |
| 点击此处可从《物理化学学报》浏览原始摘要信息 |
| 点击此处可从《物理化学学报》下载免费的PDF全文 |
|
