于月,向明武,白红丽,刘晓芳,郭俊明.固相燃烧法快速合成LiNi0.03Mg0.10Mn1.87O4正极材料及电性能研究[J].稀有金属材料与工程,2020,49(4):1437~1444.[Yu Yue,Xiang Mingwu,Bai Hongli,Liu Xiaofang,Guo Junming.Rapid Synthesis of LiNi0.03Mg0.10Mn1.87O4 Cathode Material by Solid-state Combustion Method and its Electrochemical Properties[J].Rare Metal Materials and Engineering,2020,49(4):1437~1444.]
固相燃烧法快速合成LiNi0.03Mg0.10Mn1.87O4正极材料及电性能研究
投稿时间:2018-12-29  修订日期:2019-03-04
中文关键词:  LiMn2O4  正极材料  Ni-Mg共掺杂  结构稳定性  Jahn-Teller效应
基金项目:国家自然科学基金资助(项目号U1602273,51462036)
中文摘要:
      采用固相燃烧法在500℃反应1 h后然后进一步在650℃二次焙烧6 h,快速合成了Ni、Mg共掺杂的LiNi0.03Mg0.10Mn1.87O4正极材料。借助X射线衍射仪(XRD)、扫描电镜(SEM)、透射电镜(TEM)、X射线衍射光谱仪(XPS)和电化学测试等对材料的结构、形貌、物相和电化学性能进行测试。结果表明:LiNi0.03Mg0.10Mn1.87O4正极材料为立方尖晶石型结构,颗粒尺寸在100-200 nm之间,为多面体形貌。合成的LiNi0.03Mg0.10Mn1.87O4材料有良好的电化学性能,在1 C时首次放电比容量为107.6 mAh.g-1,10 C首次放电比容量有68.7 mAh.g-1,在55℃、1 C首次放电比容量有103.7 mAh.g-1,CV和EIS测试得出该材料有较大的锂离子扩散系数为1.038×10-11 cm2s-1和较小的活化能32.69 kJ.mol-1,对循环1000次后的极片进行剖面分析,该材料的晶体结构和颗粒形貌基本没有变化,适量Ni、Mg共掺杂能够有效提高尖晶石型LiMn2O4在循环过程中的容量衰减和结构稳定性,抑制了Jahn-Teller效应。
Rapid Synthesis of LiNi0.03Mg0.10Mn1.87O4 Cathode Material by Solid-state Combustion Method and its Electrochemical Properties
英文关键词:LiMn2O4  cathode materials  Ni-Mg co-doping  structure stability  Jahn-Teller effect
英文摘要:
      Ni-Mg co-doped LiNi0.03Mg0.10Mn1.87O4 cathode material was synthesized by solid-state combustion method at 500℃ for 1 h and further calcined at 650℃ for 6 h. The structure, morphology, phase and electrochemical properties of the material were tested by X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray diffraction spectrometry (XPS) and electrochemical tests. The results show that the LiNi0.03Mg0.10Mn1.87O4 has a cubic spinel structure with a particle size of 100-200 nm, which is a polyhedral morphology. The synthesized LiNi0.03Mg0.10Mn1.87O4 has good electrochemical performance with initial discharge capacity of 107.6 mAh.g-1 at 1 C, and the first discharge capacity of 10 C is 68.7 mAh.g-1. The initial discharge capacity is 103.7 mAh?g-1 at a high temperature of 55℃. CV and EIS tests show that the LiNi0.03Mg0.10Mn1.87O4 has a large lithium ion diffusion coefficient of 1.038×10-11 cm2.s-1 and a small activation energy of 32.69 kJ.mol-1. The material after 1000 cycles shows that the crystal structure and particle morphology are basically unchanged, doping appropriate amounts of Ni and Mg ions can effectively improve the capacity attenuation and structural stability of the spinel LiMn2O4, thereby suppressing the Jahn-Teller effect.
作者单位E-mail
于月 云南民族大学 1768170101@qq.com 
向明武 云南民族大学 xmwbboy@163.com 
白红丽 云南民族大学 bhl0873@163.com 
刘晓芳 云南民族大学
 
xiaofangliu2010@163.com 
郭俊明 云南民族大学 guojunming@tsinghua.org.cn 
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