| LiMn_(1.8-x)Co_(0.2)Cr_xO_4的合成和电化学性能 |
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| 引用本文： | 林应斌,陈文,朱何丽,袁春燕,黄志高.LiMn_(1.8-x)Co_(0.2)Cr_xO_4的合成和电化学性能[J].福建师大福清分校学报,2009(Z1). |
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| 作者姓名： | 林应斌 陈文 朱何丽 袁春燕 黄志高 |
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| 作者单位： | 福建师范大学物理与光电信息科技学院,福建福州,350007 |
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| 基金项目： | 福建师范大学本科课外科技计划项目 |
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| 摘 要： | 以柠檬酸作为螯合剂,通过溶胶-凝胶法合成尖晶石型锂离子电池正极材料LiMn1.8-xCo0.2CrxO4并用XRI和SEM表征其微结构,利用电化学测试考察材料的电化学性能.测试结果表明,所合成的材料具有完整的尖晶石结构,Cr3+的掺入并不会导致材料相结构的变化,说明Cr3+(d3)以替代形式进入尖晶石结构并替代八面体骨架中的Mn3+(d3).Cr3+对Mn位的掺杂使材料主体结构得到了稳定且具有很好的充放电平台.
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| 关 键 词： | 正极材料 尖晶石结构 溶胶-凝胶 伏安特性 |
Sol-gel Synthesis and Electrochemical Properties of LiMn1.8-xCo0.2CrxO4 Cathode Material |
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| LIN Yingbin,CHEN Wen,ZHU Heli,YUAN Chunyan,HUANG Zhigao.Sol-gel Synthesis and Electrochemical Properties of LiMn1.8-xCo0.2CrxO4 Cathode Material[J].Journal of Fuqing Branch of Fujian Normal University,2009(Z1). |
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| Authors: | LIN Yingbin CHEN Wen ZHU Heli YUAN Chunyan HUANG Zhigao |
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| Institution: | LIN Yingbin,CHEN Wen,ZHU Heli,YUAN Chunyan,HUANG Zhigao) (School of Physics and Optoelectronic Technology,Fujian Normal University,Fuzhou 350007) |
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| Abstract: | Spinel LiMn1.8Co0.2O4 and LiMn1.2Co0.2Cr0.6O4 compounds were prepared through sol -gel method using citric acid as a chelating agent. The structural and electrochemical properties of cathode compounds were investigated by mean of X -ray diffraction,SEM,cyclic voltammetry,galvanostatic charge-discharge test and AC impedance spectra systematically. It is found that the high rate discharge capability of electrodes is distinctly improved by chromium doping,indicating that Cr oxidation stabilized the spinel stru... |
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| Keywords: | Cathode material Spinel structure Sol-gel Cyclic voltammetry |
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