| 锌掺杂正极材料尖晶石LiMn_2O_4的制备及电化学性能 |
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| 引用本文： | 崔萍,贾志杰,李兰英,贺婷. 锌掺杂正极材料尖晶石LiMn_2O_4的制备及电化学性能[J]. 功能材料, 2011, 0(S5) |
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| 作者姓名： | 崔萍 贾志杰 李兰英 贺婷 |
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| 作者单位： | 华中师范大学物理科学与技术学院纳米科技所; |
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| 基金项目： | 湖北省自然科学基金资助项目(2009CDZ037) |
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| 摘 要： | 为改善锂离子电池正极材料LiMn2O4的电化学循环性能,以乙酸锂、乙酸锰和乙酸锌为原料,采用固相法制备了LiMn2-xZnxO4(x=0.02、0.04、0.06),并与未掺杂的LiMn2O4进行性能比较。X射线衍射(XRD)和扫描电子显微镜(SEM)分析表明所制备的LiMn2-xZnxO4具有与LiMn2O4同样的尖晶石结构,锌的掺入细化了尖晶石颗粒,增强了Li+在固相中的扩散能力。电化学测试结果显示锌掺杂能抑制LiMn2O4的电化学容量衰减现象,使其循环性能得到显著提高。其中LiMn1.96Zn0.04O4表现出最佳的循环性能,循环20次后放电容量可保持在106.6mAh/g。
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| 关 键 词： | 正极材料 锰酸锂 掺杂 交流阻抗 |
Preparation and electrochemical properties of Zn-doped LiMn_2O_4 |
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| CUI Ping,JIA Zhi-jie,LI Lan-ying,HE Ting. Preparation and electrochemical properties of Zn-doped LiMn_2O_4[J]. Journal of Functional Materials, 2011, 0(S5) |
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| Authors: | CUI Ping JIA Zhi-jie LI Lan-ying HE Ting |
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| Affiliation: | CUI Ping,JIA Zhi-jie,LI Lan-ying,HE Ting(Center of Nano-Science and Technology,Department of Physics,Central China Normal University,Wuhan 430079,China) |
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| Abstract: | In order to solve the problem of capacity fading of LiMn2O4 cathode material,LiMn2-xZnxO4 samples were prepared via solid-state reaction method with CH3COOLi,(CH3COO)2Mn and(CH3COO)2Zn as raw materials and their properties were compared with those of LiMn2O4.X-ray diffraction and scanning electron microscopy analysis indicate that the as-prepared LiMn2-xZnxO4 samples have the same cubic spinel structure as LiMn2O4 sample.The Zn-doping diminishes the size of particles,which is advantageous for Li+ ions trans... |
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| Keywords: | cathode materials lithium manganese oxide doping AC impedence |
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