| LiMn2O4表面包覆Li4Ti5O12的制备及倍率特性 |
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| 引用本文： | 刘东强,吁霁,孙玉恒,何泽珍,刘兴泉. LiMn2O4表面包覆Li4Ti5O12的制备及倍率特性[J]. 无机化学学报, 2007, 23(1): 41-45 |
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| 作者姓名： | 刘东强 吁霁 孙玉恒 何泽珍 刘兴泉 |
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| 作者单位： | 1. 中国科学院成都有机化学研究所,成都,610041;中国科学院研究生院,北京,100039
2. 中国科学院成都有机化学研究所,成都,610041;成都理工大学材料与化学化工学院,成都,610059 |
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| 基金项目： | 中国科学院"西部之光"联合学者基金 |
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| 摘 要： | 采用固相法合成了尖晶石型LiMn2O4，并通过溶胶-凝胶法制备了不同物质的量的百分比含量Li4Ti5O12包覆的正极材料。X-射线衍射和扫描电镜结果表明，Li4Ti5O12微粒包覆在LiMn2O4的表面没有产生晶体结构的变化。实验电池在室温下，以1C，2C和5C倍率作充放电循环测试；结果表明，与未包覆的LiMn2O4相比，表面包覆Li4Ti5O12微粒的正极材料在高倍率下具有更好的循环稳定性。
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| 关 键 词： | 尖晶石型LiMn2O4； 表面改性； Li4Ti5O12微粒； 倍率特性 |
| 文章编号： | 1001-4861(2007)01-0041-05 |
| 修稿时间： | 2006-06-20 |
Preparation and Rate Property of Li4Ti5O12-coated LiMn2O4 for Lithium Ion Battery |
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| LIU Dong-Qiang,YU Ji,SUN Yu-Heng,HE Ze-Zhen and LIU Xing-Quan. Preparation and Rate Property of Li4Ti5O12-coated LiMn2O4 for Lithium Ion Battery[J]. Chinese Journal of Inorganic Chemistry, 2007, 23(1): 41-45 |
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| Authors: | LIU Dong-Qiang YU Ji SUN Yu-Heng HE Ze-Zhen LIU Xing-Quan |
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| Affiliation: | Chengdu Institute of Organic Chemistry, Chinese Academy of Sciences, Chengdu 610041;Graduate School of Chinese Academy of Sciences, Beijing 100039,Chengdu Institute of Organic Chemistry, Chinese Academy of Sciences, Chengdu 610041;Graduate School of Chinese Academy of Sciences, Beijing 100039,Chengdu Institute of Organic Chemistry, Chinese Academy of Sciences, Chengdu 610041;Graduate School of Chinese Academy of Sciences, Beijing 100039,Chengdu Institute of Organic Chemistry, Chinese Academy of Sciences, Chengdu 610041;College of Materials and Chemistry & Chemical Engineering, Chengdu University of Technology, Chengdu 610059 and Chengdu Institute of Organic Chemistry, Chinese Academy of Sciences, Chengdu 610041;College of Materials and Chemistry & Chemical Engineering, Chengdu University of Technology, Chengdu 610059 |
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| Abstract: | Spinel LiMn2O4 was prepared by solid-state reaction and coated with different molar ratios of Li4Ti5O12 particles via sol-gel method. The unmodified and surface-modified LiMn2O4 were characterized by XRD and SEM. The results suggest that the Li4Ti5O12 particles have been encapsulated on the surface of the LiMn2O4 without any crystal structural change. To investigate the rate capability of the prepared materials, the experimental batteries were performed under a current rate of 1C, 2C and 5C, respectively, at ambient temperature. The electrochemical results reveal that the Li4Ti5O12-coated LiMn2O4 materials show excellent rate stability compared to the uncoated spinel, especially under 5C rate. |
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| Keywords: | spinel LiMn2O4 surface modification Li4Ti5O12 coating high-rate performance |
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