| Li类质同象替代对LiMn_2O_4结构及电化学性能的影响 |
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| 引用本文： | 孙永明,何涌,章鹏.Li类质同象替代对LiMn_2O_4结构及电化学性能的影响[J].电源技术,2010,34(3). |
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| 作者姓名： | 孙永明 何涌 章鹏 |
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| 作者单位： | 中同地质大学,材料科学与化学工程学院,湖北,武汉,430074 |
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| 摘 要： | 以燃烧法按不同Li/Mn比制备了一系列尖晶石LiMn2O4正极材料,并对其晶体结构及电化学性能进行了研究。根据样品的化学成分、晶胞参数、理论密度及真密度计算了它们的晶体化学式;发现随着Li/Mn比增加,锰酸锂材料晶体结构中的金属离子缺陷及氧缺陷增加。充放电循环测试结果表明:晶体结构中离子缺陷少的材料在低倍率放电时表现出相对高的比容量和差的循环性能;适量Li掺杂导致晶体结构中含一定离子缺陷的材料在高倍率放电时表现出较高的比容量和优异的循环性能。
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| 关 键 词： | LiMn2O4 晶体结构 缺陷 比容量 循环性能 |
Effect of isomorphism of Li on crystal structure and electrochemical performance of LiMn2O4 |
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| SUN Yong-ming,HE Yong,ZHANG Peng.Effect of isomorphism of Li on crystal structure and electrochemical performance of LiMn2O4[J].Chinese Journal of Power Sources,2010,34(3). |
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| Authors: | SUN Yong-ming HE Yong ZHANG Peng |
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| Affiliation: | College of Materials Science and Chemistry Engineering;China University of Geosciences;Wuhan Hubei 430074;China |
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| Abstract: | The crystal structure and electrochemical performance of spinel LiMn2O4 samples synthesized by combustion method with different ratios of Li/Mn were investigated.The crystal formulas were studied with their chemical compositions,lattice parameters,theoretical densities and real densities.It is concluded that both the metal cation defect and oxygen defect increased with the ratio rise of Li/Mn in the crystal structure of spinel LiMn2O4.The rusult shows that the sample with less ion defect in its crystal stru... |
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| Keywords: | LiMn2O4 crystal structure defect capacity cyclic performance |
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