| Al掺杂对尖晶石型LiMn2O4结构及循环性能的影响 |
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| 引用本文： | 杨丽娟,金头男,李于华.Al掺杂对尖晶石型LiMn2O4结构及循环性能的影响[J].盐湖研究,2006,14(3):29-33. |
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| 作者姓名： | 杨丽娟 金头男 李于华 |
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| 作者单位： | 北京工业大学材料科学与工程学院,北京,100022 |
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| 基金项目： | 北京市教委科技发展计划项目 |
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| 摘 要： | 用柠檬酸作为螯合物的载体,采用溶胶-凝胶法合成了Al3+掺杂的锂离子电池正极材料LiAlxMn2-xO4,并用XRD、SEM等多种测试手段研究了不同掺杂铝量对粉体形貌、晶体结构的影响。结果表明,800℃烧结可获得单一尖晶石结构的物相。随着Al3+掺入量的增加,LiAlxMn2-xO4的晶格常数变小,晶格更趋于完整,有利于抑制因锂的反复脱嵌而造成结构的破坏。实验表明,当掺Al量为0.05时,首次放电容量为103.8 mAh/g,25次循环后容量还有100.6 mAh/g,容量衰减仅为3.08%。该正极材料具备高的容量和优异的循环性能。
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| 关 键 词： | 溶胶-凝胶法 LiMn2O4 掺杂 尖晶石 |
| 文章编号： | 1008-858X(2006)03-0029-05 |
| 修稿时间： | 2006年3月21日 |
Effect of Al Doping on the Structure and Capability of LiMn2O4 Spinel Synthesized by Sol-gel Method |
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| YANG Li-juan,JIN Tou-nan,LI Yu-hua.Effect of Al Doping on the Structure and Capability of LiMn2O4 Spinel Synthesized by Sol-gel Method[J].Journal of Salt Lake Research,2006,14(3):29-33. |
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| Authors: | YANG Li-juan JIN Tou-nan LI Yu-hua |
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| Abstract: | Spinel LiMn_2O_4 and Al-substituted spinel LiAl_xMn_(2-x)O_4(x=0.05,0.15) were synthesized by a sol-gel method using citric acid as the chelating agent.Their morphologies and microstructure were examined by powder XRD analysis and SEM.The patterns of XRD suggested that when x is not very high,LiAl_xMn_(2-x)O_4 is still of spinel structure.The lattice constant decreased with increasing x.Highly crystallized LiAl_xMn_(2-x)O_4 was prepared by calcination at 800℃.When x=0.05,the capacity is(103.8 mAh/g) for the first cycle,and(100.6 mAh/g) after 25 cycles,only a 3.08% decline.Therefore,the Al-doped material has better capacity and cycle performances. |
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| Keywords: | LiMn2O4 |
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