| 纳米LiCo_xMn_(2-x)O_4粉体的制备与电化学性能 |
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| 引用本文： | 蔡羽,赵胜利,文九巴,赵崇军. 纳米LiCo_xMn_(2-x)O_4粉体的制备与电化学性能[J]. 功能材料, 2009, 40(2) |
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| 作者姓名： | 蔡羽 赵胜利 文九巴 赵崇军 |
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| 作者单位： | 蔡羽,赵胜利,CAI Yu,ZHAO Sheng-li(河南科技大学,信息管理研究所,河南,洛阳,471003);文九巴,WEN Jiu-ba(河南科技大学,材料学院,河南,洛阳,471003);赵崇军,ZHAO Chong-jun(华东理工大学,材料学院,上海,200237) |
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| 基金项目： | 国家自然科学基金，河南科技大学人才科研基金 |
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| 摘 要： | 采用溶胶一凝胶法并结合热处理工艺制备LiCoxMn2-xO4粉体,结合热处理工艺制备Li-LiCoxMn2-xO4粉体.利用热重一差热分析、X射线衍射、透射电镜、充放电测试等方法对前驱体的热分解行为、粉体的结构、形貌及电化学性质进行了表征,同时研究了钴掺杂量对其结构和电化学性能的影响.结果表明,直接以聚丙烯酸(PAA)为螯合剂合成了稳定的溶胶和凝胶,进一步获得了粒径分布均匀、无团聚的尖晶石LiCoxMn2-xO4纳米粉体.随着钴掺杂量的增加,晶格常数、晶粒尺寸逐渐减小,晶格畸变逐渐增大,但对尖晶石结构影响较小;LiCoxMn2-xO4粉体的放电比容量随着x值增大略有降低,但循环性能得到明显的改善.在电流密度0.1mA/cm2、截止电压3.5～4.3V时,粒径约80hm的LiCo0.1Mn1.9O4粉体首次放电比容量达135mAh/g,20次循环后的稳定放电比容量为118mAh/g,且每次容量衰减低于0.2%,具有较好的电化学性能.
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| 关 键 词： | 纳米粉体 溶胶-凝胶 掺杂 |
Synthesis and electrochemical properties of LiCo_xMn_(2-x)O_4 nano-powder |
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| CAI Yu,ZHAO Sheng-li,WEN Jiu-ba,ZHAO Chong-jun. Synthesis and electrochemical properties of LiCo_xMn_(2-x)O_4 nano-powder[J]. Journal of Functional Materials, 2009, 40(2) |
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| Authors: | CAI Yu ZHAO Sheng-li WEN Jiu-ba ZHAO Chong-jun |
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| Affiliation: | 1.Institute of Information Management;Henan University of Science &Technology;Luoyang 471003;China;2.School of Materials Science &Engineering;3.School of Materials Science &East China University of Science &Shanghai 200237;China |
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| Abstract: | Spinel LiCoxMn2-xO4 powders were prepared via sol-gel combined with heating treatment process.The thermal decomposition behavior of gel precursor,structure,morphology and electrochemical properties of LiCoxMn2-xO4 powders were characterized by thermogravimetric/differential scanning calorimetry(TG-DSC),X-ray diffraction(XRD),transmission electron microscopy(TEM) and constant current charge/discharge technologies.The effect of Co-dopant on its structure and electrochemical properties was also investigated.Th... |
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| Keywords: | LiCoxMn2-Xo4 PAA |
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