| MnO2预处理对LiMn2O4性能的影响研究 |
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| 引用本文： | 吴显明,陈上,刘金练,麦发任,李长安. MnO2预处理对LiMn2O4性能的影响研究[J]. 人工晶体学报, 2011, 40(6): 1531-1535 |
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| 作者姓名： | 吴显明 陈上 刘金练 麦发任 李长安 |
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| 作者单位： | 吉首大学化学化工学院,吉首416000;湘两自治州矿产与新材料技术创新服务中心,吉首416000;吉首大学化学化工学院,吉首,416000 |
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| 基金项目： | 国家自然科学基金(20873054) |
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| 摘 要： | 以经过硝酸预处理的电解二氧化锰为原料制备尖晶石LiMn2O4,采用X射线衍射、扫描电子显微镜、恒电流充放电对LiMn2O4进行物相、形貌及电化学性质分析.结果表明:采用经硝酸预处理MnO2制备的LiMn2O4粉末X射线衍射峰比未经硝酸预处理MnO2制备的LiMn2O4强度大,峰更尖锐,结晶性更好,粉末颗粒均匀,表面光滑,无团聚现象.经预处理MnO2制备的LiMn2O4在0.2C倍率放电时的比容量为121.1 mAh/g,高于未经预处理MnO2制备的LiMn2O4放电比容量116.7mAh/g,在室温或高温(55℃)不同充放电倍率循环时的容量保持率均高于未经预处理MnO2制备的LiMn2O4.
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| 关 键 词： | 锂离子电池 正极材料 锰酸锂, |
Influence of MnO_2 Pretreatment on the Performance of LiMn_2O_4 |
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| WU Xian-ming , CHEN Shang , LIU Jin-lian , MAI Fa-ren , LI Chang-an. Influence of MnO_2 Pretreatment on the Performance of LiMn_2O_4[J]. Journal of Synthetic Crystals, 2011, 40(6): 1531-1535 |
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| Authors: | WU Xian-ming CHEN Shang LIU Jin-lian MAI Fa-ren LI Chang-an |
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| Affiliation: | WU Xian-ming1,2,CHEN Shang1,LIU Jin-lian1,MAI Fa-ren1,LI Chang-an1 (1.College of Chemistry and Chemical Engineering,Jishou University,Jishou 416000,China,2.Xiangxi Ores and New Materials Development and Service Center,China) |
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| Abstract: | Spinel LiMn2O4 powders were prepared by elctrolytic MnO2 preconditioning by nitric acid.The phase identification,surface morphology,and electrochemical properties of the powders were characterized by X-ray diffraction,scanning electron microscopy,and galvanostatic charge-discharge experiments.The results show that LiMn2O4 powders prepared by preconditioning MnO2 have better crystallinity than the one prepared by MnO2.LiMn2O4 powders prepared by preconditioning MnO2 are homogeneous,smooth and without agglome... |
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| Keywords: | lithium ion battery cathode materials lithium manganese oxide |
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