水热法合成o-LiMnO2纳米棒及其电化学性能研究
Hydrothermal Synthesis of o-LiMnO2 Nanorods and Electrochemical Performance
投稿时间:2020-01-10  修订日期:2020-03-05
DOI:
中文关键词: 水热法  o-LiMnO2  前驱体  纳米棒  电化学性能
英文关键词: hydrothermal reaction  o-LiMnO2  precursor  nanorod  electrochemical performance
基金项目:国家自然科学基金资助项目(21971258),中央高校基本科研业务费专项资金项目(CZY18009)
作者单位E-mail
唐定国 中南民族大学 tdgpku@mail.scuec.edu.cn 
李昱霏 中南民族大学  
杜康 中南民族大学  
李昱霖 中南民族大学  
徐策 中南民族大学  
李襄宏 中南民族大学  
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中文摘要:
      以KMnO4为锰源、乙醇为还原剂,采用水热法首先制备前驱体MnOOH,再以LiOH.H2O为锂源经二次水热反应制备了纯相的正交结构层状锰酸锂(o-LiMnO2)纳米棒。采用X射线衍射(XRD)、扫描电子显微镜(SEM)等对产物的结构和形貌进行表征,通过充放电测试考察产物的电化学性能。结果表明,锂锰比为12:1(物质的量之比)、反应温度为100 ℃、反应时间为15 h时,产物为纯相o-LiMnO2,其首次放电容量为176 mAh/g,经30周充放电循环后放电容量保持率为66%。研究还发现,纯相o-LiMnO2相对于含有Li2MnO3杂相的产物具有更高的放电容量,但后者循环稳定性较好。
英文摘要:
      Using KMnO4 as the manganese source and ethanol as the reducing agent, the precursor MnOOH was prepared by hydrothermal method. The as-prepared MnOOH reacted with LiOH.H2O to form pure phase orthogonal layered lithium manganese oxide o-LiMnO2 nanorods via hydrothermal reaction. The structure and morphology of the product were characterized by X-ray diffraction (XRD) and scanning electron microscope (SEM), and electrochemical performances of the product were investigated by charge-discharge cycling tests. The results show that the pure phase o-LiMnO2 can be obtained when the molar ratio between lithium and manganese, the reaction temperature and the reaction time is 12:1, 100oC and 15 h, respectively. The first discharge capacity of the pure product is 176 mAh/g, and the discharge capacity reserves 66% after thirty charge-discharge cycles. The study also finds that the pure phase o-LiMnO2 boasts a higher discharge capacity than the product containing the Li2MnO3 impurity although the latter shows a better cycle stability.
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