唐定国,李昱霏,杜康,李昱霖,徐策,李襄宏.水热法合成o-LiMnO2纳米棒及其电化学性能研究[J].中南民族大学学报自然科学版,2020,39(6):564-568
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 their electrochemical performance
  
DOI:10.12130/znmdzk.20200602
中文关键词: 水热法  锰酸锂  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
唐定国 中南民族大学 化学与材料科学学院催化转化与能源材料化学教育部重点实验室武汉430074 
李昱霏 中南民族大学 化学与材料科学学院催化转化与能源材料化学教育部重点实验室武汉430074 
杜康 中南民族大学 化学与材料科学学院催化转化与能源材料化学教育部重点实验室武汉430074 
李昱霖 中南民族大学 化学与材料科学学院催化转化与能源材料化学教育部重点实验室武汉430074 
徐策 中南民族大学 化学与材料科学学院催化转化与能源材料化学教育部重点实验室武汉430074 
李襄宏 中南民族大学 化学与材料科学学院催化转化与能源材料化学教育部重点实验室武汉430074 
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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:锂锰物质的量之比为12︰1、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-1,经30 周充放电循环后放电容量保持率为66%.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 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 subsequent hydrothermal reaction. The structure and morphology of the product were characterized by X-ray diffraction (XRD) and scanning electron microscope (SEM), and the electrochemical performances of the product were investigated by charge-discharge cycling tests. The results showed that the pure phase o-LiMnO2 could be obtained when the molar ratio between lithium and manganese was 12︰1, the reaction temperature was 100 ℃ and the reaction time was 15 h. The initial discharge capacity of the pure product is 176 mAh,g-1, and 66% was reserved after thirty charge-discharge cycles. The pure phase o-LiMnO2 demonstrated higher discharge capacity than the product containing Li2MnO3 impurity, although the latter showed better cycle stability.
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