| 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 |
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| 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) |
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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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