| 尖晶石型LiMn2O4的制备及超级电容性能研究 |
| Preparation and Supercapacitor Performances of Spinel LiMn2O4 |
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| 摘要: 采用高温固相法制备LiMn2O4。X射线衍射结果表明800 ℃下得到尖晶石型LiMn2O4。利用恒流充放电、循环伏安和交流阻抗等研究了LiMn2O4电极材料在2 mol·L-1 (NH4)2SO4溶液中的超级电容性能。循环伏安测试结果表明LiMn2O4电极材料在0～1 V电位窗口范围内具有较好的方形特征；恒流充放电结果表明充放电曲线呈现出较规整的三角形对称分布，放电曲线呈直线关系，5 mA·cm-2下的放电比容量为141 F·g-1，具有较高的充放电效率，循环性能稳定；交流阻抗结果也显示LiMn2O4电极材料在2 mol·L-1 (NH4)2SO4中具有典型的电容阻抗特性。 |
| 关键词: LiMn2O4 超级电容器 高温固相法 |
| 基金项目: |
| Abstract: LiMn2O4 was synthesized by high temperature solid-state reaction. Results of X-ray diffraction show that spinel LiMn2O4 powder is obtained at 800 ℃. The supercapacitive performances of LiMn2O4 electrode materials were studied in terms of the charge-discharge curves, cyclic voltammetry and alternating current (AC) impedance in 2 mol·L-1(NH4)2SO4 solution. The results of cyclic voltammetric curves show that LiMn2O4 represents rectangular shape performance in the potential range of 0～1 V. The charge-discharge curves are linear and represent regularly symmetrical triangle, the specific capacity reaches 141 F·g-1 at 5 mA·cm-2. The electrode exhibits excellent charge-discharge efficiency and stability. The results of AC impedance testing also show that LiMn2O4 electrode has typical capacitance impedance performance. |
| Keywords: LiMn2O4 supercapacitor high temperature solid-state reaction |
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| 薛云,陈野,张密林.尖晶石型LiMn2O4的制备及超级电容性能研究[J].无机化学学报,2007,23(1):109-112. |
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