A porous spherical aggregation of Li₄Mn₅O₁₂ nanorods and its electrochemical performance

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• 作者：Yan Zhao ; Qiongyu Lai ; Yanjing Hao ; Hongmei Zeng ; Hongyan Chu ; Zhien Lin
• 关键词：(NH₄)₂S₂O₈ ; Li₄Mn₅O₁₂ ; Porous material ; Spherical aggregation ; Capacitance performance
• 刊名：Journal of Power Sources
• 出版年：2010
• 出版时间：1 July 2010
• 年：2010
• 卷：195
• 期：13
• 页码：4400-4405
• 全文大小：1049 K

文摘

A porous spherical aggregation of Li₄Mn₅O₁₂ nanorods with the particle size of 3 μm is prepared by oxidizing LiMn₂O₄ powder with (NH₄)₂S₂O₈ under hydrothermal conditions. The result displays that concentration of (NH₄)₂S₂O₈ plays a key role in forming the porous spherical aggregation and the optimal concentration of oxidant is found to be 1.5 mol L⁻¹. The mechanism for the formation of the porous spherical aggregation is proposed. The electrochemical capacitance performance is tested by cyclic voltammetry, electrochemical impedance spectroscopy and galvanostatic charge/discharge. The porous spherical aggregation exhibits a good electrochemical performance. It could deliver 375 F g⁻¹ within potential range 0–1.4 V at a scan rate of 5 mV s⁻¹ in 1 mol L⁻¹ Li₂SO₄ and the value is cut down to less than 0.024 F g⁻¹ per cycling period in 1000 cycles.