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  • 許江楓, 李建玲, 李文生, 王新東. 電極活性材料Li4Ti5O12的制備及電化學性能[J]. 工程科學學報, 2007, 29(10): 1015-1018,1058. DOI: 10.13374/j.issn1001-053x.2007.10.004
    引用本文: 許江楓, 李建玲, 李文生, 王新東. 電極活性材料Li4Ti5O12的制備及電化學性能[J]. 工程科學學報, 2007, 29(10): 1015-1018,1058. DOI: 10.13374/j.issn1001-053x.2007.10.004
    XU Jiangfeng, LI Jianling, LI Wensheng, WANG Xindong. Preparation and electrochemical properties of Li4Ti5O12 as an electrode material[J]. Chinese Journal of Engineering, 2007, 29(10): 1015-1018,1058. DOI: 10.13374/j.issn1001-053x.2007.10.004
    Citation: XU Jiangfeng, LI Jianling, LI Wensheng, WANG Xindong. Preparation and electrochemical properties of Li4Ti5O12 as an electrode material[J]. Chinese Journal of Engineering, 2007, 29(10): 1015-1018,1058. DOI: 10.13374/j.issn1001-053x.2007.10.004

    電極活性材料Li4Ti5O12的制備及電化學性能

    Preparation and electrochemical properties of Li4Ti5O12 as an electrode material

    • 摘要: 以LiNO3和TiO2為初始反應物,固相法合成了Li4Ti5O12(M1).X射線衍射實驗結果表明,所得粉體為較純的尖晶石結構的Li4Ti5O12復合氧化物.Li4Ti5O12電極以35mA·g-1電流密度恒流充放電,首次放電容量達到170mAh·g-1,接近理論容量,首次充放電效率為92%.其在大電流密度下充放電性能良好,以175,350,875mA·g-1的電流密度放電,放電容量分別達到了151,140,115mAh·g-1;與傳統方法使用LiOH和TiO2固相合成的Li4Ti5O12(M2)加以比較,3個倍率下的放電容量分別提高了約5%,10%和26%.循環伏安曲線表明:M1電極電位極化小,可逆性好,電極電化學活性高;M1電極嵌入/脫出鋰后交流阻抗測試表明其電化學反應阻抗分別為16和20Ω.

       

      Abstract: Li4Ti5O12(M1) was obtained by solid reaction process with LiNO3 and TiO2 as reactants. XRD analysis indicates that the main phase of the produced powder is Li4Ti5O12 compound oxide with spinel structure. The initial discharge capacity of M1 at 35 mA·g-1 reaches 170 mAh·g-1, which is comparable to the theoretical capacity, and the first coulombic efficiency is 92%. M1 performs well when it charges and discharges with high current density, and the discharge capacities reach 151, 140 and 115 mAh·g-1 at 175, 350 and 875 mA·g-1, respectively. The discharge capacities of M1, comparing with that of ME prepared by conventional solid-state sintering of LiOH and TiO2, increase by 5%, 10% and 26% at 175, 350 and 875 mA·g-1, respectively. Cyclic voltammogram suggests that the electrode of M1 has low polarization, good reversibility and high electrochemical activity. The charge transfer resistances of M1 measured through AC impedance are 16 and 2012 after lithium insertion and extraction, respectively.

       

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