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| 1 | Structure and electrochemical properties of LiLa_xMn_(2-x)O_4 cathode material by the ultrasonic-assisted sol-gel method显示文摘Powders of spinel LiLaxMn2-xO4 were successfully synthesized by the ultrasonic-assisted sol-gel(UASG) method. The structure and properties of LiLaxMn2-xO4 were examined by X-ray diffraction(XRD) ,Fourier transform infrared(FT-IR) spectroscopy,scanning electronic microscopy(SEM) ,galvanostatic charge-discharge test,and cyclic voltammetry(CV) . XRD results show that the La3+ can partially replace Mn3+ in the spinel and the doped materials with La3+ have a larger lattice constant compared with pristine LiMn2O4. FT-IR indicates that the absorption peak of Mn3+-O and Mn4+-O bonds has a red and blue shift with the increase of doping lanthanum in LiLaxMn2-xO4,respectively. The charge-discharge test exhibits that the initial discharge capacity of LiLaxMn2-xO4 drops off,and the capacity retention increases gradually at C/5 discharge rate with the increase of doping lanthanum,and LiLa0.01Mn1.99O4 has a higher discharge capacity and a better cycling performance at 1C discharge rate. CV reveals that the dop-ing La3+ is beneficial to the reversible extraction and intercalation of Li+ ions. | Ting-feng Yi Yan-rong Zhu Xin-guo Hu | 2009 | International Journal of Minerals,Metallurgy and Materials2009，16，1： | 2 |
| 2 | LiMn2O4/Li4Ti5O12复合材料的制备与电化学性能显示文摘以LiMn2O4、醋酸锂和钛酸四丁酯为原料,乙醇为溶剂,采用原位复合法制备LiMn2O4/Li4Ti5O12复合材料。采用X射线衍射分析、红外光谱、扫描电镜和电化学测试等手段对复合材料进行表征。结果表明,在LiMn2O4/Li4Ti5O12复合材料中晶态的LiMn2O4表面被无定形结构的Li4Ti5O12包覆,但Li4Ti5O12的存在并没有改变LiMn2O4的晶体结构。由于Li4Ti5O12的包覆,LiMn2O4的倍率性能和高温性能都得到显著提高:室温下2.0C放电时20次循环后LiMn2O4/Li4Ti5O12复合材料的可逆容量达到108.4mA·h/g,平均每次循环的容量损失只有0.053%;而55℃1.0C放电时,经60次循环后LiMn2O4/Li4Ti5O12的放电容量为109.9mA·h/g,平均每次循环的容量损失为0.036%。 | 何则强 熊利芝 吴显明 陈上 黄可龙 | 2008 | 中国有色金属学报2008，18，E01： | 1 |
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