Faculty of Applied Chemical Engineering, Chonnam National University, Gwang-ju 500-757, South Korea.
J Colloid Interface Sci. 2011 Mar 15;355(2):472-7. doi: 10.1016/j.jcis.2010.12.038. Epub 2010 Dec 16.
Size controlled, nanoparticulate Li(2)MnSiO(4) cathodes were successfully prepared by sol-gel route. Effects of calcination temperature and carbon content (adipic acid) were studied during synthesis process. EPR study was conducted to ensure the formation of phase through oxidation state of manganese. Microscopic pictures indicate spherical shape morphology of the synthesized Li(2)MnSiO(4) nanoparticles. Transmission electron microscopic pictures confirmed the presence of carbon coating on the surface of the particles. Further, the optimization has been performed based on phase purity and its battery performance. From the optimization, 700°C and 0.2 mol adipic acid (against total metal ion present in the compound) were found better conditions to achieve high performance material. The Li(2)MnSiO(4) nanoparticles prepared in the aforementioned conditions exhibited an initial discharge capacity of ~113 mAh g(-1) at room temperature in Li/1M LiPF(6) in EC:DMC/Li(2)MnSiO(4) cell configuration. All the Li(2)MnSiO(4) nanoparticles prepared at various conditions experienced the capacity fade during cycling.
通过溶胶-凝胶法成功制备了具有尺寸控制的纳米 Li(2)MnSiO(4) 正极材料。在合成过程中研究了煅烧温度和碳含量（己二酸）的影响。通过锰的氧化态进行电子顺磁共振（EPR）研究以确保相的形成。微观照片表明合成的 Li(2)MnSiO(4) 纳米颗粒具有球形形态。透射电子显微镜照片证实了颗粒表面存在碳涂层。进一步基于相纯度及其电池性能进行了优化。从优化结果来看，700°C 和 0.2 mol 己二酸（相对于化合物中存在的总金属离子）是获得高性能材料的更好条件。在上述条件下制备的 Li(2)MnSiO(4) 纳米颗粒在室温下在 Li/1M LiPF(6) 在 EC:DMC/Li(2)MnSiO(4) 电池配置中表现出约 113 mAh g(-1)的初始放电容量。在各种条件下制备的所有 Li(2)MnSiO(4) 纳米颗粒在循环过程中都经历了容量衰减。
