【作者】 吴肇聪； 黄瑞安； 周晓玲； 杨斌； 戴永年；

【Author】 WU Zhao-cong,HUANG Rui-an,ZHOU Xiao-ling,Yang Bin,DAI Yong-nian (National Engineering Laboratory for Vacuum Metallurgy,Faculty of Metallurgical and Energy Engineering, Kunming University of Science and Technology,Kunming 650093,China)

【机构】 昆明理工大学冶金与能源工程学院真空冶金国家工程实验室；

【摘要】 以CH₃COOLi·2H₂O、FeCl₃·6H₂O、NH₄H₂PO₄、蔗糖为原料,聚乙二醇（PEG）为表面活性剂.通过溶胶-凝胶法合成了LiFePO₄。利用X射线衍射（XRD）,扫描电镜（SEM）,比表面测试仪等对材料进行了表征,并对电化学性能进行了测试,与固相法合成的LiFePO₄进行了对比。研究表明溶胶-凝胶法合成的材料具有疏松的介孔结构,比表面积高达48.69m²/g,孔分布均匀。该材料以0.2、1、5、10C的倍率放电,比容量达到143.8、133.1、124.1、117.0 mAh/g;1C循环100次后,容量保持率为99.2%,具有比固相法合成的材料更优良的电化学性能。更多还原

【Abstract】 Mesoporous LiFePO₄ was synthesized through sol-gel approach by employing CH₃COOLi·2H₂O, FeCl₃·6H₂O,NH₄ H₂PO₄,sucrose as raw materials,PEG as a surfactant.The sample was characterized by X- ray diffraction（XRD）,scanning electron microscope（SEM） and N2-adsorption/desorption isotherms（BET）.Its electrochemical performance was investigated and compared with LiFePO₄ synthesized by solid state approach. The results indicated that the material synthesized through sol-gel approach has loosely mesoporous structure with homogenous pore distribution.The specific surface area is high up to 48.69m²/g.The material exhibits better electrochemical performance than the material synthesized by solid state approach.Under discharge rates of 0.2,1,5,10C,the specific discharge capacity reaches up to 143.8,133.1,124.1,117.0mAh/g,respectively. It has good capacity retention of 99.2%after 100 cycles.更多还原