Abstract: LiFePO₄/C cathode material was prepared from solid-state method using Fe₂O₃,LiH₂PO₄,black carbon and sugar as the starting materials.The synthesized material was characterized by means of X-ray diffraction (XRD),scanning electron microscope (SEM) and galvanostatic charge/discharge cycling.The results show that the products are single phases and all the peaks are indexable to the orthorhombic structure.The synthesized LiFePO₄/C exhibits an excellent electrochemical property with initial discharge specific capacity of 156.3 mAh/g and the discharge specific capacity of 157.7 mAh/g after 30 cycles in the voltage range 2.50~4.20V (versusLi+/Li) at a constant current density of 0.1 mA/cm².

Key words: Lithium-ion batteries,    , Cathode material,    , Solid-state method

摘要： 以Fe₂O₃,LiH₂PO₄,乙炔黑和蔗糖为原料,采用高温固相合成方法制备LiFePO₄/C复合正极材料。利用X射线衍射(XRD)、扫描电镜(SEM)和电化学测试等方法对合成材料的结构、形貌以及电化学性能进行表征。结果表明,合成材料为单一晶相正交晶系结构,在电压为2.50~4.20V (vs.Li+/Li),以0.1mA/cm² 电流密度下经恒电流充放电测试,其首次放电比容量为156.3mAh/g,经过30周充放电循环后放电比容量为157.7mAh/g,表现出较大的初始放电比容量和优异的循环性能。

关键词: 锂离子电池,    , 正极材料,    , 高温固相法