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以C2H2为碳源,Fe为催化剂,纳米FePO4为原料,采用催化化学气相沉积法(CCVD)合成多孔LiFePO4/C正极材料。经BET、SEM、CHON有机元素分析仪、XRD等手段对复合材料进行结构分析表征。结果表明,该复合材料具有连续贯通的三维导电网络结构,大的比表面积以及多重孔隙的类球形结构,含碳量为4.42%(质量分数),低于传统碳热还原法所制备的材料。电化学测试表明,该材料在0.1、1、5、10 C倍率下,放电比容量分别为147,141,126,110 m Ah·g-1,高倍率充放电性能大大提高,另外,该材料1 C循环80次后,放电比容量基本没有降低,显示了良好的循环稳定性能。
The porous LiFePO4 / C cathode material was synthesized by catalytic chemical vapor deposition (CCVD) using C2H2 as carbon source, Fe as catalyst and nano-FePO4 as raw material. The structures of the composites were characterized by BET, SEM, CHON, elemental analysis and XRD. The results show that the composite material has a continuous three-dimensional conductive network structure, a large specific surface area and a multiple-spheroid-like spherical structure with a carbon content of 4.42% (mass fraction), which is lower than that of a material prepared by the traditional carbothermal reduction method. The results of electrochemical tests showed that the specific discharge capacities of this material were 147, 141, 126 and 110 m Ah · g-1 at 0.1, 1, 5 and 10 C magnification, respectively. The charge-discharge performance at high magnification was greatly improved. , The discharge capacity of the basic did not reduce, showing a good cycle stability.