高性能可充式锂硒电池多孔分散碳球/硒复合物的合成与表征

摘要

为了探索锂硒电池中负载硒的合适材料,以间苯二酚-甲醛树脂作前驱体通过熔融-分散法制备多孔分散碳球/硒复合物.首先,通过将间苯二酚-甲醛树脂碳化,随后用氢氧化钾活化制备得到多孔分散碳球.对3种含有不同质量比的多孔碳球/硒复合物样品进行XRD、拉曼光谱、扫描电镜、BET比表面积法和元素图谱测试.结果表明,硒在复合物样品中含量的不同会形成不同的内部结构,硒在多孔分散碳球/硒复合物中的最佳含量为50％,这种复合物电极在0.2C的电流密度下经过100次循环表现出643.9 mA·h/g的高比容量.%In order to find the appropriate material to load selenium for higher performance of rechargeable Li-Se batteries,the resorcinol-formaldehyde resins derived monodisperse carbon spheres (RFCS)/Se composites were fabricated by the melting-diffusion method.The RFCS were obtained from initial carbonization of resorcinol-formaldehyde resins and subsequent KOH activation.Three kinds of samples of the RFCS/Se composites with different mass ratios were characterized by XRD,Raman spectroscopy,SEM,BET and EDS tests,which demonstrate that the samples with diverse mass fractions of selenium have distinct interior structure.The most suitable RFCS/Se composite is found to be the RFCS/Se-50 composite,which delivers a high reversible capacity of 643.9 mA.h/g after 100 cycles at current density of 0.2C.