两步法制备镍掺杂磷酸铁锂/石墨烯复合材料

摘要

用两步法制备掺杂Ni的磷酸铁锂(LiFePO4)/石墨烯复合材料.XRD、SEM和TEM等方法对产物的分析表明:橄榄石型LiFe0.95 Ni0.05 PO4颗粒的粒径为200～800 nm.循环伏安和恒流充放电测试结果表明:以0.1C和5.0 C的电流在2.5～4.2 V充电,制备的LiFe0.95Ni0.05PO4/石墨烯复合材料的首次放电比容量分别为147.2 mAh/g和89.5 mAh/g,循环20次,放电容量均无明显的衰减.%Ni doped lithium iron phosphate (LiFePO4)/graphene composite was prepared via two-step method. The analyses of XRD,SEM and TEM methods to the product showed the particle size of olivine-type LiFe0.95Ni0.05PO4 was 200～800 nm.The results of cyclic voltammetry and galvanostatic charge-discharge tests showed that when charged-discharged in 2.5 - 4.2 V with the current of 0.1 C and 5.0 C, the initial specific discharge capacity of prepared LiFeo 95Ni0.05PO4/graphene composite was 147.2 mAh/g and 89.5 mAh/g,respectively, there were no obvious discharge capacity fading after 20 cycles.