两步法制备镍掺杂磷酸铁锂/石墨烯复合材料  

Preparation of Ni-doped LiFePO_4/graphene composite via two-step method

作　　者：舒叶[1] 刘锐[1] 张胤[1] 马晓华[1] 

机构地区：[1]复旦大学材料科学系,上海200433

出　　处：《电池》2011年第6期301-303,共3页Battery Bimonthly

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LiFe0.95Ni0.05PO4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5.0C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 LiFe0.95 Ni0.05PO4 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 LiFe0.95 Ni0.05 PO4/graphene composite was 147.2 mAh/g and 89.5 mAh/g, respectively, there were no obvious discharge capacity fading after 20 cycles.

关 键 词：磷酸铁锂(LiFePO4) 复合改性 石墨烯 掺杂 

分 类 号：TM912.9[电气工程—电力电子与电力传动]