镁掺杂磷酸铁锂的碳热还原法制备及表征  

Carbothermic Reduction Preparation and Characterization of Mg-doped Lithium Iron Phosphate

作　　者：李超[1] 刘述平[1] 冯雪茹[1] 唐湘平[1] LI Chao;LIU Shu ping;FENG Xue ru;TANG Xiang ping(Institute of Multipurpose Utilization of Mineral Resources,CAGS,Chengdu G10041,China)

机构地区：[1]中国地质科学院矿产综合利用研究所,成都610041

出　　处：《有色金属（冶炼部分）》2018年第10期60-63,共4页Nonferrous Metals（Extractive Metallurgy)

基　　金：中国地质调查局地质调查项目(DD20160074)子项目(D1601.6.3)

摘　　要：采用沉淀法制备出磷酸铁,将其与碳酸锂、葡萄糖混合,并掺杂适量的镁,以碳热还原法制备出磷酸铁锂正极材料。制备的磷酸铁粉体D_(50)=2.94μm并呈正态分布。合成的镁掺杂磷酸铁锂颗粒呈类球形,D_(50)=2.80μm;不同镁掺杂量的磷酸铁锂XRD谱没有显著差别。掺杂后的LiFe_(1-x)Mg_xPO_4/C随着x值的增加,比容量有一定的上升。当x=0.01时,0.1C放电比容量为162mAh/g,1C放电比容量达到135mAh/g,循环性能优异。Ferric phosphate was prepared by precipitation method,and then mixed with lithium carbonate,glucose and magnesium source to prepare lithium iron phosphate by carbothermic reduction method.Particle size of ferric phosphate is normal distribution with D_（50） =2.94 μm.Mg-doped lithium iron phosphate particles have spherical shape with D_（50）=2.80μm.XRD patterns of synthesized lithium iron phosphate show no significant differences.Specific capacity of LiFe_（1-x）Mg_xPO_4/C rises with increase of value of x.Upon x=0.01,the discharge capacity of sample is 162 mAh/g at 0.1 Crate and 135 mAh/g at1 Crate respectively.Excellent cycle performance is presented.

关 键 词：沉淀法 碳热还原法 镁 磷酸铁锂 

分 类 号：TM912.9[电气工程—电力电子与电力传动]