碳包覆磷酸亚铁锂/石墨烯复合结构的制备及其电化学性能  

Synthesis and electrochemical properties of carbon-coated LiFePO_4/graphene nanocomposite

作　　者：黄帅[1] 张纪伟[1] 张经纬[1] 余来贵[1] 张平余[1] 

机构地区：[1]河南大学纳米杂化材料应用技术国家地方联合工程中心,河南开封475004

出　　处：《化学研究》2016年第2期165-168,共4页Chemical Research

基　　金：国家自然科学基金(21271063)

摘　　要：通过简单的水热和气相沉积法合成了碳包覆磷酸亚铁锂/石墨烯复合材料,通过XRD,SEM,TEM等对其形貌进行了表征,并将其用作锂离子电池正极材料进行电化学性能表征,结果表明:碳包覆磷酸亚铁锂/石墨烯复合材料即使在10C的倍率下仍有115mAh·g^(-1)的容量,同时在10C循环300次,容量保持率为82%.其优异的倍率和循环性能归因于沉积碳、石墨烯以及磷酸亚铁锂之间层层叠加的独特三维导电结构.Carbon-coated LiFePO4/graphene composite was prepared through a simple hydrothermal and the following chemical vapor deposition process.It was characterized by X-ray diffraction,scanning electron microscope and transmission electron microscope.It was found by electrochemical test that carbon-coated LiFePO4/graphene exhibited a capacity of 115 mAh·g^-1 at 10 C,meanwhile,it has a capacity retention of 82% after 300 cycles at 10 C.The excellent rate and cycle performance can be attribute to special 3D conductive structure that is stacked by graphene,deposited carbon and LiFePO4.

关 键 词：LIFEPO4 正极材料 锂离子电池 电化学性能 

分 类 号：O646[理学—物理化学]