共沉淀-微波法制备高密度Li_(0.95)Na_(0.05)FePO_4及其性能研究  

High-density Li_(0.95)Na_(0.05)FePO_4 anode material synthesized by coprecipitation and microwave heating

作　　者：李军[1] 陶熏[1] 黄际伟[1] 朱建新[1] 李庆彪[1] 

机构地区：[1]广东工业大学轻工化工学院,广州510006

出　　处：《化工新型材料》2014年第7期62-64,共3页New Chemical Materials

基　　金：国家自然科学基金(21206019);广东省科技计划(2012B050100010);广州市科技计划(2011Y1-00010)

摘　　要：采用共沉淀法制备了球形前驱体,并以此前驱体应用微波加热制备了高密度Li0.95Na0.05FePO4正极材料。通过扫描电子显微镜(SEM)、X射线衍射(XRD)、循环伏安(CV)、恒电流充放电和振实密度测定等方法对材料的结构、表观形貌、电化学性能及振实密度进行了测试。结果表明:样品具有比较规则的球形或类球形的形貌及单一的橄榄石型晶体结构,以Na掺杂的Li0.95Na0.05FePO4具有优良的性能,振实密度达1.63g/cm3,在室温下分别以0.2C、1C和2C的电流密度充放电,首次放电比容量分别为164.2mAh/g、151.5mAh/g和130.5mAh/g。High-density Li0.95 Na0.05 FePO4 anode material was synthesized through microwave heating, using a spherical sample prepared by coprecipitation method as precursor. The morphology, structure, electrochemical performance and the tap density of the materials were characterized by scanning electron microscope（SEM）, x ray diffraction（XRD）, cy clic voltammetry（CV）,constant current charge discharge experiment and the tap density measurement. The results indica ted that the samples had rule spherical or similar spherical morphology and simple pure olive-type phase. The Na doped Li0. 95 Na0. 05 FePO4 material showed excellent performance with tap density of 1.63g/cma. At room temperature, its initial discharge capacities reached 164.2 mAh/g, 151.5mAh/g, 130.5mAh/g at 0.2C, 1 C, 2C current rates, respectively.

关 键 词：LIFEPO4 共沉淀 微波 锂离子电池 

分 类 号：TM912[电气工程—电力电子与电力传动]