水热法制备高密度超细磷酸铁锂多晶粉  

Hydrothermal synthesis of ultra-fine lithium iron phosphate powders with high tap densities

作　　者：吴林君[1] 张家新[1] 管道安[1] 李婕[2] 钱琼丽[2] 

机构地区：[1]中国船舶重工集团公司第712研究所,湖北武汉430064 [2]武汉工程大学材料科学与工程学院,湖北武汉430074

出　　处：《武汉工程大学学报》2012年第9期26-29,33,共5页Journal of Wuhan Institute of Technology

摘　　要：分别采用两种不同锂盐与自制的磷酸亚铁铵(NH4FePO4.H2O)反应,通过水热法制备了高密度超细磷酸铁锂(LiFePO4)多晶粉,使用X射线衍射(XRD)、红外光谱(FTIR)和扫描电子显微镜(SEM)表征了磷酸亚铁铵和磷酸铁锂多晶粉,磷酸铁锂晶粒分别呈立方状和六方柱状,粒径约为0.2和0.3μm,振实密度都在1.70 g/cm3以上,采用0.1C进行充放电,比容量分别达到144.8 mA.h/g和142.3 mA.h/g,并且具有较好的循环性能.Polycrystalline lithium iron phosphate （LiFePO4 ） powders with high tap densities were prepared by hydrothermal method using self-made ferrous ammonium phosphate （NH4FePO4 ·H2O） and lithium salts. The phosphates were characterized by X-ray diffraction （ XRD）, fourier transform infrared spectroscopy （FTIR） and scanning electron microscopy （SEM）. The results show that the resulted lithium iron phosphate crystallites have cubic and bar shapes with average sizes of about 0. 2 and 0. 3 μm respectively, tap densities are above 1.70 g/cmz. The products exhibit high reversible specific capacities of 144.8 mA · h/g and 142.3 mA ·h/g respectively at 0.1 C with excellent cycling performance.

关 键 词：磷酸铁锂 磷酸亚铁铵 水热法 正极材料 

分 类 号：O614.111[理学—无机化学]