球形LiMnPO_(4)/C正极材料的喷雾干燥法制备及性能研究  

Preparation and properties of spherical LiMnPO_(4)/C cathode materials by spray drying method

作　　者：张凯[1] 江奥 Zhang Kai;Jiang Ao(Department of Architecture and Environmental Engineering,Sichuan Vocational Technical College,Suining 629000,China;College of Materials and Chemistry and Chemical Engineering,Chengdu University of Technology)

机构地区：[1]四川职业技术学院建筑与环境工程系,四川遂宁629000 [2]成都理工大学材料与化学化工学院

出　　处：《无机盐工业》2021年第1期54-58,共5页Inorganic Chemicals Industry

摘　　要：以氢氧化锂、乙酸锰、磷酸二氢铵和聚乙二醇为原料,采用一次喷雾干燥法制备了球形Li MnPO_(4)/C正极材料,并研究了煅烧温度对球形LiMnPO_(4)/C样品形貌、结构和电化学性能的影响。通过X射线衍射(XRD)和场发射扫描电镜(SEM)对其进行了结构和形貌的表征。结果表明,经700℃焙烧的LiMnPO4/C为橄榄石型结构,在SEM下呈规则的球形,由粒径约为50 nm的一维纳米颗粒堆积而成。该样品在室温0.1C倍率下首次放电比容量可达148 mA·h/g,循环80圈后的放电比容量依然在140 mA·h/g左右,容量保持率为94.6%。One-time spray-drying method was used to prepare spherical LiMnPO_(4)/C cathode materials with lithium hydroxide,manganese acetate,NH_(4)H_(2)PO_(4) and polyethylene glycol as raw materials.The effect of calcination temperature on the morphology,structure and electrochemical performance of spherical LiMnPO_(4)/C samples was studied.Its structure and morphology were characterized by X-ray diffraction(XRD)and field emission scanning electron microscopy(SEM).The morphology and prechemical properties of LiMnPO_(4)/C obtained after calcination at different temperatures are quite different.The results showed that the spherical LiMnPO_(4)/C calcined at 700℃had olivine-type crystal structure,and it showed a spherical shape composed of one-dimensional nano particles with a diameter of about 50 nm under SEM.The specific discharge capacity of this sample reached 148 mA·h/g for the first time at a rate of 0.1 C at room temperature.After 80 cycles,the specific discharge capacity was still around 140 mA·h/g,and the capacity retention rate was 94.6%.

关 键 词：锂离子电池 正极材料 LiMnPO_(4) 喷雾干燥法 

分 类 号：TQ131.11[化学工程—无机化工]