水热和流变相法合成3D“微纳结构”LiFePO_4锂离子电池正极材料  

Hydrothermal and Rheological Phase Method Synthesis of 3D “Micro-nanostructure”LiFePO_4 Used for Li-ion Batteries

作　　者：娄晓明[1] 黄佳丽[2] 李坦平[1] 胡汉祥[1] 胡波年[1] 

机构地区：[1]湖南工学院材料与化学工程学院建材研究所,衡阳421002 [2]湖南工学院建筑工程学院,衡阳421002

出　　处：《材料导报（纳米与新材料专辑）》2015年第2期246-248,共3页

基　　金：国家自然科学基金面上项目(21476066);教育部卓越工程师教育培养计划无机非金属材料工程(080203);湖南省"十二五"重点学科建设项目(080502);湖南省自然科学基金院校联合项目(13JJ6084)

摘　　要：介绍了通过采用水热法合成由纳米片自组装的类球形3D"微纳结构"FePO4·2H2O前驱体,再通过流变相锂化方法在650℃氩气气氛下加热10h,得到3D"微纳结构"LiFePO4锂离子电池正极材料。使用XRD、SEM对产物的晶型和形貌结构进行表征,表明该3D"微纳结构"FePO4·2H2O是由约100nm长、30nm厚的纳米片自组装而成。对该LiFePO4的电化学性能进行测试,结果显示该材料在10C、20C、30C时比容量分别达到116mAh/g、96mAh/g和75mAh/g。同时,该材料的振实密度测试结果为1.4g·cm-3。这表明3D"微纳结构"的LiFePO4能较好地兼顾良好的倍率性能和较高的振实密度。3D ＂Micro-nano-structure＂ LiFePO4 cathode materials for Li-ion batteries were synthesized via a hy-drothermal and rheolgical phase method by using the 3D ＂micro-nano-structure＂ FePO4 . 2H2O as the precursor, heated at 650 ℃ for 10 h at Ar flow. The XRD and SEM results revealed the 3D ＂micro-nano-structure＂ FePO4 . 2H2O were fabricated by nanoplates with a size about 100 nm length and 30 nm thick by self-assembly. The electrochemical properties measurement showed the 3D ＂micro-nano-structure＂ LiFePO4 could deliver excellent capability a- bout 116 mAh/g,96 mAh/g and 75 mAh/g at 10C,20C and 30C, respectively. Moreover, the LiFePO4 cathode materials also had a high tap-density about 1.4 g/ema. So, the 3D ＂micro-nano-structure＂ LiFePO4 possesses both the excellent high-rate performance and high tap-density.

关 键 词：水热法流 变相法 LIFEPO4 锂离子电池 正极材料 

分 类 号：O604[理学—化学]