SYNTHESIS OF NANO-SIZED FePO4 CATHODE MATERIAL VIA A MICROEMULSION TECHNIQUE
A novel synthetic method is developed to prepare nano-sized FePO4 powders used as cathode materials of lithium ion batteries.The samples are prepared via a microemulsion system in a H2O/cyclohexane/Triton x-100/n-butyl alcohol, and then sinter at different temperatures (380℃, 460℃, 550℃, 650() for 3h.The thermal stability, structure, morphology and particle size are investigated by means of TG/DSC, X-ray diffraction (XRD), field emission-scanning electron microscopy (FE-SEM), and the electrochemical properties are characterized by cyclic voltammetry (CV) and galvanostatic charge and discharge tests.Results show the grain size of FePO4 particles sintered at 460℃ and 380℃ for 3h ranges from 10nm to 20nm, and the crystal structure is amorphous.The initial discharge specific capacity of FePO4 cathode sintered at 460℃ for 3h reaches 139mAhg1 and 110mAh/g, respectively, at 0.1C and 0.3C.Increasing sintering temperature leads to the small particles agglomeration and the crystalline growth, and the crystal structure changes from amorphous to trigonal when the sintering temperature is up to 550℃.The discharge specific capacity also decreases with the increase of the sintering temperature.These results suggest that nano-sized particles and amorphous structure can significantly improve the performances of FePO4 cathode.
Iron Phosphate Microemulsion Cathode Material Lithium Ion Batteries
Shi Ming ZHANG Jun Xi ZHANG Suo Jiong XU Xu Ji YUAN Tian TIAN
Electrochemical Research Group,Shanghai University of Electric Power,Shanghai,200090 China
国际会议
2012 China Functional Materials Technology and Industry Forum(2012中国功能材料科技与产业高层论坛)(CFMTIF2012)
昆明
英文
675-682
2012-11-09（万方平台首次上网日期，不代表论文的发表时间）