Synthesis and Electrochemical Performances of Nano-particle FePO4 and Ce-doped FePO4 Cathode Materials for Lithium lOn Batteries by Microemulsion Method
Nano-sized FePO4 and Fe1-xCexPO4 (x=0.02,0.04,0.08) cathode materials were synthesized by microemulsion method.The samples were prepared via a microemulsion system in a H2O/cyclohexane/Triton x-100/n-butyl alcohol at different temperatures (30 ℃,45 ℃,50 ℃,60 ℃) and then sintered at 380 ℃and 460 ℃ for 3 h.The thermal stability,structure and morphology were investigated by means of TG/DCS,X-ray diffraction (XRD),field emission-scanning electron microscopy (FE-SEM),and the electrochemical properties were characterized by cyclic voltammetry (CV) and galvanostatic charge and discharge tests.Results show that synthesis temperature has a great influence on the performances of FePO4,and the sample synthesized at 45 ℃ shows the best performances with a diameter of about 20 nm and a high discharge initial specific capacity of 142mAh/g and retaining 123mAh/g after 20 cycles at 0.1 C.The Ce-doped FePO4,Fe1-xCexPO4 (x=0.02,0.04,0.08),can effectively improve the electrochemical properties of FePO4 cathode materials.The Fe0.96Ce0.04PO4 exhibits an initial discharge capacity of 158.2mAh/g and retains 152mAh/g after 20 cycles at 0.1 C.Hence,Fe0.96Ce0.04PO4 is a promising candidate for cathode materials of lithium ion batteries.
Cathode materials Nano-particles FePO4 Fe1xCexPO4 Microemulsion method
Shiming Zhang Junxi Zhang Bocheng He Suojiong Xu Xuji Yuan
Electrochemical Research Group, Shanghai University of Electric Power, Shanghai, 200090 China
国际会议
the Chinese Materials Congress 2012(2012年中国材料大会(CMC2012))
太原
英文
35-43
2012-07-13（万方平台首次上网日期，不代表论文的发表时间）