钛掺杂的非化学计量LiFePO_4的合成与电化学性能研究(英文)  

Synthesis and Electrochemical Properties of Ti-doped Nonstoichiometric LiFePO_4 for Lithium-ion Battery Application

作　　者：孙玉恒[1] 刘东强[1] 吁霁[1] 刘兴泉[1] 

机构地区：[1]中国科学院成都有机化学研究所

出　　处：《无机化学学报》2006年第9期1711-1714,共4页Chinese Journal of Inorganic Chemistry

基　　金：四川省科技攻关重点项目(No.02GG0980);中国科学院"西部之光"联合学者项目资助。

摘　　要：Ti-doped nonstoichiometric LiFePO4, i.e. Li0.95Fe0.95Ti0.05PO4 was synthesized by solid-state reaction method. X-ray diffraction (XRD), Fourier-transform infrared spectroscopy (FTIR), Scanning electron microscope (SEM) and electrochemical charge and discharge tests were used to characterize the as-prepared sample. The results indicate that Li0.95Fe0.95Ti0.05PO4 used as the cathode material for lithium-ion battery exhibits improved cyclic stability and rate capability than those of undoped LiFePO4. 150 mAh·g-1 of discharge capacity was achieved at 0.1 C (17 mA ·g-1) at room temperature.Ti-doped nonstoichiometric LiFePO4, i.e. Li0.95Fe0.95Ti0.05DO4 was synthesized by solid-state reaction method. X-ray diffraction （XRD）, Fourier-transform infrared spectroscopy （FTIR）, Scanning electron microscope （SEM） and electrochemical charge and discharge tests were used to characterize the as-prepared sample. The results indicate that Li0.95Fe0.95Ti0.05DO4 used as the cathode material for lithium-ion battery exhibits improved cyclic stability and rate capability than those of undoped LiFePO4. 150 mAh·g^-1 of discharge capacity was achieved at 0.1 C （17 mA·g^-1） at room temperature.

关 键 词：LIFEPO4 电化学性能 钛掺杂 非化学计量 

分 类 号：O614.111[理学—无机化学] O614.811[理学—化学]