【摘要】 采用高温固相法合成了Li_1.05Fe_0.97Nb_0.03PO₄/C,考察了二次煅烧温度对材料结构和电化学性能的影响。采用X射线衍射仪（XRD）和扫描电子显微镜（SEM）对材料的结构和形貌进行表征。结果表明:700℃合成的Li_1.05Fe_0.97Nb_0.03PO₄/C正极材料晶体结构以及形貌没有发生改变,仍为橄榄石型结构且具有最佳电化学性能。在0.1C倍率,2.4⁴.2V电压范围下首次放电比容量为161.2mAh/g;经过100次循环后,容量保持率为95.16%,具有良好的倍率性能和循环性能。更多还原

【Abstract】 Li_1.05Fe_0.97Nb_0.03PO₄/C was synthesized by high temperature solid method.The influence of the secondary calcination temperature on the structure and electrochemical performance of material were examined.The structure and morphology of material were characterized by X-ray diffraction（XRD）and scanning electron microscope（SEM）.The results presented that the material synthesized at 700℃ without changing the structure and particle sizes,which was still olivine-type and possessed excellent electrochemical performance.The electrochemical properties of material were tested in the voltage range of 2.4⁴.2V.The first specific discharge capacity reached 161.2mAh/g-1 at 0.1Crate,and after 100 cycles with a capacity maintenance of 95.16%,exhibiting agood rate performances and cycling stability.更多还原