Samples with the nominal stoichiometry Li1.05Cr0.1Mn1.9O4-zFz（z=0,0.05,0.1,0.15,and 0.2） were synthesized via the solid-state reaction method and characterized by X-ray powder diffraction（XRD）,scanning electron mi...Samples with the nominal stoichiometry Li1.05Cr0.1Mn1.9O4-zFz（z=0,0.05,0.1,0.15,and 0.2） were synthesized via the solid-state reaction method and characterized by X-ray powder diffraction（XRD）,scanning electron microscopy（SEM）,galvanostatic charge/discharge, and slow rate cyclic voltammetry（SSCV） techniques.The results show that the pure spinel phase indexed to Fd3m can be obtained when z=0, 0.05,and 0.1.The substitution of F for O with z≤0.1 contributes to the increase of initial capacity compared with Li1.05Cr0.1Mn1.9O4 spinels. However,when the F-dopant content is designed to be 0.15 and 0.2,the Li1.05Cr0.1Mn1.9O4-zFZ samples deliver relatively low capacity and poor cycling properties at 55℃.展开更多
基金supported by the National Natural Science Foundation of China(No.50702007)Beijing Municipal Natural Science Foundation(No.2083029)
文摘Samples with the nominal stoichiometry Li1.05Cr0.1Mn1.9O4-zFz（z=0,0.05,0.1,0.15,and 0.2） were synthesized via the solid-state reaction method and characterized by X-ray powder diffraction（XRD）,scanning electron microscopy（SEM）,galvanostatic charge/discharge, and slow rate cyclic voltammetry（SSCV） techniques.The results show that the pure spinel phase indexed to Fd3m can be obtained when z=0, 0.05,and 0.1.The substitution of F for O with z≤0.1 contributes to the increase of initial capacity compared with Li1.05Cr0.1Mn1.9O4 spinels. However,when the F-dopant content is designed to be 0.15 and 0.2,the Li1.05Cr0.1Mn1.9O4-zFZ samples deliver relatively low capacity and poor cycling properties at 55℃.
