Synthesis and characterization of spinel Li1.05Cr0.1Mn1.9O4−z F z as cathode materials for lithium-ion batteries
Tóm tắt
Samples with the nominal stoichiometry Li1.05Cr0.1Mn1.9O4−z
F
z
(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−z
F
z
samples deliver relatively low capacity and poor cycling properties at 55°C.
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