以醋酸锂、醋酸锰和醋酸铬为原料,采用熔盐燃烧法在300℃、400℃、500℃、600℃一次燃烧反应1h和650℃二次焙烧6h制备LiCr0.05Mn1.95O4正极材料。通过X射线衍射仪和扫描电子显微镜对样品的物相组成、结晶性和形貌进行表征,并用恒电流充放电测试、循环伏安和电化学交流阻抗进行电化学性能测试表征。结果表明:所有样品均具有LiMn2O4的尖晶石结构,没有任何杂质相,颗粒尺寸分布为110～250nm。燃烧温度为500℃合成的 LiCr0.05Mn1.95O4正极材料具有较好的电化学性能,在1C、5C和10C倍率,循环100次后,其容量保持率分别为90.29%、91.58%、90.26%。
LiCr0.05Mn1.95O4 cathode materials were prepared via a molten-salt combustion method at the first combustion reaction of 300℃,400℃,500℃ and 600℃ for 1h combined with the second calcination of 650℃ for 6h using lithium acetate,manganese acetate and chromium acetate as raw materials.The phase composition,crystallinity and morphology of the as-prepared samples were characterized by XRD and SEM,whilst the electrochemical performance were tested by galvanostatic charge and discharge measurement,cyclic voltammetry and electrochemical alternating current impedance.The results shown that all the samples had the spinel structure of LiMn2O4,without any impurity phase,the particle size distribution was 110～250nm.The LiCr0.05Mn1.95O4 synthesized at 500℃ delivered good electrochemical performance,the capacity retention were 90.29%,91.58%,and 90.26% after 100 cycles at 1C,5C and 10C,respectively.
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