【摘要】 利用液相沉淀法制备MnCO₃前驱体,该前驱体为球形,且分散均匀。利用MnCO₃前驱体作为自模板进一步制备球形LiMn₂O₄,通过优化制备条件,采用X射线衍射仪、扫描电镜和恒电流充放电测试对球形LiMn₂O₄进行测试。结果表明:煅烧温度对材料的结构、形貌以及电化学性能有影响。当煅烧温度为700℃,煅烧时间为8h时可制得结构良好的LiMn₂O₄,其分散性较好,形貌为中空球形。在0.2C倍率下进行充放电测试,首次放电容量可以达到123.6mAh/g,30次循环后容量保持率为93.12%,展现了良好的电化学性能。更多还原

【Abstract】 MnCO₃ precursor was prepared by liquid phase precipitation method.The precursor was spherical and homogeneous distribution,then used as self-template to prepare spherical LiMn₂O₄.The synthetic conditions,morphologies and electrochemical performances were investigated.The results which from the series tests,such as X-ray diffraction（XRD）,scanning electronic microscope（SEM）and constant current charge and discharge,indicated that calcination temperatures had influence on the structures,morphologies and electrochemical performance.When the calcination temperature was 700℃ and the calcination time was 8 h,the hollow spherical products with good structure and good dispersion were obtained.LiMn₂O₄ microspheres obtained by optimal synthetic route can deliver a discharge capacity of 123.6 mAh/g at 0.2 Cand 93.12% of the initial storage capacity was maintained after 30 cycles,which showed good electrochemical performance.更多还原