不同锰源制备尖晶石型锰酸锂正极材料的对比研究

Comparative Study on Properties of Spinel LiMn_2O_4 Prepared from Different Manganese Sources

本文分别以P型电解二氧化锰、低钠电解二氧化锰和高纯四氧化三锰为原料制备了尖晶石型锰酸锂,利用ICP、激光粒度仪、比表面积分析仪、XRD、SEM分析了不同锰源及锰酸锂产品的理化性能及微观结构,并通过充放电测试仪研究了不同锰源制备的锰酸锂产品的电性能。研究发现,与P型电解二氧化锰相比,低钠电解二氧化锰和高纯四氧化三锰反应活性更高,所制备的尖晶石型锰酸锂55℃高温循环性能更好,55℃循环400周容量保持率为78.2%。

Spinel LiMn2O4 samples were prepared from electrolytic manganese dioxide （type P）, electrolytic manganese dioxide with low sodium content and high purity Mn3O4 respectively. The properties and structure of the manganese sources and the LiMn2O4, products were determined by ICP, laser scattering particle size distribution analyzer, surface area analyzer, X-ray diffraction and scanning electron microscope. Electrical properties of the LiMn2O4 products were also studied by electrochemical measurements. The results show that the reaction activity of electrolytic manganese dioxide with low sodium content and high purity Mn3O4 was higher than electrolytic manganese dioxide （type P）. The LiMn2O4 prepared by electrolytic manganese dioxide with low sodium content and high purity Mn3O4 had better cycle behavior at 55℃ with the capacity retention of 78.2% at the 400th cycle.