Preparation of spinel-type LiMn_2O_4 Cathode material by melt-impregnation method for lithium-ion rechargeable batteries

摘要

Spinel-type LiMn_2O_4 cathode materials were prepared by melt-impregnation method with different Mn sources and characterized by BET, XRD and TEM as well as electrochemical testing. The results demonstrated that the cathode material prepared with CMD as Mn sources has smaller particle size, higher first charge and discharge capacity, poor cyclic performance, whereas the cathode material prepared with EMD as Mn soruce has larger particle size, lower first charge and discharge capacity, better cyclic stability. These can be attributed to difference of Mn sources and specific surface areas and purities of Mn sources.