The effect of LBO coating method on electrochemical performance of LiMn2O4 cathode material

The effect of the Li2O-2B2O3 (LBO) glass coating on the charge-discharge cycling performance of spinel powder (LiMn2O4) was investigated in the range of 3.5-4.5 V The LBO glass coating on the surface of the spinel powder was carried out using the solid-state and solution methods. The lithium manganese oxide, coated with LBO glass via the solution method retained 100% of its original capacity after 30 cycles, showing much better cyclability than both bare lithium manganese oxide and lithium manganese oxide coated with LBO via the solid-state method. The structure and morphology of surface-treated and bare LiMn2O4 were characterized by elemental analysis, X-ray diffraction (XRD) and scanning electron microscopy (SEM). SEM result showed that LBO glass film coated via solution based method, on the surface of LiMn2O4 powder was more homogenous distribution than that coated via the solid-state based method. The electrochemical results indicated that the solution method is a better way than the solid-state method for coating LBO on the surface of LiMn2O4 powder. (C) 2007 Elsevier B.V. All fights reserved.