Synthesis And Performance Of Lini0.45mn0.55o2 As Cathodes For Li-Ion Batteries With The Composite Properties Of Materials

A compound as the lithium ion battery cathode materials were synthesized by high temperature solid phase synthesis method. The material is mainly the hexagonal structure and R (3) over barm space group, and there is a little other phase. The XPS spectra display in the materials the Mn element existed by Mn4+ and the Ni element existed by the mix valent state between Ni2+ and Ni3+; the energy loss spectrum and ICP results are consistent, to ensure that the compounds is LiNi0.45Mn0.55O2 which we need; SEM figure shows it has a loose structure, particle size is about 0.2 mu.m. At a current density 30mA/g at room temperature AC impedance analysis results show that an initial discharge capacity of 298 mAh/g,which is higher than theoretical capacity of LiMnO2 285 mAh/g, that may be because of the synthesis LiNi0.45 Mn-0.55 O-2 is composite materials.After 13 circles it dropped to 93.2mAh/g and was steady, the efficiency reached 91.3%.