The compound, Li1.1Mn2O3.95F0.05 was synthesized by means of solid - state reaction with precursors ball-milled in planetary micro-mill with alcohol as dispersing liquid, and was electrochemically tested as a cathode material for lithium rechargeable battery. The results showed that the performance of the compound was good, which had a surprising reversible capacity, up to 143mA·h/g, which was almost equivalent to that of LiCoO2. Furthermore, it exhibited satisfactory cyclic stability, with above 95% retainable capacity after cycling 115 times. SEM and TEM showed the sample were uniform particles with good crystal morphology. XRD analysis identified that the compound had a spinel structure of LiMn2O4. Atomic absorption spectroscope (AAS) proved that this compound was Li-rich Li1.1Mn2O3.95F0.05. Electrochemical test results, SEM, TEM, XRD and AAS supported that in Li-rich Li1.1Mn2O3.95F0.05, the added fluorine made the crystal space becoming larger and the intercalation- deintercalation of lithium ions was much easier and more lithium ions were involved into the reaction.

Key words: MANGANESE OXIDE, LITHIUM OXIDE, FLUORINE COMPOUNDS, SCANNING ELECTRON MICROSCOPES, TRANSMISSION ELECTRON MICROSCOPY, X-RAY DIFFRACTION ANALYSIS