Fully activated Li2MnO3 nanoparticles by oxidation reaction

Fully activated Li 2 MnO 3 nanoparticles were prepared by a chemical based oxidation reaction. All of the diffraction peaks of the prepared samples were well matched to a monoclinic phase (space group: C 2/ m ) with no impurity peaks and refined using the General Structure Analysis System (GSAS) program. The activated Li 2 MnO 3 sample showed homogeneously well-dispersed nanoparticles with a size of ∼10 nm. The oxidation state of Mn was confirmed by XPS. The activated Li 2 MnO 3 nanoparticles delivered a high charge capacity of 302 mA h g −1 above 4.5 V and discharge capacity of 236 mA h g −1 during the first cycle. Interestingly, the cycle performance of the activated Li 2 MnO 3 nanoparticles during extended cycles exhibited somewhat stable discharge capacities without any drastic capacity fading, even when cycled in the high voltage range of 2.0-4.9 V and after the phase transition to spinel. In terms of the rate performance, the activated Li 2 MnO 3 sample exhibited significantly superior properties compared to the bulk Li 2 MnO 3 sample, probably due to the nano-size particles with high crystallinity. Fully activated Li 2 MnO 3 nanoparticles with impressive electrochemical abilities were prepared by a chemical based oxidation reaction.