Issue 23, 2012

Fully activated Li2MnO3nanoparticles by oxidation reaction

Abstract

Fully activated Li2MnO3 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: C2/m) with no impurity peaks and refined using the General Structure Analysis System (GSAS) program. The activated Li2MnO3 sample showed homogeneously well-dispersed nanoparticles with a size of ∼10 nm. The oxidation state of Mn was confirmed by XPS. The activated Li2MnO3 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 Li2MnO3 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 Li2MnO3 sample exhibited significantly superior properties compared to the bulk Li2MnO3 sample, probably due to the nano-size particles with high crystallinity.

Graphical abstract: Fully activated Li2MnO3 nanoparticles by oxidation reaction

Article information

Article type
Paper
Submitted
16 Feb 2012
Accepted
07 Apr 2012
First published
13 Apr 2012

J. Mater. Chem., 2012,22, 11772-11777

Fully activated Li2MnO3 nanoparticles by oxidation reaction

J. Lim, J. Moon, J. Gim, S. Kim, K. Kim, J. Song, J. Kang, W. B. Im and J. Kim, J. Mater. Chem., 2012, 22, 11772 DOI: 10.1039/C2JM30962A

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