Structure of Electrochemically Lithiated Li0.33MnO2

Chemical Research in Chinese Universities ›› 2011, Vol. 27 ›› Issue (4): 669-672.

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Structure of Electrochemically Lithiated Li_0.33MnO₂

CHEN Hong^1,2, WEI Ying-jin³, WANG Chun-zhong^3* and CHEN Gang³

1. College of Materials Science and Engineering, Jilin University, Changchun 130012, P. R. China;
2. College of Physics, Beihua University, Jilin 132013, P. R. China;
3. State Key Laboratory of Superhard Materials, College of Physics, Jilin University, Changchun 130012, P. R. China

Received:2010-12-09 Revised:2011-02-28 Online:2011-07-25 Published:2011-06-29
Contact: WANG Chun-zhong E-mail:wcz@jlu.edu.cn
Supported by:
Supported by the National High-Tech Research and Development Program of China(No.2009CB220110) and the Development Program of Science and Technology of Jilin Province, China(Nos. 20100557, 20075007).

Abstract

Abstract: Li0.33MnO2 cathode material was synthesized by solid state reaction which showed a monoclinic structure. In situ synchrotron diffraction showed a reversible structural transition of Li0.33MnO2 during Li+ insertion/extraction. However, it is difficult to determine the crystal structure of lithiated Li0.33+xMnO2 based on their poorly resolved diffraction patterns. This difficulty was successfully resolved by X-ray absorption spectroscopy(XAS) and Raman scattering which are sensitive to the short-range ordering of material lattice. Extended X-ray absorption fine structure shows the co-existence of corner- and edge-shared [MnO6] in Li0.33MnO2, whereas only edge-shared [MnO6] in lithiated Li0.96MnO2. Significantly, the differences between the Raman spectra of Li0.33MnO2 and Li0.96MnO2 indicate the phase transition of the material with Li+ intercalation. This work shows that Li0.33MnO2 transforms to monoclinic LiMnO2 with Li+ intercalation. This phase transformation was suggested to evolve from the migration of Mn ions.

Key words: Lithium ion battery, Phase transformation, X-Ray absorption spectroscopy(XAS), Raman scattering

CHEN Hong, WEI Ying-jin, WANG Chun-zhong* and CHEN Gang. Structure of Electrochemically Lithiated Li_0.33MnO₂[J]. Chemical Research in Chinese Universities, 2011, 27(4): 669-672.

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Structure of Electrochemically Lithiated Li_0.33MnO₂

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