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Structure of Electrochemically Lithiated Li_(0.33)MnO_2 预览

Structure of Electrochemically Lithiated Li_(0.33)MnO_2
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摘要 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. 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.
作者 CHEN Hong WEI Ying-jin WANG Chun-zhong CHEN Gang CHEN Hong1,2,WEI Ying-jin3,WANG Chun-zhong3 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
出处 《高等学校化学研究:英文版》 SCIE CAS CSCD 2011年第4期 669-672,共4页 Chemical Research in Chinese University
基金 Supported by the National High-Tech Research and Development Program of China(No.2009CB220110) the Development Program of Science and Technology of Jilin Province China(Nos.20100557 20075007)
关键词 单斜结构 扩展X射线吸收精细结构 X射线吸收光谱 LIMNO2 固态反应 正极材料 同步辐射 晶体结构 Lithium ion battery Phase transformation X-Ray absorption spectroscopy(XAS) Raman scattering
作者简介 Corresponding author. E-mail: wcz@jlu.edu.cn
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