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Nano energy v.31, 2017년, pp.495 - 503   SCIE
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Synchrotron-based x-ray absorption spectroscopy for the electronic structure of LixMn0.8Fe0.2PO4 mesocrystal in Li+ batteries

Wi, Sungun (WCU Hybrid Materials Program, Department of Materials Science and Engineering, and Research Institute of Advanced Materials, Seoul National University, Seoul 08826, Korea ); Park, Jungjin (Center for Nanoparticle Research, Institute for Basic Science, Seoul 08826, Korea and School of Chemical and Biological Engineering, Seoul National University, Seoul 08826, Korea ); Lee, Sangheon (WCU Hybrid Materials Program, Department of Materials Science and Engineering, and Research Institute of Advanced Materials, Seoul National University, Seoul 08826, Korea ); Kang, Joonhyeon (WCU Hybrid Materials Program, Department of Materials Science and Engineering, and Research Institute of Advanced Materials, Seoul National University, Seoul 08826, Korea ); Hwang, Taehyun (WCU Hybrid Materials Program, Department of Materials Science and Engineering, and Research Institute of Advanced Materials, Seoul National University, Seoul 08826, Korea ); Lee, Kug-Seung (Pohang Accelerator Laboratory, Pohang University of Science and Technology, Pohang 37673, Republic of Korea ); Lee, Han-Koo (Pohang Accelerato ); Nam, Seunghoon ( ); Kim, Chunjoong ( ); Sung, Yung-Eun ( ); Park, Byungwoo ( );
  • 초록  

    Abstract The carbon-coated LiMn 0.8 Fe 0.2 PO 4 (LMFP) mesocrystal, composed of ~40-nm-sized nanocrystallites, was designed to be favorable for the fast charge transport kinetics. The carbon-coated LMFP mesocrystal exhibited good electrochemical properties (i.e., high specific capacity and superior rate capability), ensuring that the LMFP mesocrystal is a proper model system to study the reaction mechanism upon the battery cycling. In order to investigate the electronic-structure effects of each transition metal (Mn and Fe) on the electrochemical performance, we performed synchrotron-based soft and hard x-ray absorption spectroscopy (sXAS and XAS), and quantitatively analyzed the changes of the transition-metal redox states in the carbon-coated LMFP electrodes during the electrochemical reaction. We believe that our comprehensive as well as complementary analyses using ex situ sXAS and in situ XAS can provide clear experimental evidence on the reaction mechanism of LiMn 0.8 Fe 0.2 PO 4 electrodes during battery operation. Highlights Mesocrystal LiMn 0.8 Fe 0.2 PO 4 synthesized by a straightforward solvothermal method. High specific capacity and superior rate capability. Quantitative analysis of synchrotron-based soft and hard x-ray absorption spectroscopy. Clear understanding on the reaction mechanism of Mn and Fe in LiMn 0.8 Fe 0.2 PO 4 . Graphical abstract [DISPLAY OMISSION]


  • 주제어

    LiMn0.   8Fe0.   2PO4 .   Electronic structure .   X-ray absorption spectroscopy .   Rate capability.  

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