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7Li MAS NMR studies of Li4P2O7 and LiFePO4 materials

  • Journal of the Korean Crystal Growth and Crystal Technology
  • Abbr : J. Korean Cryst. Growth Cryst. Technol.
  • 2011, 21(1), pp.15-20
  • Publisher : The Korea Association Of Crystal Growth, Inc.
  • Research Area : Engineering > Materials Science and Engineering

Doug-Young Han 1 박남신 2 Sang Hyuk Lee 2 이학만 2 Chang-Sam Kim 2

1한국기초과학지원연구원
2한국과학기술연구원

Accredited

ABSTRACT

7Li Magic Angle Spinning (MAS) NMR spectroscopy has been used to study the lithium local environments in Li4P2O7 and LiFePO4 materials. The purpose of this study was to know the structure of the solid electrolyte interphase (SEI) in lithium ion cells composed of LiFePO4 as cathode material. Li4P2O7 and LiFePO4 were prepared by a solid-state reaction. The 7Li MAS NMR experiments were carried out at variable temperatures in order to observe the local structure changes at the temperatures in Li4P2O7 system. The 7Li MAS NMR spectra of in Li4P2O7 indicate that the lithium local environments in Li4P2O7 were not changed in the temperature range between 27oC and 97oC. Through this work, we confirmed that the small amount of Li4P2O7 less than 5.0 wt% in LiFePO4 could be clearly measured by the 7Li MAS NMR spectroscopy at high spinning rate over than 11 kHz.

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