Journal of the Korean Magnetic Resonance Society (한국자기공명학회논문지)

Korean Magnetic Resonance Society (한국자기공명학회)
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Ex-situ 7Li MAS NMR Study of Olivine Structured Material for Cathode of Lithium Ion Battery

  • Lee, Youngil (Department of Chemistry, University of Ulsan) ;
  • An, JiEun (Department of Chemistry, University of Ulsan) ;
  • Park, Seul-A (Research Center for Industrial Chemical Biotechnology, Korea Research Institute of Chemical Technology) ;
  • Song, HyeYeong (Department of Chemistry, University of Ulsan)
  • Received : 2014.11.10
  • Accepted : 2014.12.11
  • Published : 2014.12.20
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Abstract

$^7Li$ nuclear magnetic resonance (NMR) spectra have been observed for $LiMPO_4$ (M = Fe, Mn) samples, as a promising cathode material of lithium ion battery. Observed $^7Li$ shifts of $LiFe_{1-x}Mn_xPO_4$ (x = 0, 0.6, 0.8, and 1) synthesized with solid-state reaction are compared with calculated $^7Li$ shift ranges based on the supertranferred hyperfine interaction of Li-O-M. Ex situ $^7Li$ NMR study of $LiFe_{0.4}Mn_{0.6}PO_4$ in different cut-off voltage for the first charge process is also performed to understand the relationship between $^7Li$ chemical shift and oxidation state of metals affected by delithiation process. The increment of oxidation state for metals makes to downfield shift of $^7Li$ by influencing the supertranferred hyperfine interaction.

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References

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