First-principles investigation of phase stability in LixCoO2


VanderVen A., AYDINOL M. K. , Ceder G., Kresse G., Hafner J.

PHYSICAL REVIEW B, cilt.58, ss.2975-2987, 1998 (SCI İndekslerine Giren Dergi) identifier identifier

  • Cilt numarası: 58 Konu: 6
  • Basım Tarihi: 1998
  • Doi Numarası: 10.1103/physrevb.58.2975
  • Dergi Adı: PHYSICAL REVIEW B
  • Sayfa Sayıları: ss.2975-2987

Özet

In this work, the phase diagram of LixCoO2 is calculated from first principles for x ranging from 0 to 1. Our calculations indicate that there is a tendency for Li ordering at x=1/2 in agreement with experiment [J. N. Reimers and J. R. Dahn, J. Electrochem. Sec. 139, 2091 :1992)]. At low Li concentration, we find that a staged compound is stable in which the Li ions selectively segregate to every other Li plane leaving the remaining Li planes vacant. We do not find the two-phase region observed at high Li concentration and speculate that this two-phase region is caused by the metal-insulator transition that occurs at concentrations slightly below x =1.