Phase separation tendencies of aluminum-doped transition-metal oxides (LiAl(1-x)M(x)O(2)) in the alpha-NaFeO(2) crystal structure


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Buta S., Morgan D., VanderVen A., AYDINOL M. K. , Ceder G.

JOURNAL OF THE ELECTROCHEMICAL SOCIETY, cilt.146, sa.12, ss.4335-4338, 1999 (SCI İndekslerine Giren Dergi) identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 146 Konu: 12
  • Basım Tarihi: 1999
  • Doi Numarası: 10.1149/1.1392639
  • Dergi Adı: JOURNAL OF THE ELECTROCHEMICAL SOCIETY
  • Sayfa Sayıları: ss.4335-4338

Özet

First-principles methods are used to calculate the miscibility of eight aluminum-doped transition-metal oxides in the layered alpha-NaFeO(2) structure. This study finds that for all Li(Al,M)O(2) compounds investigated(M = Ti, V, Cr, Mn, Fe, Co, Ni, Cu) the enthalpy of mixing is positive. In addition, detailed analyses were performed on LiA(1-x)Co(x)O(2) and LiA(1-x)Cr(x)O(2) by calculating full temperature-composition phase diagrams. For the Li(Al,Co)O(2) system, we find regions of immiscibility below - 173 degrees C and above 600 degrees C. For both Li(Al,Co)O(2) and Li(A1,Cr)O(2) above 600 degrees C, Al-doping is limited by the formation of gamma-LiAlO(2). (C) 1999 The Electrochemical Society. S0013-4651(99)06-122-4. All rights reserved.