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Structural, magnetic and electrochemical studies on LiCo0.5Fe0.5O2
Authors:D. Kalpana  R. Justin Joseyphus  N. Sivakumar  A. Narayanasamy  M. V. Ananth
Affiliation:(1) Central Electrochemical Research Institute, Karaikudi, 630 006, India;(2) Materials Science Centre, Department of Nuclear Physics, University of Madras, Guindy Campus, Chennai, 600 025, India
Abstract:LiCo0.5Fe0.5O2 was prepared by sol–gel method. The sample had spinel, cubic and hexagonal phases up to 873 K and a single hexagonal phase above 1,073 K. The magnetic properties were studied at room temperature and at 77 K. The large coercivities observed for the samples annealed at 1,073 and 1,273 K show that these samples do not exhibit a simple antiferromagnetic ordering. From the Mössbauer and magnetization measurements, it is concluded that the hexagonal phase is only an antiferromagnet. The above results clearly demonstrate that the simple aqueous-based sol–gel process developed in this work provides a viable method to synthesize the fine cuboidal particles that display discharge capacity as high as ≈165 mAh/g, which is higher than the value obtained by M. Holzapfel et al. (Holzapfel M, Schreiner R, Ott A, Electrochim Acta 46:1063, 2001) for their samples synthesized by using the ion exchange method. This work suggests that the approaches based on solution chemistry are viable processes for synthesizing good quality electrode material.
Keywords:Lithium-ion batteries  Lithium cobalt oxide  LiCo0.5Fe0.5O2   M?ssbauer effect  Triangular antiferromagnetism
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