Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
1532242 | Materials Science and Engineering: B | 2006 | 13 Pages |
Abstract
The layered LiCo1âyNiyO2 microcrystalline powders were synthesized by a sol-gel method using citric acid as a chelating agent in the range 0.2 â¤Â y â¤Â 0.8. Submicron-sized particles of the precursor were obtained at temperature below 400 °C and microcrystalline powders were grown by thermal treatment at 700 °C for 5 h in air. The carboxylic-based acid functioned such as a fuel, decomposed the homogeneous precipitate of metal complexes at low temperature, and yielded the free impurity LiCo1âyNiyO2 single-phases suitable for electrochemical applications. The synthesized products were characterized by structural, spectroscopic and thermal analyses. FT-IR measurements provide information on the growth process and the final local environment in the cationic sublattice of LiCo1âyNiyO2 solid solution. The electrochemical performance of the synthesized products in rechargeable Li cells was evaluated using non-aqueous solution 1 M LiPF6 in EC-DMC as electrolyte. The electrochemical features of a series of LiCo1âyNiyO2 compounds (0.2 â¤Â y â¤Â 1.0) are discussed in relation with their synthesis procedure and substitutive amount. The substitution of Ni3+ for Co3+ in LiCo1âyNiyO2 for y = 0.75 shows improvement of the specific capacity at ca. 187 mAh/g upon 32 cycles.
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Authors
C.M. Julien, A. Amdouni, S. Castro-Garcia, M. Selmane, S. Rangan,