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Structural properties of LiNi1−yCoyO2 (0≤y≤1) synthesized by wet chemistry via malic acid-assisted technique

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Abstract

We have synthesized LiNi1−yCoyO2 powders by a sol-gel method using malic acid as a chelating agent. The dependence of physico-chemical properties of the powders (crystallinity, lattice constants, grain size) has been investigated by changing the malic acid quantity and the calcination temperature for the different LiNi1−yCoyO2 oxides in the composition range 0 ≤ y ≤1. Structural studies show that a layered single phase was obtained for the y values 0.2 ≤ y ≤ 1.0. The local cationic environment has been studied by Raman and FTIR spectroscopy. Using acid-assisted LiNi1−yCoyO2 powders (with compositions y=0.8 and y=0.6) calcined at 800 °C, Li//LiNi1−yCoyO2 cells were assembled and tested by galvanostatic titration. These cells had an initial capacity of 140 mAh/g in the voltage range 2.8-4.2 V and showed attractive charge-discharge profiles upon cycling.

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Authors and Affiliations

  1. Departamento Quimica Fundamental e Industrial, Universidade A Coruna, 15071 A, Coruna, Spain

    D. Mazas-Brandariz, M. A. Señarís-Rodríguez & S. Castro-García

  2. LMDH, Université Pierre et Marie Curie, UMR7603, 4 place Jussieu, 75252, Paris, France

    M. A. Camacho-Lopez & C. Julien

Authors
  1. D. Mazas-Brandariz
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  2. M. A. Señarís-Rodríguez
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  3. S. Castro-García
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  4. M. A. Camacho-Lopez
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  5. C. Julien
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Mazas-Brandariz, D., Señarís-Rodríguez, M.A., Castro-García, S. et al. Structural properties of LiNi1−yCoyO2 (0≤y≤1) synthesized by wet chemistry via malic acid-assisted technique. Ionics 5, 345–350 (1999). https://doi.org/10.1007/BF02375998

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  • DOI: https://doi.org/10.1007/BF02375998

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