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  • Li-Ni-Co oxides  (1)
  • chelating agent  (1)
  • 1
    Electronic Resource
    Electronic Resource
    Studies of LiNi0.6Co0.4O2 Cathode Material Prepared by the Citric Acid-Assisted Sol-Gel Method for Lithium Batteries (1999)
    Springer
    Journal of sol gel science and technology 15 (1999), S. 63-72 
    Details
    ISSN: 1573-4846
    Keywords: lithium secondary batteries ; lithium nickel-cobalt oxides ; sol-gel method ; chelating agent ; citric acid
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract The layered LiNi0.6Co0.4O2 powders were synthesized at low temperature by a sol-gel method using citric acid as a chelating agent. 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 4 h in air. The carboxylic-based acid acted such as a fuel, decomposed the homogeneous precipitate of metal complexes at low temperature, and yielded the free impurity LiNi0.6Co0.4O2 single-phase suitable for electrochemical application. The synthesized products have been characterized by structural (XRD, SEM), spectroscopic (FTIR, Raman) and thermal (DTA/TG) analyses. Raman and FTIR measurements provide information on the local environment of the cationic sublattice of LiNi0.6Co0.4O2 solid solution. Electrochemical performance of the synthesized products in rechargeable Li cells were evaluated by employing as cathodes in non-aqueous organic electrolyte mixture of 1M LiPF6 in EC + DMC. The electrochemical behaviour of synthesized LiNi0.6Co0.4O2 is discussed in relation with its synthesis procedure.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1008765030990
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Physical Properties and Electrochemical Features of Lithium Nickel-Cobalt Oxide Cathode Materials Prepared at Moderate Temperature (1999)
    Springer
    Journal of electroceramics 3 (1999), S. 425-432 
    Details
    ISSN: 1573-8663
    Keywords: Li-Ni-Co oxides ; Raman ; FTIR ; electrochemical properties ; lithium batteries
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract In this paper, we report the synthesis, the physical properties and the electrochemical features of the lithium nickel-cobalt oxide cathode materials prepared by a combustion method at moderate temperature. Structural properties were investigated by X-ray diffraction, Raman scattering and FTIR. Spectroscopic measurements show unambiguously that the final product is identified as a modified-spinel structure (Fd3m space group) with the stoichiometric formula Li2[Ni0.5Co0.5]2O2. Electrochemical cells Li//Li2[Ni0.5Co0.5]2O2 were fabricated using an organic electrolyte and their performances were tested. For a modified-spinel Li2[Ni0.5Co0.5]2O4 structure the chemical diffusion coefficient of Li ions is around 10−10 cm2s, which is lower than for a layered LiNi0.5Co0.5O4 host matrix.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1009930317366
    Library Location Call Number Volume/Issue/Year Availability
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    Paper (German National Licenses)
    Fulltext
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