Listar por autor "Julien, C."
Mostrando ítems 1-7 de 7
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Influence of aluminum doping on the properties of LiCoO2 and LiNi0.5Co0.5O2 oxides
Castro-García, Socorro; Castro Couceiro, Ada; Señarís-Rodríguez, M. A.; Soulette, F.; Julien, C. (Elsevier, 2003-01)We have prepared LiCo1−yAlyO2 and LiNi0.5−yAlyCo0.5O2 (0≤y≤0.3) powder samples by a low temperature sol–gel method using succinic acid as chelating agent. We have studied the details of their crystallographic and local ... -
IR characterization of Ln2−xSrxCoO4 (x≥1; Ln=La, Nd) oxides
Castro-García, Socorro; Sánchez-Andújar, Manuel; Rey Cabezudo, Carlos José; Señarís-Rodríguez, M. A.; Julien, C. (Elsevier, 2001-07)[Abstract] We have recorded the FTIR spectra of powder samples of Ln2−xSrxCoO4 (Ln=La, Nd) at room temperature. We have identified the infrared active modes (3A2u+4Eu), and analyzed how they change as a function of Ln and ... -
Layered LiNi0.5Co0.5O2 cathode materials grown by soft-chemistry via various solution methods
Julien, C.; Letranchant, C.; Rangan, S.; Lemal, M.; Ziolkiewicz, S.; Castro-García, Socorro; El-Farh, L.; Benkaddour, M. (Elsevier, 2000-07)[Abstract] The lithiated nickel–cobalt oxide LiNi0.5Co0.5O2 used as cathode material was grown at low-temperature using different aqueous solution methods. The wet chemistry involved the mixture of metal salts (acetates ... -
LiCo1−yMyO2 positive electrodes for rechargeable lithium batteries: II. Nickel substituted materials grown by the citrate method
Julien, C.; Amdouni, A.; Castro-García, Socorro; Selmane, M.; Rangan, S. (Elsevier, 2006-03)[Abstract] The layered LiCo1−yNiyO2 microcrystalline powders were synthesized by a sol–gel method using citric acid as a chelating agent in the range 0.2 ≤ y ≤ 0.8. Submicron-sized particles of the precursor were obtained ... -
Lithiated cobaltates for lithium-ion batteries: Structure, morphology and electrochemistry of oxides grown by solid-state reaction, wet chemistry and film deposition
Julien, C.; Castro-García, Socorro (Elsevier, 2001-07)[Abstract] We present the structural (XRD and Raman) and electrochemical properties of various oxides of the cobaltate family (with the α-NaFeO2-type structure) grown by solid-state reaction, wet chemistry and film deposition ... -
Magnetic and electronic properties of lithium cobalt oxide substituted by nickel
Gendron, F.; Castro-García, Socorro; Popova, E.; Ziolkiewicz, S.; Soulette, F.; Julien, C. (Elsevier, 2003-02)[Abstract] We measured susceptibility, electron-spin resonance, magnetization and electrical conductivity of LiCo1−yNiyO2 powders synthesized by wet-chemistry method using succinic acid as chelating agent. We found unusual ... -
Structural and electrochemical properties of Li-Ni-Co oxides synthesized by wet chemistry via a succinic-acid-assisted technique
Castro-García, Socorro; Julien, C.; Señarís-Rodríguez, M. A. (Elsevier, 2001)[Abstract] Lithiated metal oxides LiCo1−yNiyO2 were synthesized by a sol–gel method using succinic acid as chelating agent. Microcrystalline materials were formed by calcination in oxygen at 800°C. The physicochemical ...