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    Wyświetlanie 1-4 z 4
    Tytuł:
    Investigation of Tin Oxide Based Nanocomposites for Li-Ion Batteries
    Autorzy:
    Cevher, O.
    Cetinkaya, T.
    Tocoglu, U.
    Guler, M.
    Akbulut, H.
    Powiązania:
    https://bibliotekanauki.pl/articles/1399889.pdf
    Data publikacji:
    2013-02
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    88.30.rh
    81.05.Dz
    81.15.Cd
    82.47.Aa
    Opis:
    In this work, tin oxide ($SnO_2$) films were deposited on multiwall carbon nanotube buckypaper using a rf magnetron sputter process in a mixed oxygen/argon (1/9) gas environment. Conditions for the growth of $SnO_2$ thin films on multiwall carbon nanotube buckypaper by rf sputtering are: target composition $SnO_2$ (99.999 wt%); total system pressure 1 Pa; sputtering power (rf) 75, 100 and 125 W, respectively; $O_2//Ar$ (1/9) gas mixture. The surface morphology of the $SnO_2$ multiwall carbon nanotube composite films was investigated by scanning electron microscopy. The crystallographic structure of the sample was determined by X-ray diffraction. The electrochemical properties of $SnO_2$ multiwall carbon nanotube composite anodes were investigated by galvanostatic charge-discharge experiments.
    Źródło:
    Acta Physica Polonica A; 2013, 123, 2; 358-360
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Preparation and Electrochemical Performance of ZnO Films as Anode Materials for Li-Ion Batteries
    Autorzy:
    Cevher, O.
    Cetinkaya, T.
    Tocoglu, U.
    Guler, M.
    Akbulut, H.
    Powiązania:
    https://bibliotekanauki.pl/articles/1399886.pdf
    Data publikacji:
    2013-02
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    81.05.Dz
    81.15.Cd
    82.47.Aa
    Opis:
    In this work, the effect of rf power on the structural, electrical and electrochemical properties of ZnO thin films was investigated. ZnO thin films were deposited on glass and Cr coated stainless steel substrates by rf magnetron sputtering in pure Ar gas environment. ZnO thin films for different rf powers (75, 100, and 125 W) were deposited keeping all other deposition parameters fixed. ZnO thin films were used as negative electrode materials for lithium-ion batteries, whose charge-discharge properties, cyclic voltammetry and cycle performance were examined. A high initial discharge capacity about 908 mAh g^{-1} was observed at a 0.5 C rate between 0.05 and 2.5 V. The crystallographic structure of the sample was determined by X-ray diffraction. The electrical resistivity of the deposited films was measured by the four-point-probe method. The thickness of the ZnO thin films was measured using a profilometer.
    Źródło:
    Acta Physica Polonica A; 2013, 123, 2; 355-357
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Cr and V Substitution in the LiMn₂O₄Spinel Positive Electrode Li-Ion Batteries
    Autorzy:
    Akbulut, A.
    Cetinkaya, T.
    Guler, M.
    Uysal, M.
    Akbulut, H.
    Powiązania:
    https://bibliotekanauki.pl/articles/1401245.pdf
    Data publikacji:
    2015-04
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    82.47.Aa
    81.20.Fw
    81.15.-z
    Opis:
    In this study, $LiCr_{0.2}V_{0.4}Mn_{1.4}O_4$ cathode active electrode materials were produced via a facile sol-gel method at 800°C. The surfaces of the $LiCr_{0.2}V_{0.4}Mn_{1.4}O_4$ cathode active electrode materials were then coated with Cu in order to increase the conductivity and suppress the manganese ion dissolution into the electrolyte. The structure and electrochemical properties of the obtained Cr and V substituted LiMn₂O₄ powders were investigated by X-ray diffraction (XRD), scanning electron microscopy (SEM), galvanostatic charge- discharge test and electrochemical impedance spectroscopy (EIS). The improvement in the cycling performances attributed to stabilization of spinel structure by bication ion substation and Cu coating on the spinel particles. EIS analysis confirmed that bication doping and conductive Cu coating contributed stability of the spinel electrodes and provided stable electrolyte/electrode interface due to the suppression of electrolyte decomposition
    Źródło:
    Acta Physica Polonica A; 2015, 127, 4; 1019-1022
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The Electrochemical Properties of Cu Coated $LiCr_{0.2}V_{0.2}Mn_{0.6}O_2$ Nanocomposites for High Rate Li-Ion Batteries
    Autorzy:
    Algul, H.
    Erdas, A.
    Tokur, M.
    Guler, M.
    Akbulut, H.
    Alp, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/1401278.pdf
    Data publikacji:
    2015-04
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    82.47.Aa
    81.15.-z
    88.80.ff
    Opis:
    Several reported problems of commercial LiCoO₂ electrode materials such as high cost, toxicity, limited rate capability and safety concerns are still remain to be problematic to develop the lithium ion consumer electronics such as mobile phones, tablets and notebook computers. In this study, an alternative nanocomposite electrode material based on $LiCr_{0.2}V_{0.2}Mn_{0.6}O_2$ and copper coated one were produced via a facile sol-gel method and electroless Cu deposition techniques. The resulting samples were characterized by X-ray diffraction (Rigaku DMax 2200 diffractometer) using a monochromatized Cu-Kα source (λ=1.5406 Å) and 2θ scan range from 10° to 80° with a speed of 1° $\text{min}^{-1}$. The scanning electron microscope (SEM) was used in order to characterize the morphology of the active materials. The as-synthesized $Cu//LiCr_{0.2}V_{0.2}Mn_{0.6}O_2$ composite cathode exhibits a stable capacity on cycling and good rate capability after 50 cycles and total capacity retention of 93% is obtained. The unique 2D structure of the composite cathode material, its good electrochemical performances and its relatively low cost comparing to LiCoO₂, make this material very promising for applications.
    Źródło:
    Acta Physica Polonica A; 2015, 127, 4; 1038-1041
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-4 z 4

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