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Wyszukujesz frazę "Güler, M. A." wg kryterium: Autor

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    Wyświetlanie 1-5 z 5
    Tytuł:
    The Effect of Calcination Temperature on the Electrochemical Performance of ZnO Coated $LiMn_2O_4$/MWCNT Nanocomposite Cathodes
    Autorzy:
    Akbulut, A.
    Cetinkaya, T.
    Guler, M.
    Akbulut, H.
    Powiązania:
    https://bibliotekanauki.pl/articles/1218726.pdf
    Data publikacji:
    2014-02
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    82.47.Aa
    81.05.Mh
    81.20.Fw
    68.47.Gh
    Opis:
    In this study, it is aimed to develop $LiMn_2O_4$/MWCNT nanocomposite cathode materials by using different calcination temperatures (300, 500, 700°C). The aim of using MWCNTs in the active material is to overcome poor conductivity and to increase stability of the electrodes during charging and discharging. The nanocomposites were produced by sol-gel method, which allows producing very fine particle size of $LiMn_2O_4$. $LiMn_2O_4$ and $LiMn_2O_4$/MWCNT were uniformly coated on an Al-foil to obtain 500 μm thicknesses with a specific amount of binder and conducting agent. The surfaces of cathodes were coated with ZnO by using magnetron sputtering PVD with a thickness of 10 nm. Coin-type (CR2016) test cells were assembled, directly using the $LiMn_2O_4$/MWCNTs and surface coated $LiMn_2O_4$/MWCNTs as anode and a lithium metal foil as the counter electrode.
    Źródło:
    Acta Physica Polonica A; 2014, 125, 2; 331-334
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Sol-Gel Synthesis of Nanocomposite $Cu-Li_4Ti_5O_{12}$ Structures for Ultrahigh Rate Li-Ion Batteries
    Autorzy:
    Erdas, A.
    Ozcan, S.
    Guler, M.
    Akbulut, H.
    Powiązania:
    https://bibliotekanauki.pl/articles/1401274.pdf
    Data publikacji:
    2015-04
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    82.47.Aa
    88.80.ff
    Opis:
    In this study, spinel $Li_4Ti_5O_{12}$ materials were successfully synthesized by a simple and facile sol-gel process and electroless copper deposition techniques. The characteristics of the as-prepared $Li_4Ti_5O_{12}$ and $Cu-Li_4Ti_5O_{12}$ were examined by X-ray diffraction and scanning electronic microscopy, while the electrochemical performances including charge/discharge and rate performance tests were also investigated. $Cu-Li_4Ti_5O_{12}$ electrode demonstrated the superior initial discharge capacity and rate capability to $Li_4Ti_5O_{12}$ electrode, cycled between 1.0 and 2.5 V. The enhanced rate capability can be attributed to the higher $Li^{+}$ diffusivity and lower charge-transfer resistance due to the electroless deposition of copper. Moreover, when both electrodes discharged with 80 C state of discharge conditions, the reversible capacities were further increased ım70 mAh $g^{-1}$ with excellent cycling stability and almost no irreversible capability was observed during cycling.
    Źródło:
    Acta Physica Polonica A; 2015, 127, 4; 1026-1028
    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
    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:
    Evaluation of Li-Air Batteries With EC-DEC Based Nanocomposite Electrolytes
    Autorzy:
    Akbulut, A.
    Guler, M.
    Cetinkaya, T.
    Uysal, M.
    Akbulut, H.
    Powiązania:
    https://bibliotekanauki.pl/articles/1401250.pdf
    Data publikacji:
    2015-04
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    82.45.Gj
    88.80.ff
    82.45.Xy
    Opis:
    Electrolytes based on organic carbonate solvents of ethylene carbonate (EC) and diethyl carbonate (DEC) were prepared by using LiPF₆ as the Li-source. Nano sized Al₂O₃ (50 nm) was used as a reinforcing component in order to control corrosion and Li₂CO₃ formation. Corrosion of the Li foil anode and electrochemical tests were performed by using EC/DEC/LiPF₆ and nanocomposite EC/DEC/LiPF₆/5wt.% Al₂O₃ electrolytes. Electrochemical tests were performed in the swagelok cells by using Li foil anode and carbon air cathode electrodes. Structural tests were carried out by using scanning electron microscopy (SEM), x-ray diffraction (XRD) and Raman spectroscopy. Results revealed that incorporation of nano Al₂O₃ leads to a decrease of corrosion rate of Li anode and a small decrease in the capacity of the air cells.
    Źródło:
    Acta Physica Polonica A; 2015, 127, 4; 1023-1025
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-5 z 5

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