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1
Content available remote

The Effect of Calcination Temperature on the Electrochemical Performance of ZnO Coated LiMn_2O_4/MWCNT Nanocomposite Cathodes

100%
Akbulut A., Cetinkaya T., Guler M., Akbulut H.
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vol. 125
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issue 2
331-334
EN
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.
2
Content available remote

Characteristics and Electrochemical Performance of TiO_2:MWCNT Nanocomposite Anodes for Li-Ion Batteries

88%
Guler M., Cetinkaya T., Cevher O., Tocoglu U., Akbulut H.
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vol. 125
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issue 2
322-324
EN
In this study, highly porous buckypapers were manufactured via vacuum filtration techniques and nanocrystalline TiO_2 thin films were deposited on buckypapers using reactive radio frequency magnetron sputtering to understand the role of the deposition power. In addition, the effects of the deposition parameters on the electrochemical properties as an anode electrode for Li-ion batteries have also been studied.
3
Content available remote

Preparation and Electrochemical Performance of ZnO Films as Anode Materials for Li-Ion Batteries

88%
Cevher O., Cetinkaya T., Tocoglu U., Guler M., Akbulut H.
Acta Physica Polonica A
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2013
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vol. 123
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issue 2
355-357
EN
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.
4
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Investigation of Tin Oxide Based Nanocomposites for Li-Ion Batteries

88%
Cevher O., Cetinkaya T., Tocoglu U., Guler M., Akbulut H.
Acta Physica Polonica A
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2013
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vol. 123
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issue 2
358-360
EN
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.
5
Content available remote

Si/Mo/MWCNT Nanocomposites for Lithium Ion Battery Applications

88%
Cetinkaya T., Uysal M., Tokur M., Kartal M., Akbulut H.
Acta Physica Polonica A
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2015
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vol. 127
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issue 4
1048-1051
EN
In this study, silicon/multi-wall carbon nanotube (Si/MWCNT) and silicon/molybdenum/multi-wall carbon nanotube (Si/Mo/MWCNT) composites were produced by high speed planetary ball milling. Produced Si/MWCNT composite containing 50 wt.% Si and 50 wt.% MWCNT and dispersingdifferent amount of molybdenum nanopowders (1 wt.%, 3 wt.% and 5 wt.%) Si/Mo/MWCNT composites were produced by high speed planetary ball milling. Surface morphology of produced composite electrodes was characterized using scanning electron microscopy (SEM) and EDS dot-map analyze was performed to investigate dispersion of MWCNT and molybdenum powders in the composite structure. X-ray diffraction (XRD) technique was carried out to investigate structure of produced Si/Mo/MWCNT composites. Electrochemical performance of the electrodes were tested between 50 mV and 1.5 V in CR2016 test cell.
6
Content available remote

The Effect of Inorganic Nano Powder Additives in TEGDME for Lithium Air Batteries

88%
Kartal M., Uysal M., Cetinkaya T., Alp A., Akbulut H.
Acta Physica Polonica A
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2015
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vol. 127
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issue 4
1016-1018
EN
SiO₂ and Al₂O₃ nano fillers were added to an electrolyte composed of a solution 1 M LiPF₆ in tetra ethylene glycol dimethyl ether (TEGDME) and the effects of these nano powders on capacity and cycling performances were investigated. Galvanostatic charge/discharge (GC) measurements were performed in the assembled Li-air cells by using the nanocomposite electrolytes. The discharge capacities of these cells were cyclically tested by a battery tester at a constant current in the voltage range between 2.15 V and 4.25 V. Discharge products of nanocomposite electrolytes were characterized by SEM and XRD spectroscopies. The electrochemical results demonstrated that Al₂O₃ reinforced electrolyte showed higher discharge capacity and cyclability than those of SiO₂ reinforced electrolyte.
7
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Cr and V Substitution in the LiMn₂O₄Spinel Positive Electrode Li-Ion Batteries

88%
Akbulut A., Cetinkaya T., Guler M., Uysal M., Akbulut H.
Acta Physica Polonica A
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2015
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vol. 127
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issue 4
1019-1022
EN
In this study, LiCr_{0.2}V_{0.4}Mn_{1.4}O₄ 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}O₄ 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
8
Content available remote

Evaluation of Li-Air Batteries With EC-DEC Based Nanocomposite Electrolytes

88%
Akbulut A., Guler M., Cetinkaya T., Uysal M., Akbulut H.
Acta Physica Polonica A
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2015
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vol. 127
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issue 4
1023-1025
EN
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.
9
Content available remote

Preparation and Characterisation of Silicon/Carbon Nanotube Composite Electrodes for Li-Ion Battery Systems

88%
Cetinkaya T., Tocoglu U., Cevher O., Guler M., Akbulut H.
Acta Physica Polonica A
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2013
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vol. 123
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issue 2
398-400
EN
Silicon powders and different amounts of multiwalled carbon nanotube were mechanically alloyed in polyacrynitrile solution via high speed planetary ball milling. Produced composite was characterised via X-ray diffraction pattern, scanning electron microscopy, energy dispersive spectroscopy and thermogravimetric analysis.
10
Content available remote

Nanostructured Silicon Thin Film Electrodes for Li-Ion Batteries

88%
Tocoglu U., Cetinkaya T., Cevher O., Oguz Guler M., Akbulut H.
Acta Physica Polonica A
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2013
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vol. 123
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issue 2
380-382
EN
In this study we produced nanostructured silicon thin films as lithium ion battery electrodes. Films were sputtered onto stainless steel substrates from high purity silicon target via dc magnetron sputtering technique with using different powers. Morphology and crystal structure of films were characterized with the use of scanning electron microscopy, X-ray diffraction and energy dispersive spectroscopy analysis, respectively. The thickness of films was measured by using surface profiler. Coin type test cells were assembled in argon filled glove box. Electrochemical performance of cells was tested on an electrochemical analyzer using constant current densities over a voltage range of 0.2-2 V.
11
Content available remote

Novel Titanium Dioxide Based Nanocomposite Anodes for Li-Ion Batteries

88%
Oguz Guler M., Cevher O., Tocoglu U., Cetinkaya T., Akbulut H.
Acta Physica Polonica A
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2013
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vol. 123
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issue 2
390-392
EN
Carbon nanotube thin sheets - buckypapers - were prepared from multi-walled carbon nanotubes oxidized with different oxidation agents. Titanium dioxide films were then deposited by thermal evaporation of Ti films on buckypapers substrates followed by in situ dc plasma oxidation. The effect of oxidation power on the structural, compositional and electrochemical properties of the films was investigated.
12
Content available remote

Electrochemical Characterization of the Powder Silicon Anodes Reinforced with Graphite Using Planetary Ball Milling

88%
Cetinkaya T., Cevher O., Tocoglu U., Guler M., Akbulut H.
Acta Physica Polonica A
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2013
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vol. 123
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issue 2
393-395
EN
Mixed silicon/graphite anode materials were produced via mechanical milling process. The morphologies of mixed powders and electrodes were characterized via scanning electron microscopy and X-ray diffraction pattern. Electrochemical tests were performed by coin-type (CR2016) test cells. The cells were cyclically tested on a battery tester, and discharge capacities of produced anode materials were investigated with using constant current 300 mA/g over a voltage range of 80 mV-1.2 V.
13
Content available remote

Synthesis and Characterization of Antimony Doped Tin Oxide Nanocomposites for Li-Ion Batteries

88%
Guler M., Cevher O., Tocoglu U., Cetinkaya T., Akbulut H.
Acta Physica Polonica A
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2013
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vol. 123
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issue 2
383-385
EN
High content carbon nanotubes mats have been produced to multi-walled carbon nanotubes. Sb doped SnO_2 films were then deposited by rf magnetron sputtering on buckypapers substrates. The effect of oxidation pressure on the structural, compositional, and electrochemical properties of the films was investigated.
14
Content available remote

Electrochemical Performance of Silicon/MWCNT Composite Electrodes for Lithium Ion Batteries

88%
Cetinkaya T., Tocoglu U., Cevher O., Guler M., Akbulut H.
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vol. 125
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issue 2
285-287
EN
Silicon/MWCNT composite electrodes were produced using high-speed planetary ball milling. Content of MWCNT were altered in silicon/MWCNT composite electrodes and effect of MWCNT content on the electrochemical performance of silicon electrodes were characterized by scanning electron microscopy and X-ray diffraction techniques. Coin type CR2016 test cells were assembled by using produced nanocomposite electrodes. Prepared test cells were electrochemically cycled at a current density of 200 mA/g. Furthermore, cyclic voltammetry curve of composite electrodes were performed to investigate electrochemical reactions between electrode and electrolyte.
15
Content available remote

Cyclic Performance Study of Silicon/Carbon Nanotube Composite Anodes Using Electrochemical Impedance Spectroscopy

88%
Tocoglu U., Cevher O., Cetinkaya T., Guler M., Akbulut H.
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EN
Silicon based carbon nanotube composites were produced and their galvanostatic cycling properties analyzed depended on the electrochemical impedance spectroscopy. Composite anodes were produced via vacuum filtration and DC magnetron sputtering technique. Carbon nanotube papers were produced with vacuum filtration as substrate for silicon deposition and silicon was sputtered onto carbon nanotube papers via DC magnetron sputtering. Scanning electron microscopy and X-ray diffraction analysis were conducted for structural analysis of anodes. CR2016 coin cells were assembled for electrochemical tests. Electrochemical performance of anodes was tested via galvanostatic charge/discharge (100 cycles) analysis. Electrochemical impedance spectroscopy was carried out at every 25 charge/discharge cycle to determine relation between cyclic performance and electrochemical impedance of cells.
16
Content available remote

Nanocomposite ZnO:MWCNT Thin Films for Li-Ion Batteries Prepared via Reactive Magnetron Sputtering

88%
Guler M., Cetinkaya T., Cevher O., Tocoglu U., Akbulut H.
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vol. 125
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issue 2
319-321
EN
In this study, ZnO/MWCNT buckypaper nanocomposite structures were obtained as an anode electrode material for Li-ion batteries. MWCNT based buckypapers were produced via vacuum filtration techniques and the surfaces of the buckypapers were coated with ZnO in order to increase stability and mechanical integrity during charging and discharging processes. The effect of deposition powers on the battery performance is also investigated.
17
Content available remote

Effects of RF Power on Electrical and Structural Properties of Sputtered SnO_2:Sb Thin Films

76%
Cevher O., Guler M., Tocoglu U., Cetinkaya T., Akbulut H., Okumus S.
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vol. 125
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issue 2
293-295
EN
In this work, antimony doped tin oxide (SnO_2:Sb) thin films were fabricated using a radio frequency magnetron sputtering system on Si wafer and glass substrates. The base pressure in the sputtering chamber was 1.0 Pa. The SnO_2:Sb thin films were deposited for 1.0 h in a mixture of Ar and O_2 environment with O_2/Ar ratio of 10/90 at 75, 100, and 125 W RF sputtering powers. The microstructure of SnO_2:Sb thin films was assessed using a field emission scanning electron microscopy. The crystallographic structure of the sample was determined by X-ray diffraction. The average surface roughness (R_{a}) was measured with atomic force microscopy. The electrical resistivity of the deposited films was measured by the four-point-probe method. The thicknesses of the films were measured by surface profiler.
18
Content available remote

Thin Film Nanostructured ATO and ATO Based Composite Anodes for Li-Ion Batteries

76%
Cevher O., Guler M., Tocoglu U., Cetinkaya T., Akbulut H., Okumus S.
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vol. 125
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issue 2
296-298
EN
In this study, antimony doped tin oxide films were deposited on multiwall carbon nanotube buckypaper and Cr coated stainless steel substrates using a radio frequency magnetron sputtering process in a mixed oxygen/argon (5/95) gas environment. The depositions of antimony doped tin oxide on the multiwall carbon nanotube buckypaper and stainless steel substrates were carried out using the parameters organized as: target composition antimony doped tin oxide (SnO_2:Sb = 90:10 wt%); total system pressure 1 Pa; sputtering power (RF) 100 W. The surface morphology of the antimony doped tin oxide films was investigated by field emission scanning electron microscopy. The crystallographic structure of the samples was determined by X-ray diffraction. The electrochemical properties of antimony doped tin oxide and antimony doped tin oxide-multiwall carbon nanotube nanocomposite anodes containing CR2016 cells were measured by galvanostatic charge-discharge experiments.
19
Content available remote

Preparation and Characterization of Copper Powders with Sn Coating by the Electroless Plating

64%
Uysal M., Cetinkaya T., Gul H., Kartal M., Algul H., Tokur M., Alp A., Akbulut H.
Acta Physica Polonica A
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2015
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vol. 127
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issue 4
1106-1108
EN
In this work, Sn-Cu composite powders were produced using an electroless process. The tin content on the surface of copper powders was varied by using different concentrations of SnSO₄ in the plating bath. The surface morphology of the produced Sn-Cu composite powders was characterized using scanning electron microscopy (SEM). Energy dispersive spectroscopy (EDS) was used to determine the elemental surface composition of the composites. X-ray diffraction (XRD) analysis was performed to investigate the structure of the Sn-Cu composite powders. The electrochemical performance of Sn-Cu nanocomposites was studied by charge/discharge tests.
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