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Synthesis and Characterization of Spinel Li_4Ti_5O_{12} Anode Material by CTAB Assisted Sol-Gel Method

100%
Kiliç Dokan F., Şahan H., Özdemır B., Özdemır N., Patat Ş.
Acta Physica Polonica A
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2014
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vol. 125
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issue 2
648-649
EN
Recently, there has been considerable interest in Li_4Ti_5O_{12} as a potential anode for use in lithium ion batteries. It has many advantages compared to the currently used graphite. It has a good reversibility but no structural change. The material has a theoretical specific capacity of 175 mAh g^{-1}. Li_4Ti_5O_{12} powders are usually synthesized by a solid-state reaction of lithium and titanium salts. This method was generally preferred because the synthesis procedures are simple. But there are some disadvantages of solid-state methods such as larger particle size of the products, inhomogeneous distribution, lack of stoichiometry control, etc. These disadvantages can be overcome by sol-gel method. Using surfactant in sol-gel method is easy control on crystal growth and size of the desired products.
2
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Effects of TiO_2 Source on the Electrochemical Performance of Li_4Ti_5O_{12}

100%
Kiliç Dokan F., Şahan H., Özdemır N., Özdemır B., Patat Ş.
Acta Physica Polonica A
|
2014
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vol. 125
|
issue 2
650-651
EN
This study examined the formation mechanism of Li_4Ti_5O_{12} by a ball mill assisted solid-state reaction between Li_2CO_3 and TiO_2 for applications in lithium ion batteries, also effects of TiO_2 source such as rutile type and anatase type on the electrochemical performance of Li_{4}Ti_5O_{12}. However, it is believed that the particle properties may depend significantly on the synthesis process and starting materials, which lead to final products with a range of sizes, morphologies, and even phases.
3
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The Effect of Multiple Cation (Al, Si, Ti, Co) Doping on Electrochemical Performance οf LiMn_2O_4 Cathode Active Material

86%
Kılıç Dokan F., Şahan H., Veziroğlu S., Akkuş Taş N., Aydın A., Patat Ş.
Acta Physica Polonica A
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2013
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vol. 123
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issue 2
365-367
EN
In order to improve the cycling performance of LiMn_2O_4, the spinel phases base and multiple cation doped LiMn_{1.95}Al_{0.0125}Si_{0.0125}Ti_{0.0125}Co_{0.0125}O_4, LiMn_{1.9}Al_{0.025}Si_{0.025}Ti_{0.025}Co_{0.025}O_4 spinels were synthesized by the glycine-nitrate combustion process. The structures of the products were investigated by X-ray diffraction, scanning electron microscopy and electrochemical tests.
4
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Improvement of Cycling Stability of LiMn_2O_4 Cathode by Al_2O_3 Surface Coating for Li-Ion Batteries

86%
Şahan H., Göktepe H., Kılıç Dokan F., Aydın A., Veziroğlu S., Patat Ş.
Acta Physica Polonica A
|
2013
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vol. 123
|
issue 2
368-370
EN
The effect of the Al_2O_3 coating on the charge-discharge cycling performance of spinel powder (LiMn_2O_4) was investigated in the range of 3.5-4.5 V at 1C. The Al_2O_3 coating on the surface of the spinel powder was carried out using the solution method, followed by 500C for 6 h in air. Powder X-ray diffraction pattern of the Al_2O_3-coated spinel LiMn_2O_4 showed that the Al_2O_3 coating medium was not incorporated in the spinel bulk structure. Scanning electron microscopy results showed that the Al_2O_3 coating particles were homogeneously distributed on the surface of LiMn_2O_4 powder particles. The Al_2O_3-coated LiMn_2O_4 retained 92.3% of its original capacity after 30 cycles, showing much better cycle ability than the bare lithium manganese oxide. The improvement of electrochemical performance is attributed to suppression of Mn^{2+} dissolution into electrolyte via Al_2O_3 layer.
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