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The Effect of Multiple Cation (Al, Si, Ti, Co) Doping on Electrochemical Performance οf LiMn_2O_4 Cathode Active Material

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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.
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Improvement of Cycling Stability of LiMn_2O_4 Cathode by Al_2O_3 Surface Coating for Li-Ion Batteries

100%
Şahan H., Göktepe H., Kılıç Dokan F., Aydın A., Veziroğlu S., Patat Ş.
Acta Physica Polonica A
|
2013
|
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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