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

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Şahan H., Göktepe H., Kılıç Dokan F., Aydın A., Veziroğlu S., Patat Ş.

Acta Physica Polonica A

2013

vol. 123

issue 2

368-370

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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1 Acta Physica Polonica A

1 2013

1 Aydın A.

1 Göktepe H.

1 Kılıç Dokan F.

1 Patat Ş.

1 Veziroğlu S.

1 Şahan H.

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