Synthesis, Structure and Electrochemical Performance of Titanium-doped Spinel Lithium Manganese Oxides

Abstract

Abstract: A series of titanium|doped lithium manganese oxides spinel samples were synthesized by using titanium-doped electrolytic manganese dioxide sample as the manganese sources. It is shown that the titanium|doped samples possess an excellent electrochemical performance whether for 40-charge-discharge-cycle or for second 40-charge-discharge-cycle with samples which stored in the discharged state for 3 months after 40 charge-discharge cycles. The titanium|doped sample synthesized at 600 ℃ possesses a discharge capacities of 206 mA·h/g in the 1st cycle and that of 144 mA·h/g in the 1st cycle after being stored. X-ray diffraction analysis showed that titanium|doped lithium manganese oxides possesses a cubic structure. The vibrational spectroscopic techniques(i.e. IR, Raman) were employed to investigate why titanium can obviously improve the electrochemical performance of spinel lithium manganese oxides.

Key words: Titanium, doped spinel lithium manganese oxides, Improved performance with doping, Stored performance, Vibrational spectra

CLC Number:

O614

TrendMD:

TONG Qing-Song, LIU Han-Shan, LIN Su-Ying, YANG Yong . Synthesis, Structure and Electrochemical Performance of Titanium-doped Spinel Lithium Manganese Oxides[J]. Chem. J. Chinese Universities, 2005, 26(1): 138.

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Synthesis, Structure and Electrochemical Performance of Titanium-doped Spinel Lithium Manganese Oxides

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