Synthesis, structure and electrochemical performance of titanium-doped spinel lithium manganese oxides
- 化学化工－已发表论文 
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 600degreesC 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. Xray 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.