Abstract
Spinel phase LiAlxMn2-xO4 were prepared by a rheological phase reaction method. The samples were characterized by X-ray diffraction, scanning electron microscopy, AC impedance, and galvanostatic charge/discharge profile measurement. These results showed that the LiAlxMn2-xO4 had better cycling performance than pure LiMn2O4. Among all the doped samples, the LiAlxMn2-xO4 sample showed the best cycling performance, the initial discharge capacitiy is 132 mAh g−1, and the discharge capacity of 115 mAh g−1 at a rate of 1 C after 100 cycles and capacity retention of 87.1% after 100 cycles (1C=148 mA g−1). Rate performance and electrochemical impedance spectroscopy measurements showed that the Al-doped spinels had high rate capability and reversible cycling performance.
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