Abstract
Spinel phase LiMn1.95M(x)O(4-y)F(y) (M = Co and Y) 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 LiMn1.95M(x)O(4-y)F(y) had better cycling performance than pure LiMn2O4. Among all the doped samples, the LiMn1.95Co0.03Y0.02O3.96F0.04 sample showed the best cycling performance, the initial discharge capacitiy is 129 mAh/g, and the discharge capacity of 124 mAh/g at a rate of 0.5 C after 50 cycles. The loss of its capacity was only 3.4%. The possible reasons for the outstanding electrochemical properties of LiMn1.95Co0.03Y0.02O3.96F0.04 are also discussed.
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