Abstract
A series of Ni-Cu co-doped spinel LiMn1.92-xCu0.08NixO4 cathode materials were successfully synthesized by a solution combustion method. X-ray diffraction (XRD) spectra showed that all the as-prepared LiMn1.92-xCu0.08NixO4 samples belong to spinel LiMn2O4 structure without any impurity phase. Scanning electron microscopy (SEM) showed that the particle size of the samples decreased with the increase of Ni-doping amount, and the crystallinity increased gradually. The galvanostatic charge/discharge tests results showed that the LiMn1.86Cu0.08Ni0.06O4 sample shows excellent rate performance and cyclic stability. At room temperature and 1 C, the initial discharge specific capacity of LiMn1.86Cu0.08Ni0.06O4 was 103.4 mAh g-1, and the capacity retention rate of 67.80% was obtained after 1000 cycles, which was higher than 49.60% of LiMn2O4. Even at high current densities of 5 C and 10 C, the good capacity retention rates of 73.55% and 67.29% for LiMn1.86Cu0.08Ni0.06O4 sample were obtained after 1000 cycles, respectively.
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