Abstract
The surface-modified spinel LiMn 2O 4 by doped LiNi 0.05Mn 1.95O 4 was prepared by a tartaric acid gel method. Transmission electron microscope (TEM) images indicated that some small particles with 100–200 nm in diameter modified the surface of large particle LiMn 2O 4. Energy dispersive spectrometry (EDS) showed that the particles were LiNi 0.05Mn 1.95O 4. Electrochemical properties of LiNi 0.05Mn 1.95O 4-modified spinel LiMn 2O 4 were intensively investigated by the galvanostatic charge–discharge tests, cyclic voltammetry (CV) and AC impedance measurements. The doped LiNi 0.05Mn 1.95O 4-modified LiMn 2O 4 cathode delivered the same initial discharge capacity as the unmodified LiMn 2O 4, but its cyclic stability was evidently improved, the capacity retention ratio reached 96% after 20 cycles, being higher than 89% of the unmodified LiMn 2O 4. Cyclic voltammograms of the LiNi 0.05Mn 1.95O 4-modified LiMn 2O 4 did not markedly change while the semicircle diameter of AC impedance spectra evidently decreased after 20 cycles, which showed that the surface modification with LiNi 0.05Mn 1.95O 4 improved the electrochemical activity and cycling stability of LiMn 2O 4.
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