Abstract
Li1.1Mn2 − 2x Co x Ni x O4 (x = 0, 0.075) spinel powders were successfully synthesized using a liquid stirred tank reactor method. The electrochemical performances of the undoped and doped spinels at 4.3 and 5 V were investigated by X-ray diffraction, field-emission scanning electron microscopy, and electrochemical impedance spectroscopy. The capacity of Li1.1Mn2 − 2x Co x Ni x O4 could be divided into two parts, with 4.3 V as the dividing line in the 3–5 V charge–discharge range. Low capacity and good cyclic performance were obtained when cycled in the 3–4.3 V range for the multi-doped Li1.1Mn2 − 2x Co x Ni x O4 spinel. In comparison with multi-doped spinel at 4.3 V, the results of the cyclic performance worsened at 5 V because the structure underwent further shrinkage, the charge transfer resistance rose and the electrolyte decomposed.
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This work was financially supported by the National High-Tech Research and Development (863) Plan of China (no. 2011AA11A230).
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Liu, J., Sun, Z., Xie, J. et al. Study of electrochemical performances of multi-doped spinel Li1.1Mn1.85Co0.075Ni0.075O4 at 4.3 and 5 V. Ionics 19, 1867–1874 (2013). https://doi.org/10.1007/s11581-013-0920-3
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DOI: https://doi.org/10.1007/s11581-013-0920-3