Abstract
In order to improve the cycling performance of LiMn2O4, the spinel phases LiCo0.15Mn1.85O4 and LiCo0.05M0.1Mn1.85O4 (M = Ni, Zn, Cu) were prepared by the sol-gel method. Their structures have been investigated by x-ray diffraction. Electrochemical studies were carried out using the Li | Li x Mn2O4 (x = 1.05, 1.1), LiCo0.15Mn1.85O4, and LiCo0.05M0.1Mn1.85O4 (M = Ni, Zn, Cu) cells. The capacity loss of Li | Li x Mn2O4 (x = 1.05, 1.1) cells is about 21.7 and 6.4% after 30 cycles, whereas that for Co, Co-Ni, Co-Zn, and Co-Cu doped spinel materials is about 4.0, 2.0, 1.0, and 1.9%, respectively. The good capacity retention of LiCo0.05M0.1Mn1.85O4 (M = Ni, Zn, Cu) electrodes is attributed to stabilization of spinel structure by double metal doping for Mn ion sites. Double substituted spinels display better performance in terms of cycle-life compared with LiMn2O4.
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Şahan, H., Göktepe, H. & Patat, Ş. Synthesis and cycling performance of double metal doped LiMn2O4 cathode materials for rechargeable lithium ion batteries. Inorg Mater 44, 420–425 (2008). https://doi.org/10.1134/S0020168508040171
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DOI: https://doi.org/10.1134/S0020168508040171