Effect of Mg doping and MgO-surface modification on the cycling stability of LiCoO2 electrodes |
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| Institution: | 1. Central Laboratory of Electrochemical Power Sources, Bulgarian Academy of Sciences, 1113 Sofia, Bulgaria;2. Institute of General and Inorganic Chemistry, Bulgarian Academy of Sciences, 1113 Sofia, Bulgaria;1. School of Chemistry and Environment, South China Normal University, Guangzhou 510006, PR China;2. R&D Centre, Dongguan McNair New Power Co., Ltd, Dongguan, Guangdong 523000, PR China;3. Hunan Shanshan Energy, Changsha 426100, PR China;1. College of Materials Science and Opto-Electronic Technology, University of Chinese Academy of Sciences, Beijing 100049, PR China;2. Department of Nuclear Physics, China Institute of Atomic Energy, Beijing 102413, China;1. Institute of Energy Resources, Hebei Academy of Sciences, Shijiazhuang, Hebei Province 050081, PR China;2. College of Chemistry and Material Science, Hebei Normal University, Shijiazhuang, Hebei 050024, PR China;3. School of Chemical Engineering and Technology, Hebei University of Technology, Tianjin 300000, PR China;1. Department of Physics, University of Puerto Rico, Mayaguez 00681, Puerto Rico;2. Department of Physics, University of Puerto Rico, Rio Piedras 00931-3343, Puerto Rico |
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| Abstract: | Two synthetic routes including Mg doping and MgO-surface modification were applied to the preparation of LiCoO2 showing enhanced reversible cycling behaviour as cathode material in lithium ion batteries. Mg-doped LiCoO2 was obtained by the citrate precursor method in the temperature range 750–900°C. The surface of LiCoO2 was modified by coating with Mg(CH3COO)2 and subsequent heating at 600°C. XRD, chemical oxidative analysis and electron paramagnetic resonance (EPR) of Ni3+ spin probes were used to characterize the Mg distribution in LiCoO2. Substitution of Co by Mg in the CoO2-layers was found to have a positive effect on the cycling stability, while Mg dopants in LiO2-layers did not influence the capacity fade. The accumulation of MgO on the surface of LiCoO2 improves the cycling stability without loss of initial capacity. |
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