Synthesis and electrochemical performance of the high voltage cathode material Li[Li0.2Mn0.56Ni0.16Co0.08]O2 with improved rate capability |
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Authors: | J LiR Klöpsch MC StanS Nowak M KunzeM Winter S Passerini |
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Affiliation: | Institute of Physical Chemistry, University of Muenster, Corrensstr. 28/30, 48149 Muenster, Germany |
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Abstract: | The high voltage layered LiLi0.2Mn0.56Ni0.16Co0.08]O2 cathode material, which is a solid solution between Li2MnO3 and LiMn0.4Ni0.4Co0.2O2, has been synthesized by co-precipitation method followed by high temperature annealing at 900 °C. XRD and SEM characterizations proved that the as prepared powder is constituted of small and homogenous particles (100-300 nm), which are seen to enhance the material rate capability. After the initial decay, no obvious capacity fading was observed when cycling the material at different rates. Steady-state reversible capacities of 220 mAh g−1 at 0.2C, 190 mAh g−1 at 1C, 155 mAh g−1 at 5C and 110 mAh g−1 at 20C were achieved in long-term cycle tests within the voltage cutoff limits of 2.5 and 4.8 V at 20 °C. |
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Keywords: | Lithium-ion battery Cathode material Li[Li0 2Mn0 56Ni0 16Co0 08]O2 NMC Cycling performance Rate capability |
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