High capacity spherical Li[Li<inf>0.24</inf>Mn<inf>0.55</inf>Co<inf>0.14</inf>Ni<inf>0.07</inf>]O<inf>2</inf>cathode material for lithium ion batteries

Publication Type:
Journal Article
Citation:
Solid State Ionics, 2013, 233 pp. 12 - 19
Issue Date:
2013-01-21
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Li[Li0.24Mn0.55Co0.14Ni0.07]O2cathode materials with controlled spherical morphology and particle size in the range of 5-10 μm were synthesized by a modified co-precipitation method. The crystal structure of Li[Li0.24Mn0.55Co0.14Ni0.07]O2was investigated by Rietveld analysis of structural models using X-ray and neutron powder diffraction data, indicating the presence of Li2MnO3in the final product. Li[Li0.24Mn0.55Co0.14Ni0.07]O2shows low initial irreversible capacity loss (47.2 mAh/g), high reversible capacity (264.6 mAh/g), good capacity retention (90.4% over 50 cycles) and satisfactory rate capability when used as the cathode material in lithium ion batteries. X-ray photoelectron spectroscopy analysis of the pristine, charged and discharged electrodes of Li[Li0.24Mn0.55Co0.14Ni0.07]O2reveals that the Mn4 +/Mn3 +redox couple participates in the delithiation/lithiation process. Overall, the improved electrochemical performance of the Li[Li0.24Mn0.55Co0.14Ni0.07]O2electrode can be ascribed to the controlled and specially designed morphology and the composition of the sample that is produced by the co-precipitation method. © 2012 Elsevier B.V.
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