High capacity spherical Li[Li0.24Mn0.55Co0.14Ni0.07]O2 cathode material for lithium ion batteries

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Elsevier Science BV
Li[Li0.24Mn0.55Co0.14Ni0.07]O-2 cathode materials with controlled spherical morphology and particle size in the range of 5-10 mu m were synthesized by a modified co-precipitation method. The crystal structure of Li[Li0.24Mn0.55Co0.14Ni0.07]O-2 was investigated by Rietveld analysis of structural models using X-ray and neutron powder diffraction data, indicating the presence of Li2MnO3 in the final product. Li[Li0.24Mn0.55Co0.14Ni0.07]O-2 shows 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]O-2 reveals 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]O-2 electrode can be ascribed to the controlled and specially designed morphology and the composition of the sample that is produced by the co-precipitation method. © 2013, Elsevier Ltd.
Lithium, Oxygen, Cobalt, Morphology, Nickel, Diffraction
Wang, Y., Sharma, N., Su, D. W., Bishop, D., Ahn, H., & Wang, G. X. (2013). High capacity spherical Li[Li0.24Mn0.55Co0.14Ni0.07]O2 cathode material for lithium ion batteries. Solid State Ionics, 233, 12-19. doi:10.1016/j.ssi.2012.12.003