High Performance Composite Lithium-Rich Nickel Manganese Oxide Cathodes for Lithium-Ion Batteries

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Li-1.0[Li1/7Mn4/7 Ni-2/7]O-2 cathode material was prepared by a facile, one-pot synthesis method. The structure of the material was determined by Rietveld refinement of structural models using high-resolution synchrotron X-ray and neutron powder diffraction data and was found to consist of two distinct phases. The major phase, with composition Li1.25(3)Ni0.17(1) Mn0.61(1)O2, close to the well-characterized L1.2Ni0.2Mn0.6O2 composition can be described as an intergrowth structure of Li2MnO3 and LiMn0.5Ni0.5O2 domains and the second phase is a lithium-deficient layered structure with refined composition Li0.85(1)Ni0.57(1)Mn0.55(1)O2. The composite cathode has a high initial discharge capacity of 250 mAh/g which drops to 225 mAh/g on the 2nd discharge cycle. This capacity is maintained on subsequent cycles. Time-resolved in-situ synchrotron XRD data was used to study the changes in the lattice parameters and phase evolution of the two phases during Li-insertion and extraction. © 2013, Electrochemical Society Inc.
Lithium, Nickel, Manganese, Electrodes, Oxides, Diffraction
Gummow, R. J., Sharma, N., Feng, R. S., Han, G. H., & He, Y. H. (2013). High performance composite lithium-rich nickel manganese oxide cathodes for lithium-ion batteries. Journal of the Electrochemical Society, 160 (10), A1856-A1862. doi:10.1149/2.093310jes