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Li 1.27 Cr 0.2 Mn 0.53 O₂ layered cathodic materials were prepared by a nanomilling-assisted solid-state process. Whole-pattern refinement of X-ray diffraction (XRD) data revealed that the samples are solid solutions with layered α-NaFeO₂ structure. SEM observation of the prepared powder displayed a mesoporous nature composed of tiny primary particles in nanoscale. X-ray photoelectron spectroscopy (XPS) studies on the cycled electrodes confirmed that triple-electron-process of the Cr 3+ /Cr 6+ redox pair, not the two-electron-process of Mn redox pair, dominants the electrochemical process within the cathode material. Capacity test for the sample revealed an initial discharge capacity of 195.2 mAh·g -1 at 0.1 C, with capacity retention of 95.1% after 100 cycles. EIS investigation suggested that the high Li ion diffusion coefficient (3.89 × 10 -10 ·cm²·s -1 ), caused by the mesoporous nature of the cathode powder, could be regarded as the important factor for the excellent performance of the Li 1.27 Cr 0.2 Mn 0.53 O₂ layered material. The results demonstrated that the cathode material prepared by our approach is a good candidate for lithium-ion batteries.

Enhanced Electrochemical Performance of Li1.27Cr0.2Mn0.53O2 Layered Cathode Materials via a Nanomilling-Assisted Solid-state Process