Abstract
Single crystal LiNi1/3Co1/3Mn1/3O2 nanorods cathode material with diameter of about 250 nm have been successfully synthesized via a facile template method followed with heat-treatment, using single crystal β-MnO2 nanorods as self-template and Mn source. The structural changes of LiNi1/3Co1/3Mn1/3O2 nanorods during phase formation and first charge-discharge process are further explored by ex-situ XRD characterization, demonstrating the excellent structural reversibility for long cycling. The electrochemical measurements reveal that LiNi1/3Co1/3Mn1/3O2 nanorods exhibit excellent rate performance with a high discharge capacity of 100.5 mAh g−1 at 5 C. Particularly, the materials can deliver an excellent discharge capacity of 170.5 mAh g−1 with a capacity retention of 90.2% at 0.5 C after 200 cycles. The improved electrochemical properties are ascribed to the short Li-ion transport pathways along diameter direction, large surface-to-volume ratio and excellent strain relaxation of LiNi1/3Co1/3Mn1/3O2 nanorods, which could facilitate the diffusion of Li-ion and structural stability.
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