Superior Stability and Dynamic Performance of Single Crystal LiNi1/3Co1/3Mn1/3O2 Nanorods from β-MnO2 Template for Lithium-Ion Batteries

• Published in: Journal of the Electrochemical Society 2019-01, Vol.166 (2), p.A59-A67
• Main Authors: Zhou, Huijie, Cheng, Hongwei, Zhao, Hongbin, Zhao, Kangning, Zhao, Yufeng, Zhang, Jiujun, Xu, Qian, Lu, Xionggang
• Format: Article
• Language: English
• ISSN: 1945-7111
• DOI: 10.1149/2.0281902jes

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.