Effects of Al₂O₃ Coating on the Structural and Electrochemical Performance of LiNi_0.5Co_0.2Mn_0.3O₂ Cathode Material

Abstract:

The pristine LiNi_0.5Co_0.2Mn_0.3O₂ cathode material particles were successfully coated with Al₂O₃ via a heterogeneous nucleation process and subsequent heat-treatment. The structure and electrochemical properties of Al₂O₃-coated LiNi_0.5Co_0.2Mn_0.3O₂ were characterized by XRD and constant-current charge/discharge cycling tests. It was found that the Al₂O₃ coating did not alter the crystal structure of the cathode material. The Al₂O₃ coating layer had a negative influence on the dicharge specific capacity and a positive effect on the cycling performance. The decreased discharge capacity of the coated sample can be attributed to the poor clectronic and ionic conductivity of Al₂O₃ layer, which interfered the Li⁺ intercaltion/deintercaltion into/from the cathode material. The enhanced cycling performance can be ascribed to the suppression of the dissolution of transition metal ions by the HF acid in the eletrolyte and the side reations between electrode and electrolyte by the Al₂O₃ coating layer. The 2wt.% Al₂O₃-coated sample exhibits the optimal overall electrochemical performance, with discharge specific capacities of 157.0, 137.1 mAh/g at 0.2C and 3C rate, and capacity cycling retention rates of 97.34, 93.53% after 20 & 50 cycles, respectively.

• Periodical: Applied Mechanics and Materials (Volume 320)
• Pages: 235-240
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.320.235
• Online since: May 2013
• Authors: Kun Jian Cao, Li Wang, Lin Ci Li, Guang Chuan Liang
• Keywords: Al₂O₃ Coating, Cathode, Electrochemical Performance, LiNi_0.5Co_0.2Mn_0.3O₂, Lithium-Ion Battery

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