Synthesis and Electrochemical Performance of Mg-Doped Li(Ni_1/3Co_1/3Mn_1/3)_1–xMg_xO₂ Cathode Material for Lithium-Ion Battery

Abstract

Spherical Mg-doped Li(Ni_1/3Co_1/3Mn_1/3)_1–xMg_xO₂ (0 ≤ x ≤ 0.05) cathode materials were successfully synthesized by co-precipitation method. The influences of Mg-doped on the crystal structure and electrochemical performance were investigated. The results showed that all the samples exhibited α-NaFeO₂ structure as indicated by the XRD patterns. The undoped materials exhibited the initial discharge capacity of 170.8 mAh/g with capacity loss of 11.8% after 30 cycles. With the increase of the doped amount, the initial discharge capacity decreased to some extent, while the cyclic performances were improved obviously. When x was set to 0.015, the materials showed the best capacity retention, 93.2% after 30 cycles.

Keywords:

• Li(Ni_1/3Co_1/3Mn_1/3)_1–xMg_xO₂
• coprecipitation
• Mg-doped
• electrochemical performance
• spherical

Additional information

Funding

The financial support from CNOOC basic research program is gratefully acknowledged.