Zn-Doped LiNi1/3Co1/3Mn1/3O2 Composite as Cathode Material for Lithium Ion Battery: Preparation, Characterization, and Electrochemical Properties.

Zn-doped LiNi_1/3Co_1/3Mn_1/3O₂ composite, Li(Ni_1/3Co_1/3Mn_1/3)_1–xZn_xO₂ (x = 0.02; 0.05; 0.08), is synthesized by the sol-gel method. The crystal structure, morphology, and electrochemical performance are investigated via X-ray diffraction (XRD), scanning electron microscope (SEM), cyclic voltammetry (CV), and constant current charge/discharge experiment. The result reveals that Zn-doping cathode material can reach the initial charge/discharge capacity of 188.8/162.9 mAh·g⁻¹ for Li(Ni_1/3Co_1/3Mn_1/3)_0.98Zn_0.02O₂ and 179.0/154.1 mAh·g⁻¹ for Li(Ni_1/3Co_1/3Mn_1/3)_0.95Zn_0.05O₂ with the high voltage of 4.4 V at 0.1 C. Furthermore, the capacity retention of Li(Ni_1/3Co_1/3Mn_1/3)_0.98Zn_0.02O₂ is 95.1% at 0.5 C after 50 cycles at room temperature. The improved electrochemical properties of Zn-doped LiNi_1/3Co_1/3Mn_1/3O₂ are attributed to reduced electrode polarization, enhanced capacity reversibility, and excellent cyclic performance. [ABSTRACT FROM AUTHOR]