Zn‐Doped LiNi_1/3Co_1/3Mn_1/3O₂ Composite as Cathode Material for Lithium Ion Battery: Preparation, Characterization, and Electrochemical Properties

Abstract

Zn‐doped LiNi 1/3 Co 1/3 Mn 1/3 O 2 composite, Li(Ni 1/3 Co 1/3 Mn 1/3 ) 1– x Zn x O 2 ( 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 1/3 Co 1/3 Mn 1/3 ) 0.98 Zn 0.02 O 2 and 179.0/154.1 mAh·g −1 for Li(Ni 1/3 Co 1/3 Mn 1/3 ) 0.95 Zn 0.05 O 2 with the high voltage of 4.4 V at 0.1 C. Furthermore, the capacity retention of Li(Ni 1/3 Co 1/3 Mn 1/3 ) 0.98 Zn 0.02 O 2 is 95.1% at 0.5 C after 50 cycles at room temperature. The improved electrochemical properties of Zn‐doped LiNi 1/3 Co 1/3 Mn 1/3 O 2 are attributed to reduced electrode polarization, enhanced capacity reversibility, and excellent cyclic performance.