Abstract:

High-entropy oxides (HEOs), which are new class of single-phase solid solution materials, have recently attracted as electrode material due to their Li-ion storage properties. In this work Mg0.2Co0.2Ni0.2Zn0.2Li0.1Cu0.1O high entropy oxide was synthesized by conventional solid state method to evaluate its electrochemical performances as anode in the Li-ion battery. The structure of the synthesized Mg0.2Co0.2Ni0.2Zn0.2Li0.1Cu0.1O was characterized by using X-ray diffraction and field emission - scanning electron microscope techniques. The synthesized high entropy oxide was observed to have single phase rock salt crystal structure. The electrochemical performance of the anode was evaluated by assembling CR2016 type coin cell. Galvanostatic charge/discharge tests showed that the Mg0.2Co0.2Ni0.2Zn0.2Li0.1Cu0.1O anode delivers a high initial discharge capacity of 1668 mA h g-1 at a current of 200 mAg-1. The capacity cyclic stability was observed as also satisfactory. These performance values show that the Mg0.2Co0.2Ni0.2Zn0.2Li0.1Cu0.1O high entropy oxide has good potential to be used as anode in Li-ion batteries.

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