Copper oxide/reduced graphene oxide composites for improving long-term cyclic charge and discharge of high-capacity lithium-ion batteries

Copper oxide has attracted much attention in the field of anode materials for lithium-ion batteries because of its high capacity. However, in the long-term cyclic charge and discharge, due to the volume change, the electrode material is powdered, resulting in the rapid attenuation of capacity. In this paper, reduced graphene oxide is added to alleviate the volume problem of copper oxide charge and discharge, increase the contact area between active material and electrolyte, and finally improve the electrochemical performance of the material. Coated Copper oxide/reduced graphene oxide composites are synthesized by a one-pot method as anode materials for lithium-ion batteries. Herein, the morphology of the composite and the interface relationship in the reaction process have been systematically studied, and the relationship between the electrochemical properties of the composite and the composition ratio of the sample has been analyzed. The results indicate that the cycle capacity of the material increased first and then decreased with the increase of copper acetate content. When the content of copper acetate is 100 mg/140 ml, the cycle capacity reaches the highest and its value reaches 504 mAh g(-1). This result is circulated for 100 times at 200 mA g(-1) current density.