The Preparation Of Cu_xO/rGO Composites And Its Application In The Sodium Ion Batteries

With the continuous development of international society,the dependence and the demand of lithium resources for people are increasing.The rapid development of lithium-ion battery industry caused a sharp reduction in lithium resources,and due to its uneven distribution of storage,resulting in the lack of lithium resources.In order to solve this problem,scientists are actively looking for alternative electrode materials.Sodium as the main group with lithium,the chemical and physical properties and are very similar with lithium.And sodium in the crust of storage capacity is about 2.74%which is much higher than lithium.So using sodium-ion battery to replace the lithium-ion battery can be a good to solve the current shortage of lithium resources.But there are two main shortcomings that can not be ignored to constrain its application in industry:?1?the theoretical ratio of sodium element is small,less than 1/2 of lithium;?2?sodium-ion radius is larger than lithium-ion radius?about 55%?,so the current development of sodium batteries is to develop high performance,reversible embedded anode electrode material.In recent years,researchers working on new sodium-ion battery anode materials,sodium-ion radius is too large to make the graphite can not be applied in the sodium-ion battery anode.While the graphene material has a larger interlayer spacing that can provide space for reversible deintercalation of sodium ions.But capacity of graphene is low,so we use the high capacity and low price of CuxO compound with GO to improve the capacity of grapheme.At the same time,graphene can alleviate the volume expansion of CuxO during the cycle.Therefore,we combine the two materials to prepare the new sodium ion battery anode materials.In addition to the combination of graphene,CuxO package carbon can also alleviate the problem of volume expansion during the cycle,while the carbon material is well conductive,and thus the composite material can have a good performance.In the process of preparation of Cu₂O/rGO composite materials,Cu₂O/rGO hydrogels were synthesized by hydrothermal method using copper acetate and GO as synthesis materials.In this paper,by controlling the amount of time,temperature and copper source for the influence of the morphology,structure and electrochemical properties of materials.The best performance was 247.3 mA h/g after 100 cycles under the current density of 50 mA/g.In the process of preparation of CuO/rGO composite materials,CuO/rGO composites were synthesized by water bath method in 83? using copper acetate and GO as synthetic materials,isopropyl alcohol as the solvent and the reaction of reducer.In this paper,by controlling the amount of time and copper source for the influence of the morphology,structure and electrochemical properties of materials.The best performance was 207.3 mAh/g after 100 cycles under the current density of 50 mA/g.In the process of preparation of Cu₂O/C composite materials,Cu₂O/C composites were synthesized by hydrothermal method using copper acetate and glucose as carbon source.In this paper,by controlling the amount of copper source for the influence of the morphology,structure and electrochemical properties of materials.The best performance was 204.4 mAh/g after 100 cycles under the current density of 50 mA/g.In the process of preparation of CuO/C composite materials,CuO/C composites were synthesized by hydrothermal method using copper acetate and PVP as carbon source.In this paper,by controlling the amount of copper source for the influence of the morphology,structure and electrochemical properties of materials.The best performance was 238.1mA h/g after 100 cycles under the current density of 50 mA/g.