Preparation Of CuO Hierarchical Structures And Its Applications In Lithium-ion Batteries

With the rapid development of portable electronic equipment,electric vehicles and large energy storage systems,the existing rechargeable lithium-ion batteries can not meet the needs of the development of diversified applications.As an important component of Li-ion battery,anode material has been the main research direction of researchers.At present,the metal oxide has become the main research object.In the TMOs,CuO has been widely used as a functional material because of its abundant reserves,low cost,good safety performance,high theoretical capacity,no pollution and no toxicity.CuO has become a leader of anode materials of new Li-ion battery.In this paper,We successfully prepared CuO hierarchical structures,the use of PVP as a surface active agent,ammonia and copper nitrate reaction.And the morphology and structure of the samples were characterized by modern technology.From the results analysis,the optimized 3D hierarchical architectures are composed of inter-crossed 2D nanosheets,which not only possess good robustness to ensure cycling stability through 3D assembly but also provide large electrode–electrolyte contact area and shorten lithium-ion diffusion via exposed 2D nanosheets(The specific surface area is about 27.0 m² g^-1).This unique stable structure provides high reversible capacity and excellent cycling stability.When evaluated as anode in lithium-ion batteries,CuO hierarchical structures exhibit high discharge capacities of 575 mA h g^-1 at 1C over 100 cycles and 504 mA h g^-1 at 2C over 100 cycles respectively,which were much better than those of calcined ones in this studies.The results of this experiment may provide valuable help for the next generation of high-performance lithium-ion batteries.