Prepration Of Graphene/Transition Metal Nitrides Compound Electrode And Their Electrochemical Performance

The rapidly growing business of portable electronics has stimulated the rapid development of lithium-ion batteries(LIBs)due to their high energy density,flexible design,and durable cycle performance relative to conventional battery technologies.To cater to the requirements of application,the exploration of new electrode materials with high capacity and excellent stability is crucial for high-performance LIBs.One major challenge in the development of LIBs is to find safe and cheap anode materials with large reversible capacity,desirable rate capability,and a long cycle life.Currently,graphene is regarded as the most commercial anode material owing to its good conductivity.However,some the disadvantages of graphene would significantly limit its wider application in desirable fields due to poor rate performance.Thus,it is imperative to develop new anode materials with enhanced Li+ storage performance and large capacity.Transition metal nitrides have aroused increasing interest due to their outstanding electrochemical properties,high chemical stability in recent years.And due to their high capacity and stability,transition metal nitrides hold great promise as anode for LIBs.In this article,we synthesized porous compound materials with graphene oxide and transition metal nitrides as anode material for LIBs.The morphology and electrochemical performance of different transition metals and graphene were discussed.The optimum experimental conditions of different transition metal and graphene composites were obtained by optimizing the experimental conditions such as the amount of metal doping,annealing temperature and annealing atmosphere.By introducing foam metal as three-dimensional framework substrate,a three-dimensional porous structure is formed,which enhances the mechanical properties and specific surface area of the composite.By introducing ammonia,porous structure(micron-millimeter)electrode materials were prepared.This structure not only has perfect mechanical properties but also can promote the contact between the active material and the electrolyte.The microstructure and electrochemical properties of the composites obtained under different conditions were characterized.The optimum reaction conditions for the preparation of graphene and transition metal nitride composites were determined.Compared with other porous electrode materials,the foam metal three-dimensional porous material has a better rate performance and cycle stability.When the current density increased from 0.1 A/g to 1.5 A/g,capacity of material can maintain more than 50%.The results indicated that the metal foam substrate can improve the stability of the composite material.The transition metal nitride and graphene composite hold great promise as anode for LIBs.Simultaneous,these works constitute the demonstration of employing in anodes material for LIBs.