Preparation And Performance Of The Anode Materials For Lithium-ion Batteries With Carbon Networks As Substrates

The increasing energy consumption in the world calls for the development of energy conversion and storage equipment with higher energy density and better rapid charge discharge performance.Lithium ion batteries(LIBs)have many excellent properties,including high energy density,no memory effect,low cost and little self discharge,so they become the ideal power supply for portable electronic products such as mobile phones and laptops.Nowadays,the rapid development of electric vehicles puts forward higher requirements for LIBs,so the development of LIBs electrode materials with excellent performance has become the current research hotspot.In this paper,a new type of LIBs anode material with good electrochemical performance was prepared by using the carbon based network structure with good conductivity and structural stability as a substrate for transition metal oxides nanostructures.Theoretically,Ni O has a capacity value of 718 m Ah/g,and has the advantages of high chemical stability,low cost,and friendly environment.It is an ideal anode material for LIBs.However,the electrical conductivity of Ni O is poor,and it will suffer a large volume change during the charge-discharge process,which will cause the fast capacity fading.Carbonized filter paper(CFP)is treated with a more efficient Zn Cl2 activation process.After being activated by Zn Cl2,the hydrothermally prepared Ni O nanosheets will be rooted on the surface of CFP.The strong combination between Ni O nanosheets and CFP achieves the excellent electrochemical performance of the Ni O nanosheets @ CFP composite.Its capacity after 100 cycles at a current density of 100 m A/g is 724 m Ah/g,and there is no significant capacity decay during cycling.CoO has a relatively high electrochemical capacity in theory and is a new generation ideal high-capacity lithium-ion battery anode material.However,Co O has poor conductivity;and during the charge and discharge process,the electrode material morphology will change dramatically,causing its capacity to decrease rapidly.To solve this problem,carbon cloth,carbon nanotubes and graphene are used as carriers to improve the electrochemical performance of transition metal oxides including Co O.Melamine foam has a three-dimensional network structure and its price is low.In this paper,the Co O-carbonized melamine foam composite was prepared with carbonized melamine foam as the substrate.The effect of different hydrothermal reaction temperature on its morphology and properties was investigated.The best hydrothermal reaction temperature is 120?.The Co O-carbonized melamine foam composite synthesized at this temperature has the best electrochemical performance.In this paper,filter paper and melamine foam were used as raw materials to obtain carbon based materials with three-dimensional network structure by simple calcination process.The preparation technology has some merits such as low cost of raw materials,simple routes and large-scale preparation.The Ni O nanosheets @ CFP and Co O @ carbonized melamine foam deliver excellent performance.Therefore,the technology and the anode materials prepared in this paper have good industrial application.