Preparation Of Transition Metal Iron Nickel Compound And Its Application In Anode Materials Of Lithium Ion Batteries

With the rapid development of science and technology,various types of electric vehicles and electronic communication devices have been widely used.As well known,the traditional energy materials are not recyclable and the generated products are harmful for the environment,which are not ideal choices.Therefore,it is urgent to design and develop battery materials with low raw material cost,low pollution and excellent electrochemical performance to replace traditional energy materials.Lithium ion battery materials have been widely regarded as promising energy materials.At present,the commercial negative electrode materials for lithium ion batteries in the market are mainly carbon-based graphite materials.The advantages of graphite as a negative electrode material are obvious such as stable material structure,strong reversibility of lithium ion migration,strong cycle.But the disadvantages for instance low material capacitance seriously hinders their development.As the research finds that transition metal oxides have the advantages of high capacitance as a negative electrode material,the material volume changes greatly during the lithium ion migration process,the material structure collapses easily,resulting in poor reversibility and poor cycle performance.The combination of carbon-based materials and transition metal oxide materials can just make up for each other's shortcomings.Therefore,carbon-based composite transition metal oxide anode materials have become a research hotspot for scientists.This paper introduces a method for preparing carbon composite transition metal oxide lithium battery anode material with simple preparation process,industrialization,low raw material price and low product contamination,and explores the electrochemical properties of the material.The carbon-based material in this paper is a laboratory-made liquid polyacrylonitrile?LPAN?.The low-polymerization liquid polyacrylonitrile will crosslink under a certain temperature to form a network structure,and finally form a graphene-like structure.The transition oxide is selected from iron oxide and nickel oxide.In this paper,three kinds of transition metal compound materials were prepared,which are iron compound anode material,nickel compound anode material and iron-nickel compound anode material.The main contents are as follows:?1?The carbon structure is formed by using self-made liquid polyacrylonitrile.The inexpensive iron oxide is used as the transition metal oxide,and the tannic acid is used as the surface modifier.The mass ratio is m?Fe₂O₃?wt.%=60%,70%,80%of iron compound anode materials,exploring three mass ratio composite materials under inert gas conditions,material calcination temperature conditions are 600?-4h,700?-4h,800?-4h.The productswere characterized by XRD,SEM and TEM,and its electrochemical properties were investigated.The mass ratio of raw materials was m?Fe₂O₃?wt.%=70%,and the calcination temperature was 700?-4h,the electrochemical properties of the composite was optimal.?2?The carbon structure is formed by using self-made liquid polyacrylonitrile,nickel oxide is used as the transition metal oxide,tannic acid is used as the surface modifier,and the mass ratio is m?NiO?wt.%=60%,70%,80%nickel compound anode material,explore the three mass ratio of composite material under inert gas conditions,material calcination temperature conditions are 600?-4h,700?-4h,800?-4h.The obtained product was characterized by XRD,SEM and TEM,and its electrochemical properties were investigated.The mass ratio of raw materials was m?NiO?wt.%=70%,and the calcination temperature was 700?-4h.Its electrochemical performance is optimal.?3?Based on the experimental results of?1?and?2?above,an iron-nickel compound anode material was prepared.Based on the total mass ratio of polyacrylonitrile to transition metal material of 3:7,the quality of iron oxide and nickel oxide was investigated.The electrochemical properties of the composites were 3:1,5:1,and 7:1,respectively.The products obtained by three mass ratio composite materials under inert gas conditions were calcined at 600?-4h,700?-4h,800?-4h,and the composites were XRD,SEM and TEM.Characterization.It is concluded that the total mass ratio of polyacrylonitrile carbon-based material to transition metal material is 3:7,the mass ratio of iron oxide to nickel oxide is 5:1,and the electrochemical performance of composite is optimal when the calcination temperature is 700?-4h.The comprehensive research found that this paper prepared a negative electrode material for lithium battery which is cheap in raw materials,simple in preparation process,small in environmental pollution,and can be used in industrial production.