The Investigation Of CaMoO₄-MoO₂/FSN-1 Anode Materials

With the development of society and the increasing demand of energy consumption,energy crisis and environmental pollution have become major problems faced by human society.Countries in the world consequently continue to explore new clean energy.Electricity is the clearest energy form in the world.However,it is difficult to store in large scale.Lithium ions batteries,as a device,could store electric energy in large scale.Lithium ions batteries are widely used in the fields of mobile phones,laptops,and electric vehicles.In this investigation,we focus on developing a new type of anode material for lithium ion batteries.The anode material is composed of CaMoO₄-MoO₂and flake graphite(FSN-1),which combines the characteristics of high specific capacity CaMoO₄-MoO₂and excellent electric conductivity of FSN-1.This investigation was based on the idea that FSN-1 act as a conductive scaffold.The CaMoO₄-MoO₂/FSN-1 composite materials are prepared in a facile two-step synthesis method.Various factors are investigated,such as calcination temperature and FSN-1 contents.The physical-chemical properties of the material are characterized by means of XRD,SEM,laser particle size analyzer,and specific surface area analyzer.The results show that the content of FSN-1 has a great impact on the capacity retention of anode material.When the content of FSN-1 is too low,the stability of the material is poor.Calcination temperatures have significant influence on the performances of the material.Higher calcination temperature enhances the crystallization of CaMoO₄-MoO₂.Additionally,higher temperature could enhance stickness between CaMoO₄-MoO₂and FSN-1.The investigation shows that the optimal calcination temperature is 600?.The material calcined at 600?demonstrated an initial discharge specific capacity of 978mAh/g and an initial charge specific capacity of 582 mAh/g(which is much higher than that of graphite(372 mAh/g)).A reversible specific capacity of 377 mAh/g can be achieved under the current density of 100 mA/g after 500 cycles.Even under 1000 mA/g,the anode material is capable of delivering a reversible capacity of 242 mAh/g.However,The electrochemical performance of the material decreased significantly with the further increasing of calcination temperature.When the calcination temperature reaches to 950?,the specific capacity decays to 270 mAh/g after 500 cycles at the current density of 100mA/g.The significant decadence is owing to the growing of CaMoO₄-MoO₂crystals,which reduce the diffusion rate.It can be seen that at an optimal calcination temperature of 600?,the reversible capacity and cyclic stability of the composite anode material are outstanding,and it is a practical material with an encouraging prospect.