Morphology Control Synthesis And Electrochemical Properties Of Manganese-based Anode Materials For Lithium Batteries

In recent years,lithium-ion battery because of its high energy density,high power density,output energy stability,environmental protection and other advantages,has gradually become electronic products,power tools and pure electric / hybrid vehicles indispensable energy storage technology.In the lithium-ion battery,the anode material as an important part which its development has attract people's attention.At present,the development of new negative materials is much more important,because the theoretical capacity value?375 mAh / g?of graphite anode materials is too low to meet the application requirement.Compared to iron,cobalt,and nickel-based oxides in metal oxide,manganese-based oxides has been researched more and more for anode materials,because of their higher specific capacity,non-toxic,low cost and wide operating voltage?average discharge voltage and charge were 0.5 V and 1.2 V,respectively?.However,the application of the manganese-based material in anode electrode materials has been limited due to the large volume change,the lower conductivity,the lower coulomb efficiency and the severe voltage hysteresis.Therefore,it is necessary to construct the structural diversity of the manganese-based material.In this paper,1D MnOOH multilayer nanowires and different dimensionalities MnMoO₄ were synthesized.The formation mechanism of the final product morphology had been investigated by changing the reaction conditions.At last,the electrochemical performance of the prepared nanoparticles as anode materials for LIBs had been tested in this research.The main contents of this paper are as follows:1.Porous MnMoO₄ oxide was firstly synthesized by hydrothermal method and calcination process using manganese metal ion and molybdate.The oxide still retains the shape of the precursor.The prepared oxides were spherical porous structure with uniform particle size.The effect of the surfactant on the synthesis process was then discussed by changing the amount of surfactant,then different samples were used as anode materials for electrochemical performance testing.The difference between the cyclic properties of nanoparticles with the different morphologies and the structures was discussed and analyzed.2.The structural diversity for porous MnMoO₄ particales was designed by combined with the effect of organic ligands on the metal organic framework and the structure of polyoxometalates.The effect of octamolybdate and organic ligand on the structure of the final product was also investigated.the different affects on porous MnMoO₄ oxides which include dimensions,particle size,and surface structure,and make the electrochemicalperformance difference by different contents of organic ligand and octamolybdate.3.One-dimensional MnOOH multilayered nanowires were prepared by hydrothermal method.The formation mechanism of the multilayered structure was investigated by changing the hydrothermal reaction time and the different pH conditions.The electrochemical performance of the multilayers was tested.The results show that the prepared nanowires have high specific capacity and excellent cycling performance due to their multilayer structure and high dislocation density.