Study On The Performance Of Carbon Based Prepared From Farmland Wasteas Anode Materials For Lithium-ion Batteries

As a kind of anode material with good potential development,carbon material has a lot of advantages such as rich source,low price,good thermal stability,high security,large specific surface area,etc.In this paper,five carbon materials have been obtained from maize straws,peanut shells,walnut shells,orange peels and grapefruit peels by pyrolysis in high temperature.The results show that the carbon anode materials are obtained by different agricultural wastes have obvious differences in electrochemical properties.The carbon anode material prepared by pyrolysis of corn straw at high temperature is lamellar amorphous carbon,and it has better electrochemical performance.And then,the corn straw as carbon source,Mn O(X%)(X=10,30,50,70,90),Fex Oy(X%)(X=10,30,50,70)and Zn Cl2 anode materials have been synthesized with high temperature solid-phase method.Maize straws as the carbon source,and manganese acetate tetrahydrate(Mn C4H6O4·4H2O)as the main material,the Mn O(X%)@C(X=10,30,50,70,90)anode material was prepared by high temperature solid-phase method.The effects of different doping amounts of Mn O on the electrochemical properties of Mn O(X%)@C anode materials were investigated.The experimental results show that the carbon anode material with undoped Mn O has low specific capacity.With the increase of the doping amount of Mn O,the specific capacity at different rates of Mn O(X%)@C anode materials are roughly increased.The results show that the specific capacity of carbon anode materials can be greatly improved by doping Mn O.The analysis of XRD shows that the synthetic anode material is a complex of Mn O crystal and carbon.Maize straws and walnut shells as the carbon source,and Zn Cl2 is used as the pore forming material,the CZn Cl2(X%)anode material was prepared by high temperature solid state method.The experimental data shows that the higher doping amount of Zn Cl2,the better electrochemical performance of the prepared carbon anode material,and the CZn Cl2(40%)anode material has a high capacity retention rate,good rate performance,excellent cycle stability,minimum charge transfer resistance and Warburg resistance(Zw).Using maize straws as carbon source,adding different contents of ferric citrate(Fe C6H5O7·5H2O),the Fex Oy(X%)/C(X=10?30?50?70)anode material was prepared by high temperature solid-phase method,and the effect of Fex Oy content on the electrochemical performance of anode material is investigated.The analysis ofelectrochemical performance shows that with the increased of Fex Oy content,the capacity retention ratio and the discharge specific capacity under different current rate of anode materials gradually increased.This shows that the Fex Oy can be used as anode material for lithium ion batteries.The XRD result shows that the synthetic anode material is a complex of iron oxide and carbon.