RGO-wrapped Iron Based Nanocomposites As Anode Material For Lithium Ion Battery

The rapid rise of commercial high-power applications and the harsh working environment of energy storage devices have imposed higher requirements for rechargeable batteries.Therefore,it is essential to develop electrode material with high power under wide operating temperature.Inorganic nanomaterial can be used as promising anode material due to their extensive sources and distinctive physical and chemical performance.This article focuses our interest on iron-base materials and combine with reduced graphene oxide?rGO?,which can be used as anode materials of power batteries operated under wide temperature range by means of their designed nanostructure.with high power and wide operating temperature range by means of their designed nanostructure.The structure and morphology of resultant materials were characterized by XRD,Raman,TGA,SEM,TEM.Galvanostatic cycling,CV and EIS were conducted to evaluate the electrochemical performances of nanocomposites.MnO@MnFe₂O₄ nanocomposites wrapped by rGO were obtained by thermal decomposition method using oleyl amine as solvent and reducing agent.Manganese?II?acetylacetonate and iron?III?acetylacetonate were served as precursors.By altering reactive conditions,we got the expected product,i.e.,MnO@3MFO@rGO,in which rGO content is 22.5 wt%,and the molar ratio of MnO and MnFe₂O₄ is 1 : 3.As anode material for lithium ion battery?LIB?,MnO@3MFO@rGO showed outstanding cycling performance and high temperature and current endurance: the reversible specific capacity was 587.8 mA h g^-1 after 200 cycles at 200 mA g^-1 at ambient temperature,and 1067 mA h g^-1 at 500 mA g^-1 at 60 ?.The mesoporous FeS₂@rGO nanocomposites were prepared via precipitation method,showing high temperature performance as anode material for LIB.The material presented a reversible specific capacity of 1720 mA h g^-1 after 700 cycles at 0.2 A g^-1 at room temperature,and 340 mA h g^-1 after 800 cycles at 5.0 A g^-1 at 85 ?.In addition,we found that,for the first time,a novel lithium storage mechanism during long term cycling,and then did preliminary exploration via CV test of electrodes after different cycles under ambient temperature and 85 ?.