Synthesis And Modification Study On Red Phosphorus Anode Materials For Rechargeable Lithium Batteries

With the developmnt of social,the situation of energy and environment is danger,developing a new energy power is necessarily task?ithium-ion battery has become a hot spot of energy storage equipment in the world because of its high energy density,long cycle lifetime,good thermal stability and no pollution.It has a broad application prospect in electric vehicles,portable electronic equipment,space aviation and so on.Red phosphorus?P?have been considered as one of the most promising anode material for lithium-ion batteries?LIBs?,because of its high natue abunanc,low cost and high theoretical capacity(2596 mAh g^-1)?However,natural insulating property and the large volume expansion of red P during cycling lead to poor cyclability and low rate performance,which prevents its practical application.According to the characteristics of red phosphorus,Ketjenblack as carbon source,explor the effects of different synthetic methods and red phosphorus content on the properties of the composite,by further modified by reducing graphite oxide to improve the electrochemical performance.give the main result as follows;1.The RP/KeC composite with red phosphorus content of 60%by evaporation-deposition,red phosphorus diffuse into the pores of Ketjenblack by SEM and TEM.It was found that the P-C bond was formed during the preparation by XPS and Raman,which indicates that the red phosphorus has not only physical adsorption but also P-C bond chemical adsorption,which makes the structure of RP/KeC composite more stable and shows the best electrochemical performance.Base on the mass of the composite,the current density at 0.1 A g^-1,the first charge specific capacity is 1746 mAh g^-1,and 798.5 mAh g^-1 after 100cycle.2.The characteristics of flexible and scalable with the three dimensional porous reduced graphite oxide?RGO?,and a multi-layer structure of RP/KeC composite-reduced graphite oxide?RP/KeC-RGO?is constructed,which shows excellent electrochemical performance compared with RP/KeC.Within the 0.01 V-2.0 V voltage range,the first chage specific capacity RP/Ke C-RGO based on the mass of coposite is 1700 mAh g^-1,1040 mAh g^-1 after 200 cycles at 0.1 A g^-1.At the same time,RP/KeC-RGO exhibits excellent cycling performance and rate performance.