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The Preparation Of Graphene/Fe3O4 Composites And Its Application In Anode Materials For Lithium Ion Batteries

Posted on:2015-12-04Degree:MasterType:Thesis
Country:ChinaCandidate:P LiFull Text:PDF
GTID:2311330485993747Subject:Materials science
Abstract/Summary:PDF Full Text Request
With the rapid development of modern society, the consumption of energy comes to increase, which leads to energy crisis intensified. So the research and development of efficient environmental energy has become urgent to solve the energy crisis. Based on the deficiencies of traditional cathode material of lithium-ion battery cathode material, explore the new materials with the advantages of stable performance,high specific capacity, fast charge and discharge capacity has been made.In this paper, the microstructures of graphene- ferroferric oxide?GS- Fe3O4?composites with the hydrothermal synthesis method has been controlled by adjusting preparation process, and then explore the impact of composite morphology on the electrical properties; The special three-dimensional microstructure of graphene and of Fe3O4 nanomaterials will give full play to synergistic effect, where the Fe3O4 on the composite has acquired uniform particle size, good crystal shape, so that the composite material recieved high specific capacity, stable structure, excellent rate performance.With FeCl3·6H2O as iron precursor, different kinds of process conditions has been changed in order to explore the influence on the performance of composites. To explore the influence of different reaction time, GS- Fe3O4 composites prepared with different reaction time of 5,8,16,24 hours respectively has been the analysised, in which the composite under reaction time of 16 h get optimal electrical properties;Exploring the effect of heat treatment, specific capacity of GS- Fe3O4 composite sintered 4 h under the condition of 400 ? high temperature in the argon gas has greatly reduced less than 50% compared with before, but relatively the cycle performance is more stable; Different surfactants on the properties of GS- Fe3O4 composite material, compared with no surfactant added, the morphology of GS-Fe3O4 composites which has been prepared with the surfactant PVP?molecular weight8000 and 58000 respectively?, CTAB and SDS, F127, are changed, while electric properties are also changed accordingly.With FeAc3 as iron precursor, many researches has been made to discover the different process conditions influence on morphology and electrical performance of the system for GS- Fe3O4 composites Compared with FeCl3·6H2O as precursor for composite materials, the nanostructures of GS- Fe3O4 composites with FeAc3 asprecursors is more stable, so that the materials have better storage capacity and good cycle stability for lithium battery., even the specific capacity after multiple loop has a rising trend. Ammonia?NH4OH? adding to explore the impact study of NH4OH, the specific capacity of material did not increase, but the cycle stability of the materials increased; To explore the impact study of glucose, specific capacity of material becomed lower after glucose doping, the cycle stability of the material increase at the same time.
Keywords/Search Tags:graphene, GS-Fe3O4 composites, hydrothermal method, lithium ion battery, anode materials
PDF Full Text Request
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