The Lithium-ion Batteries Anode Material Research Based On Graphene

ABSTRACT:Lithium-ion batteries as a new generation of energy supply equipment, has been widely used in the field of portable electronic device. However, in the study of the development of lithium-ion battery anode material, the existing limited capacity of the anode electrode, and the new anode electrode and there is significant capacity fading in the process of charging and discharging. In order to overcome these deficiencies and improve the reversible capacity of the lithium-ion battery anode material, this paper considers combining graphene with existing lithium-ion battery anode nanomaterials to overcome these deficiencies.1) The author gives the overview of the development of the lithium-ion battery, commonly used lithium-ion battery electrode material and their preparation methods, and the lithium-ion battery safety problems.2) The paper studies graphene charge carrier mobility abilities. The theoretical results of the graphene carrier mobility justify that the combining graphene into exisit ing anode material for lithium-ion batteries can greatly improve proformances.3) The paper explore the preparation and performances of the tin-based compounds/graphene nano-composite anode material for lithium-ion batteries, in order to find out the most outstanding performance of the tin-based materials compounds and its optimal nanomaterials morphology. According to the actual measurement result, the tin dioxide graphene nano-composite anode material has the best battery capacity and performance. The electrode material structure using nano spherical particle structure of the tin-based compound is significantly superior to the electrode performance of the nanowire structure.4) A silicon nano-particles graphene composite electrode of lithium-ion batteries is studied. Graphene can be effective as a good conductivity between the silicon nano-particles. The mechanical characteristics of the graphene can effectively alleviate the volume expansion of the silicon nano-particles in the battery charging and discharging process. The as-prepared silicon nano-particles graphene composite electrodes show great stable cycling performances.5) CU3O4/GNS nanocomposites are prepared and tested. The as-prepared CU3O4/GNS nanocomposites have a higher capacity and superior cycling performance. Finally, the conclusion and future works are briefly summarized in Chapter6.