The Research Of Metal Oxide-carbon Fiber Network Preparation And Lithium Storage Performance

During the past two decades, lithium-ion batteries (LIBs) with the advantages of high energy density, high specific capacity and light quality, have drawn much attention by many scientists. LIBs are widely used in mobile phones, tablets, laptops and other small electronic products, but they still cannot meet with the growing demand for higher power density, energy density and longer cycle life. So the next decade, it will be the hot-pot of batter research. As the critical factors of rechargeable LIBs, the electrode material is the key for LIBs to meet urgent needs. This paper is focused on lithium-ion battery anode:carbon-based cathode materials, tin and cobalt-based composite.Firstly, it describes operating principle of LIBs and the structure of cylindrical batters. The carbon-based anode materials, including graphite carbon, amorphous carbon, and carbon nano-graphene are reviewed in detail. Then, it introduces the synthesis method and morphology of cobalt-based anode materials, as well as the carbon-modification strategy of cobalt oxide. In addition, it focuses on the modification of tin-based anode materials, including nano-particles of tin oxide, tin oxide hollow structure, carbon-coated tin oxide, tin oxide and carbon fiber modified graphene modified tin oxide.Secondly, chapter two introduces the structure, lithium storage mechanisms, synthesis, and modification of cobalt oxide, graphene and carbon fiber. The graphene not only can adjust the size of the nanoparticles and improve the conductivity of the electrode, but also its electrochemical properties.At last, stannous ion reducing graphene oxide to grapheme, electrospinning, and subsequently thermal treatment were employed to synthesis SnOx-graphene-carbon fiber flexible mats.The as-prepared 4 nm SnOx nanoparticles, including tin oxide and stannous oxide, are embedded in a matrix of carbon fibers and graphene, which alleviates the volume expansion and contracts of the metal oxide in the lithium ion intercalation/deintercalation, and prevents the agglomeration of metal oxide nanoparticles. Graphene and carbon fibers can optimize the electron transfer channels, improve the electronic conductivity and the properties of lithium-ion batteries.