Synthesis, Modification And Electrochemical Properties Of Li₄Ti₅O₁₂ Anode Material For Lithium-ion Battery

The negative-electrode materials are usually carbon in commercial lithium ion batteries. However, the main drawback for carbonaceous materials is the passivation film formed during the first charging, which consumes lithium from the cathode. And there is still some safty concern. Li₄Ti₅O₁₂ is a promising anode material for lithium-ion batteries. During the process of Li+ intercalation and de-intercalation, its crystal form does not change and the total volume change is less than 1%, so it is regarded as a"zero strain"material. The lithium ion battery using Li₄Ti₅O₁₂ material as anode material has excellent reversibility, and the safety and reliability of the material is improved compared with that of carbon electrodes, such as graphite. Therefore, the lithium ion battery using Li₄Ti₅O₁₂ material as anode material is suitable for electric vehicle (EV) and power storage battery, and the material is also adopted as the anode active material for all-solid lithium battery. During the past years, spinel Li₄Ti₅O₁₂ anode material has attracted substantial research interests of many scientists. It has been demonstrated that the electrochemical properties of them could be improved in a controllable way by altering their particle sizes or morphology. In this dissertation,valuable researches have been carried out to the investigation of new synthetic methods in solution phase,and controlled syntheses of spinel Li₄Ti₅O₁₂ material. And in order to investigate new anode material which possessed higher specific capacity and lower voltage, a serious of Li4Ti5-xMxO12(M=Cr,Mn,Ni,Co) and Li₄Ti₅O₁₂/ SnO2 composite material were synthesized and investigated.In the first chapter, the current survey on the lithium ion batteries anode...