Study On Preparation Of Titanium Dioxide Anode Material For Lithium Ion Batteries

Lithium-ion battery has many advantages such as high energy density,high power density,low self-discharge rate,long cycle life,no memory effect,high volume and mass energy,wide temperature range,environment friendliness and so on,which has been widely used in the mobile communication,like notebook computers and other electronic equipment.Titanium dioxide has attracted much attention due to its high operating voltage?1.7V vs.Li/Li⁺?and good structural stability.In this paper,the series of materials were prepared by using titanium dioxide as the research object.The surface morphology and structure of the materials were characterized by XRD,SEM,BET,XPS and other methods,and they were assembled into batteries as negative materials.Their electrochemical performance had been tested.The main research contents are as follows:Firstly,TiO₂-B was synthesized by solvothermal method using titanium trichloride as titanium source and ethylene glycol as solvent.The results show that TiO₂-B has more excellent cycling stability and good rate performance than anatase.At 5C current density,the specific discharge capacity is maintained at about 147.5mAhg^-1.Secondly,titanium dioxide with different morphology were synthesized by solvothermal method using butyl titanate as titanium source,solvent?ethyl acetate,acetic acid and isopropanol?as growth aids.The results show that the cyclic stability of the samples are poor and the specific discharge capacity is 22.1,25.7 and 40mAhg^-1 after cycling at 5C.Finally,Cu²⁺ doped TiO₂ nanoparticles were prepared by simple one-step solvothermal method.Electrochemical test results show that doping can significantly improve the electrochemical properties of the material?the sample S-6wt%?.The first specific discharge capacity is 83.4mAhg^-1 at 5C current density,and the discharge capacity is still 76.5mAhg^-1 after 100 charge and discharge cycles,which has good cycle stability.