Synthesis Of Li₄Ti₅O₁₂ And Their Electrochemical Properties

Spinel Li4Ti5O12has been considered as one of the most prospective anode materials for Li-ion batteries because of its stable charge and discharge platform, the zero-strain effect, excellent reversibility and long cycle life. But the low electronic conductivity and discharge capacity inhibits its popularization. Controlling particle size and other anode materials doping are effective ways to overcome these drawbacks.In this dissertation, Li4Ti5O12nanobelts, Li4Ti5O12-TiO2nanobelts and Li4Ti5O12-Li2TiO3nanobelts were synthesized by electrospinning. The physical and electrochemical properties of the synthesized samples were characterized by XRD, FE-SEM, CV, EIS and charge-discharge test, et al. Li4Ti5O12nanobelts exhibits an excellent electrochemical property. With the increase of Li/Ti, the electrochemical property of Li4Ti5O12-TiO2nanobelts is improved. With the loss of Li/Ti, the electrochemical property of Li4Ti5O12-Li2TiO3nanobelts is improved.The optimal calcination temperature of spinel Li4Ti5O12prepared by solvothermal is studied. The physical and electrochemical properties of the synthesized samples were characterized by XRD, FE-SEM, CV, EIS and charge-discharge test, et al. With the decrease of calcination temperature, the rate performance of Li4Ti5O12is improved.