Study On The Li-ion Solid-state Electrolyte And Thin-film Battery Of LiMn₂O₄/Li_1.3Al_0.3Ti_1.7（PO₄）₃/Li₄Ti₅O₁₂

Thin film lithium ion battery is a kind of thin film, miniaturization, multi-functional lithium ion batteries, and it can be applied to a smart card, micro devices, sensons, integrated circuit, so it causes people’s attention. But, thin-film batteries are mainly prepared on the other substract and substract, making its process complex and its cost higher. To solve the problem, the solid electrolyte Li1.3Al0.3Ti1.7(PO4)3 and the sintered substrate were studied and the thin-film battery LiMn2O4/Li1.3Al0.3Ti1.7(PO4)3/Li4Ti5O12 were synthesized.The phases and features of the prepared materials were investigated by X-ray diffraction and scanning electron microscope,The electrochemical performance of the prepared material was tested by electrochemical impedance and constant current charge-discharge.The solid electrolyte Li1.3Al0.3Ti1.7(PO4)3 was synthesized by high temperature solid phase method. The phases and features of the prepared materials were investigated by X-ray diffraction and scanning electron microscope, The electrochemical performance of the prepared material was tested by electrochemical impedance. The results show that the Li1.3Al0.3Ti1.7(PO4)3 prepared at 900 ℃is pure phase and the size of particles is uniformity. Among the Li1.3Al0.3Ti1.7(PO4)3 substrates, the one sintered at 900 ℃for 4 h shows the highest ionic conductivity of 3.07×10-4S/cm.The sintering process of the Li1.3Al0.3Ti1.7(PO4)3 substrates were studied, and the best sintered process were discussed. The phases and features of the prepared materials were investigated by X-ray diffraction and scanning electron microscope,The electrochemical performance of the prepared material was tested by electrochemical impedance. The results show that the substrate of Li1.3Al0.3Ti1.7(PO4)3 electrolyte sintered 4h under 900℃ is the most density and the most smooth surface, and the highest ionic conductivity of 3.03 x 10-4S/cm.The Li1.3Al0.3Ti1.7(PO4)3 prepared under 900℃ for 10 h by adding different mass fraction of vitreous were studied. The phases and features of the prepared materials were investigated by X-ray diffraction and scanning electron microscope, The electrochemical performance of the prepared material was tested by electrochemical impedance. The results show that the crystalline and compactness of Li1.3Al0.3Ti1.7(PO4)3 substrate are perfect by adding 2wt.% of vitreous and the one sintered 3h under 700℃ shows the highest ionic conductivity of 1.39 x 10-4S/cm.The thin-film lithium ion batteries LiMn2O4/Li1.3Al0.3Ti1.7(PO4)3/Li4Ti5O12 using Li1.3Al0.3Ti1.7(PO4)3 for electrolyte and substrate were synthesized by spray pyrolysis method. The phases and features of the prepared materials were investigated by X-ray diffraction and scanning electron microscope,The electrochemical performance of the prepared batteries were tested by constant current charge-discharge and cycle performance. The results show LiMn2O4 and Li4Ti5O12 are deposited on the Li1.3Al0.3Ti1.7(PO4)3 substrate; the thin-film batteries have high charge and discharge voltage(2.4V) and broad platform for the charge and discharge voltage, and good cycle performance. Capacity attenuation is only 4.16% after 40 cycle numbers.