Xian Ming Wu

Preparation and characterization of LiMn2O4/Li1.3Al0.3Ti1.7(PO4)3/LiMn2O4 thin-film battery by spray technique

Solid-state thin-film lithium-ion battery of LiMn2O4/Li1.3Al0.3Ti1.7(PO4)3/LiMn2O4 is prepared by spray technique using Li1.3Al0.3Ti1.7(PO4)3 sintered pellet as both electrolyte and substrate. The thin-film battery is heat-treated by rapid thermal annealing. Phase identification, morphology and electrochemical properties of the sintered pellets and thin-film battery are investigated by X-ray diffraction, scanning electron microscopy, electrochemical impedance spectroscopy, cyclic voltammetry, and galvanostatic charge-discharge experiments, respectively. The results show that LiMn2O4 films with some pores are well deposited on the surface of Li1.3Al0.3Ti1.7(PO4)3 sintered pellet. The discharge current density and temperature have considerable effect on discharge capacity of the thin-film battery. LiMn2O4/Li1.3Al0.3Ti1.7(PO4)3/LiMn2O4 thin-film battery can be easily cycled with a capacity loss of 0.213% per cycle when 50 cycles are carried out.

Preparation and characterization of Li4/3Ti5/3O4/Ag composite prepared by sol-gel technique

The powders of Li4/3Ti5/3O4/Ag composite were prepared by sol-gel technique. Structural identification, surface morphology and electrochemical properties of the powders were studied by X-ray diffraction, scanning electron microscopy and galvanostatic charge-discharge experiments. The results show that Li4/3Ti5/3O4/Ag composite derived from sol-gel is a composite of Li4/3Ti5/3O4 and silver. Li4/3Ti5/3O4/Ag composite shows higher specific capacity, higher columbic efficiency and lower polarization than Li4/3Ti5/3O4. The addition of silver greatly improves the cycleability of Li4/3Ti5/3O4, especially at higher charge-discharge rate.