Effect of sintering conditions on the properties of sol-gel-derived Li_(1.3)Al_(0.3)Ti_(1.7)(PO4)3

摘要

Solid electrolyte Li_(1.3)Al_(0.3)Ti_(1.7)(PO4)3 was prepared by sol-gel method under different sintering conditions. The structural identification, surface morphology, electrochemical window, ionic conductivity, and activation energy of the Li_(1.3)Al_(0.3)Ti_(1.7)(PO4)3 sintered pellets were investigated by X-ray diffraction, scanning electron microscopy, cyclic voltammetry, and electrochemical impedance spectroscopy. It is found that the sintering temperature and time have considerable effect on the properties of the Li_(1.3)Al_(0.3)Ti_(1.7)(PO4)3 sintered pellets. The Li_(1.3)Al_(0.3). Ti_(1.7)(PO4)3 pellet sintered at 900 °C for 2 h is denser than the pellets sintered at other conditions. Different sintering conditions result in the sintered pellet with different porosity. However, the sintering conditions have little effect on the electrochemical window of Li_(1.3)Al_(0.3)Ti_(1.7)(PO4)3. Among the Li_(1.3)Al_(0.3)Ti_(1.7)(PO4)3 pellets sintered at various conditions, the pellet sintered at 900 °C for 2 h shows the highest ionic conductivity of 3.46X10~(-4) Scm~(-1) and the lowest activation energy of 0.2821 eV.