Low temperature sintering of crystallized Li1.5Al0.5Ge1.5(PO4)3 using hot-press technique

The hot-press technique is applied to lower the sintering temperature and shorten the sintering process of Li1.5Al0.5Ge1.5(PO4)3 (LAGP). The hot-press conditions are studied to obtain well sintered LAGP pellet with high Li ion conductivity. The highest Li ion conductivity is obtained at 550 oC for 30 min at 7 MPa and the values are 3.8, 3.4 and 1.8×10-4 S cm-1 in bulk, grain-boundary and total conductivities, respectively. These values are comparable to reported values, however, sintering temperature is more than 250 oC lower and holding time is more than several hours shorter than conventional sintering processes.