Method for rapidly sintering solid electrolyte, compact solid electrolyte obtained by method and application of compact solid electrolyte

The invention relates to a method for rapidly sintering a solid electrolyte. The method comprises the following steps: pressing a sheet from solid electrolyte nanopowder; and providing a rapid sintering device with two pieces of carbon paper which are separated from each other, clamping the sheet between the carbon paper, electrifying the carbon paper to enable the carbon paper to generate Joule heat under the action of current, and conducting sintering by adjusting the temperature of the carbon paper to obtain the compact solid electrolyte. The invention also provides the compact solid electrolyte obtained according to the method. The invention also provides application of the compact solid electrolyte in a molten salt battery. According to the method for rapidly sintering the solid electrolyte, the Joule heat is generated by the cheap carbon paper under the action of the current, and the solid electrolyte sheet can be rapidly sintered by the Joule heat gathered in large quantity in a short time through heat