Magnesium oxide modified glass fiber composite electrolyte diaphragm as well as preparation method and application thereof

The invention discloses a magnesium oxide modified glass fiber composite electrolyte diaphragm which is obtained by uniformly coating magnesium oxide crystal grains on a supporting framework and then infiltrating and compounding by using molten salt, the supporting framework is made of glass fibers; the invention also discloses a preparation method and an application of the glass fiber composite material. The problems that a traditional magnesium oxide powder tabletting diaphragm is unstable in high-temperature structure and tedious in process, compared with a ceramic fiber diaphragm, the uniformity is poor, and compared with an asbestos fiber diaphragm, the thermal stability is poor are effectively solved, and the glass fiber diaphragm has better thermal stability, thermal shock resistance, use safety and environmental friendliness; the method can replace a traditional magnesium oxide powder tabletting process to prepare a thermal battery product which is good in safety, high in voltage platform and stable i