| abstract |
PROBLEM TO BE SOLVED: To provide a solid electrolyte having excellent adhesion strength to an electrode active material layer, whereby a solid electrolyte having a good electrical contact state between the solid electrolyte, a positive electrode, and a negative electrode active material layer. Provide a secondary battery. SOLUTION: This is a solid electrolyte secondary battery including a positive electrode, a negative electrode, and a solid electrolyte interposed therebetween, wherein the solid electrolyte uses a fluorine-based polymer having a weight average molecular weight Mw of 550,000 or more as a matrix polymer. contains. The fluoropolymer having a weight average molecular weight of 550,000 or more exhibits excellent adhesion to the active material layers of the positive electrode and the negative electrode, and therefore has a sufficient adhesive strength between the solid polymer electrolyte or the gel electrolyte and the electrode active material layer. Joined. From the viewpoint of paint viscosity, weight average molecular weight Mw 300,000 or more, Less than 550,000 fluoropolymers may be used in combination. |