The application relates to a diaphragm and an electrochemical device and an electronic device comprising the same, and belongs to the technical field of
electrochemical energy storage. The diaphragm provided by the application comprises a diaphragm base material and a
solid-state
ion source layer arranged on at least one side of the diaphragm base material, the
solid-state
ion source layer comprising
lithium salt, a functional additive and an
ion conductor composite, the ion conductor composite comprising a binder and an ion conductor; the
lithium salt comprises at least one of
lithium bisfluorosulfonylimide, lithium bis-trifluoromethanesulfonylimide, lithium difluoro(oxalato)borate,
lithium tetrafluoroborate and lithium bis(oxalato)borate. The diaphragm provided by the application can be matched with a non-solute and low-
viscosity electrolyte, the
liquid injection time in preparation is reduced, the controllable release of lithium salt is realized, and the cycle stability and safety performance are improved.