The invention discloses a preparation method and application of a temperature-sensitive
polymer modified diaphragm for a low-temperature
lithium-
sulfur battery, and belongs to the field of secondary batteries. According to the specific scheme, the method comprises the following steps: step 1, dispersing ZIF-8
powder in a
mixed solution of a
niobium source and a
ferrocene derivative, stirring and dipping, removing a
solvent, and pyrolyzing the material in an
inert atmosphere to obtain Nb-Fc-N-C; step 2, mixing the Nb-Fc-N-C with a precursor containing a polar
sulfonic acid group, and performing
pyrolysis in an
inert atmosphere to obtain an Nb-Fc-SO3H-N-C catalyst; and 3, dissolving a temperature-sensitive
polymer monomer and an Nb-Fc-SO3H-N-C catalyst in a
solvent, adding a cross-linking agent and an initiator, uniformly stirring,
coating the diaphragm with the mixture, and initiating a
polymerization reaction to obtain the temperature-sensitive
polymer modified diaphragm. According to the invention, the anchoring-conversion capability on
polysulfide is obviously enhanced, the
diffusion barrier of
lithium ions is reduced, and the low-temperature performance and high-temperature safety of the
lithium-
sulfur battery are effectively improved.