The invention provides a preparation method of a
lithium-
sulfur battery positive
electrode. The preparation method comprises the following steps: uniformly mixing an active substance
sulfur, a conductive agent and a binder to obtain a mixture, then adding a dispersing
solvent into the mixture, and uniformly mixing to obtain
electrode slurry; uniformly
coating a positive
electrode current collectorwith the electrode
slurry to obtain a wet electrode coated with the
slurry; freezing the wet electrode coated with the slurry in a low-temperature environment of -80 to -5 DEG C for 1-5 hours until the wet electrode is frozen and formed, so that the dispersing
solvent in the wet electrode is solidified and crystallized to obtain a solidified electrode; placing the solidified electrode in a vacuumenvironment with the vacuum degree of 0.1-100Pa for 1-5 hours, so that
solid-phase sublimation of
ice crystals in the solidified electrode is carried out to obtain a
solid-phase sublimated electrode;and carrying out rolling treatment on the
solid-phase sublimated electrode, and controlling the
porosity of the electrode to be 50-70% to obtain the
lithium-
sulfur battery positive electrode. The preparation method is simple, and the problem of electrode
cracking in the preparation of a high-sulfur-carrying positive electrode by adopting a traditional hot
drying method is effectively solved.