The invention relates to a method for preparing a
nitrogen-doped multi-dimensional
hierarchical porous carbon material with high specific surface area and high pore volume. The
nitrogen-doped multi-dimensional
hierarchical porous carbon material is used as a
sulfur positive
electrode carrier adaptive to an aluminum-
sulfur battery. The preparation method comprises the following specific steps: 1, preparing a
polymer precursor with
high nitrogen content through amine-
aldehyde condensation
polymerization; 2, carbonizing the precursor under the actions of high-temperature volatilization of
zinc salt and the like to prepare a
nitrogen-doped multi-dimensional
hierarchical porous carbon material; 3, optimizing the pore channel structure of the nitrogen-doped three-dimensional hierarchical pore carbon material through
potassium hydroxide etching; 4, loading elemental
sulfur into the nitrogen-doped multi-dimensional hierarchical
porous carbon through a sublimation method to form a composite positive
electrode; 5, preparing a positive
pole piece of the aluminum-sulfur battery; 6, performing battery
assembly and performance evaluation. The
discharge capacity of a battery assembled by the aluminum-sulfur battery positive
electrode material prepared by the method and
acetamide / aluminum
chloride electrolyte is kept at 1000 mAh g <-1> or above after 50 cycles at 0.2 A g <-1>, and the
discharge capacity is kept at 400 mAh g <-1> or above and the coulombic efficiency is kept at 96% or above after 700 cycles at 1A g <-1 >. The preparation method has the advantages of low
raw material cost, environment friendliness, good structure optimization effect, easiness in modification, good cycle performance of the assembled aluminum-sulfur battery and the like. The method is applied to the field of aluminum-sulfur batteries.