Preparation method of biomass algae-based lithium-sulfur battery positive electrode material

Abstract

The invention relates to a preparation method of a biomass algae-based lithium-sulfur battery positive electrode material. The method comprises the following steps of 1, cleaning algae, smashing and drying the algae, sieving the algae with 60-mesh sieve to obtain algae powder, and placing the algae powder in a high-temperature tubular furnace with an argon atmosphere to obtain carbide algae powder; 2, adding the carbide algae powder into a hydrochloric acid solution for immersion, and obtaining porous layered powder after drying; and 4, mixing the porous layered powder and sulfur powder, adding the mixture into a sand mill for nanometer ball-milling to obtain a sulfur carbon mixture, and obtaining the sulfur carbon composite material after vacuum hot melting under 140-160 DEG C. The biomass algae-based lithium-sulfur battery positive electrode material has favorable electrical property, is safe and has no pollution, the needed raw material is low in cost, and moreover, the composite material is short in preparation time, high in repeated operation and is suitable for industrial production.

Description

technical field [0001] The invention belongs to the technical field of electrochemistry, and in particular relates to a preparation method of a lithium-sulfur battery cathode material based on biomass seaweed, a preparation method of a lithium-sulfur battery cathode sheet, and a lithium-sulfur battery. Background technique [0002] The theoretical specific capacity of lithium-sulfur batteries is 1675mAh / g, and the theoretical energy density is as high as 2600wh / kg, which is eight times the theoretical energy density of traditional lithium-ion batteries. Moreover, elemental sulfur, the positive active material, is cheap, non-toxic and harmless. Based on the above advantages, lithium-sulfur batteries have attracted the attention of many researchers. They are expected to replace conventional lithium-ion batteries at this stage and become high-energy-density, long-life secondary batteries in the future. [0003] At present, there are many technical defects in lithium-sulfur batt...

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Problems solved by technology

[0006] The purpose of the present invention is to address the deficiencies in the current technology, and provide a preparation method for the lithium-sulfur battery cathode material based on biomass seaweed. The sulfur-carbon composite material is used to manufacture the positive electrode of the lithium-sulfur battery. Set the dry seaweed powder, then add the seaweed powder to the tube furnace and deoxygenate, then heat the seaweed powder for a set heating time and then cool it, so as to carbonize the seaweed powder; add the carbonized seaweed powder to the hydrochloric acid solution to remove impurities , washed with water, vacuum filtered and dried to obtain the porous layered body powder, and then mixed with the porous layered body powder and sulfur element, so that the sulfur element can penetrate into the pores of the porous layered body powder, so as to obtain the sulfur-carbon composite material , effectively solve the technical problems of the existing sulfur-carbon composite material preparation technology that the preparation process is complicated, the carbon needs to be artificially pore-formed by special reagents, and the porosity of the engraved carbon is not high, resulting in low sulfur loading capacity

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