2results about How to "High pseudocapacitance" patented technology

The invention discloses a preparation method of a nitrogen / oxygen / sulfur co-doped beta-cyclodextrin-based porous carbon material, which is characterized in that monochlorotriazine-beta-cyclodextrin is compounded with thiophene by utilizing the host-guest interaction of beta-cyclodextrin and thiophene and the pi-pi accumulation action between triazinyl and thiophene, and the nitrogen / oxygen / sulfur co-doped beta-cyclodextrin-based porous carbon material is obtained. Then crosslinking with polyethyleneimine to form a three-dimensional porous integral material, so that uniform compounding of a carbon source and heteroatoms is realized; and pre-carbonizing and carbonizing and activating by using an activating agent to obtain the nitrogen / oxygen / sulfur co-doped beta-cyclodextrin-based porous carbon material with a graded pore channel structure. The specific surface area of the material can reach 3547m < 2 >. G <-1 >, and the specific capacitance is 642F. G <-1 > under the current density of 0.5 A. G <-1 >. The energy density of a symmetric supercapacitor assembled by the material reaches 19.78 Wh.kg <-1 > under the power density of 299.95 W.kg <-1 >, the cycling stability is good, and the capacity retention ratio is 96% after 10000 times of cyclic charging and discharging.

The invention discloses a porous carbon material and a template-free preparation method thereof. The specific surface area of the porous carbon material is not less than 500 m < 2 > / g, and the total content of pyrrole nitrogen and pyridine nitrogen accounts for not less than 85% of the total nitrogen element; the method comprises the following steps: dissolving carboxylated chitosan and glucosamine hydrochloride in water to obtain a mixed solution; carrying out hydrothermal reaction on the mixed solution to form a hydrogel precursor with a gap structure; and drying the precursor, and carrying out carbonization treatment in an inert atmosphere to finally obtain the porous carbon material rich in pyrrole nitrogen and pyridine nitrogen. The method does not need to use any template agent and etching agent, and is simple in process, low in cost, green, environment-friendly and easy for large-scale production. The porous carbon material prepared by the invention has high specific surface area and high content of electrochemical active nitrogen species, and the lithium ion battery silicon-carbon negative electrode material prepared by taking the porous carbon material as a substrate shows excellent electrochemical performance.