7 results about "Macroporous carbon" patented technology

The present application relates to the field of battery, especially to a gradient pore hierarchical nitrogen-doped carbon-coated composite sodium supplement agent and its preparation method and application, comprising: a composite sodium supplement agent core and a coating layer coated on the surface of the composite sodium supplement agent core; wherein the composite sodium supplement agent core comprises: an inorganic sodium supplement phase and an organic sodium supplement phase; the coating layer comprises from inside to outside: an inner dense amorphous carbon layer, a middle mesoporous carbon layer and an outer macroporous carbon layer. The present application innovatively designs a gradient pore carbon coating structure from inside to outside, the inner dense amorphous carbon layer realizes efficient isolation protection, the middle mesoporous carbon layer solves the problem of ion transmission obstruction, and the outer macroporous carbon layer improves the electronic conduction and volume buffering capacity, completely solving the inherent contradiction between the denseness of the traditional carbon coating layer and ion transmission, realizing the synergy and unity of "isolation protection-ion transmission-electronic conduction".

The invention discloses a nitrogen hybridization molded macroporous carbon material and a preparation method thereof. The nitrogen content ratio delta of the micron-sized pore surface to the pore wall of the nitrogen hybridization molded macroporous carbon material is 0.9-1.1; the area ratio of 0.5-30 [mu] m pore channels in unit area is greater than 75%, and the ratio of 7.5-15 [mu] m pore channels in the 0.5-30 [mu] m pore channels is greater than 55%. The preparation method comprises the following steps: (1) mixing and grinding flour and alkali, adding a proper amount of distilled water, mixing and kneading into a plastic body, and extruding and molding; (2) directly putting the strip-shaped material obtained in the step (1) into a high-pressure kettle for sealed heating treatment, and drying the treated material; and (3) carrying out nitrogen hybridization and activation treatment on the dried material in the step (2) to obtain the nitrogen hybridization molded macroporous carbon material. The bulk phase of the nitrogen-hybridized macroporous carbon material contains micron-sized pore channels, nitrogen-containing functional groups are uniformly distributed on the surfaces and pore walls of macropores, and the nitrogen-hybridized macroporous carbon material has good application prospects in the aspects of catalytic oxidation, catalytic hydrogenation, superhard materials, adsorption, fuel cells and the like.

The invention discloses a molded macroporous carbon material with high basic group content and a preparation method thereof. The basic group content of the molded macroporous carbon material with high basic group content is 0.75-1.15 mmol / g, the area proportion of 0.5-30 [mu] m channels in unit area is greater than 80%, and the proportion of 7.5-15 [mu] m channels in the 0.5-30 [mu] m channels is greater than 60%. The preparation method comprises the following steps: (1) uniformly mixing flour and an alkaline substance, grinding, adding a proper amount of distilled water into the mixed material, kneading into a plastic body, and extruding into strips; (2) directly putting the formed material in the step (1) into a closed container for heat treatment, and drying the treated material; and (3) putting the material obtained in the step (2) into a tubular furnace, and carrying out second-stage carbonization under the protection of an inert atmosphere to obtain the carbon material. The carbon material provided by the invention has the advantages of higher basic group content and micron-sized macroporous channel content, high mechanical strength, good wear resistance, simple preparation process and environmental friendliness, and can be widely used in the fields of adsorption materials, catalysts, catalyst carrier materials, electrode materials, hydrogen storage materials and the like.

This invention provides a method for preparing a three-dimensional textured macroporous carbon composite with adjustable carbon shell morphology, comprising the following steps: S1, dispersing a phenolic prepolymer in a solvent to prepare a phenolic prepolymer slurry; S2, adding graphene oxide to the prepared phenolic prepolymer slurry, mixing well, and preparing a carbon precursor spraying liquid; S3, spraying the prepared carbon precursor spraying liquid onto a planar fiber carrier to obtain a carbon precursor carrier composite; S4, heat-treating the carbon precursor carrier composite to obtain three-dimensional hollow porous carbon. This invention uses planar fiber materials as the reaction site, eliminating the need for other templates, and uses graphene oxide as the key component of the carbon precursor. Combining the advantages of continuous operation technology such as ultrasonic dispersion and atomized spraying, the carbon precursor is composited on the surface and interior of the carrier. After heat treatment, three-dimensional hollow porous carbon is prepared. The morphology of the carbon shell composited on the three-dimensional textured macroporous carbon framework can be controlled simply by adjusting the content of the key components in the carbon precursor.

The application discloses a lithium iron phosphate positive electrode material, a positive electrode sheet and a preparation method thereof. The material comprises a LiFePO4 core with (010) crystal face preferred orientation (orientation degree > 80%) and a gradient carbon coating layer, wherein the core is co-doped with Ti4+ and F- (Ti4+ occupies Li sites, F- substitutes O sites, and the doping amount x = 0.02-0.08), and the gradient carbon coating layer comprises, from inside to outside, microporous carbon, mesoporous carbon and macroporous carbon / graphene composite layers. The material is prepared by an optimized liquid-phase co-precipitation-subsection sintering process, comprising specific proportion carbon source compounding, precise control freezing drying and gradient sintering steps. The material has excellent ion / electron transmission performance, a 0.2C specific capacity of greater than or equal to 155 mAh / g, a 5C capacity retention rate of greater than 95%, excellent low-temperature performance at-40 DEG C, and a 2000-cycle capacity retention rate of greater than 90%. The application further provides a positive electrode sheet and a lithium ion battery comprising the material, and the material is particularly suitable for high-power power batteries and extreme environment applications.

The application belongs to the technical field of organic synthesis, and discloses a preparation method of 3-methyl-2-buten-1-ol and a catalyst thereof. The preparation method comprises the following steps: 2-methyl-3-buten-2-ol is subjected to isomerization under the catalysis of a composite catalyst to generate 3-methyl-2-buten-1-ol; the composite catalyst comprises an active ingredient, a modifier and a carrier; the modifier is an amino acid; the active ingredient comprises cobalt elements and auxiliary metals; the auxiliary metals are one or more of palladium, ruthenium, iridium, platinum, iron, copper, nickel and bismuth; and the carrier is one or more of macroporous silica, macroporous calcium phosphate, macroporous aluminum oxide, macroporous carbon, macroporous silicon carbide and macroporous LaFeO3. The isomerization process is simple, no hydrogen is needed for isomerization, the selectivity of the final product is high, and no over-hydrogen by-product is generated.