15results about How to "High carbon yield" patented technology

The present invention provides a production process for preparing biomass-based hard carbon precursor materials by a hydrothermal method. The following steps are included: S1, using biomass raw materials and water for batching to obtain slurry; S2, adding an auxiliary agent to the slurry, performing a hydrothermal reaction, setting the hydrothermal reaction temperature to 80-350°C, and stirring at a constant temperature for 1-24 hours to obtain a slurry after the reaction, wherein the auxiliary agent is a mixture of methacrylate, acrylonitrile and pyromellitic anhydride in a mass ratio of 1:0-4.5:0.05-2.5; S3, the slurry is separated into a liquid phase and a solid phase, wherein the solid phase is a crude product, the liquid phase is a mother liquor, and the crude product enters the next process; S4, washing, drying and crushing the crude product to form a carbon hard precursor material. The biomass-based hard carbon precursor material produced by the invention has an adjustable particle size, a narrow particle size distribution range, good uniformity, and low ash content.

The invention relates to a preparation method of a hard carbon negative electrode material with fast charging performance, which comprises the following steps: (S1) mixing metal chlorate with a thermoplastic precursor, and heating and preserving heat in an oxygen-containing atmosphere to obtain a pretreated thermoplastic precursor; carrying out curing treatment on the thermosetting precursor and an acidic curing agent to obtain a pretreated thermosetting precursor; (S2) uniformly mixing the pretreated thermoplastic precursor and the pretreated thermosetting precursor, and pre-carbonizing in an inert atmosphere; performing high-temperature carbonization in an inert atmosphere or a hydrocarbon gas atmosphere to obtain a hard carbon material; the pre-treated thermosetting precursor accounts for 50-90% of the total mass of the pre-treated thermosetting precursor and the pre-treated thermoplastic precursor. According to the method disclosed by the invention, the hard carbon material with a large number of small-aperture closed pores is prepared by mixing thermosetting and thermoplastic precursors in different proportions, and the hard carbon material has high capacity and high rate performance and also shows excellent cycling stability in a fast-charging sodium ion battery.

This invention provides a road petroleum asphalt-based hard-soft carbon composite material, the raw materials of which include road petroleum asphalt, light component small molecule stabilizer, heavy component small molecule oxidant, activator, and solvent; and the ratio of road petroleum asphalt:solvent:light component small molecule stabilizer:heavy component small molecule oxidant:activator is 1:15-25:0.05-0.2:0.05-0.2:2-5, calculated in g / mL / g / g / g. Furthermore, this invention also provides a method for preparing the aforementioned hard-soft carbon composite material, which includes the following steps: crosslinking treatment of the light component, crosslinking treatment of the heavy component, activation, and carbonization. This invention solves the problem in the prior art where the high price or low carbon yield of hard carbon precursors, high cost of oxidants, or complex overall formulations lead to high costs for the prepared asphalt-based sodium-ion battery anode carbon materials. The hard-soft carbon composite material of this invention not only has a lower cost but also combines the advantages of both hard and soft carbon, exhibiting high sodium storage capacity, high reversible specific capacity, high initial charge-discharge efficiency, and good cycle performance.

The invention relates to the field of new energy sodium ion battery energy storage devices, in particular to a spherical hard carbon material, a preparation method thereof and application of the spherical hard carbon material as a battery negative electrode material. The preparation method comprises the following steps: dissolving asphalt to form a uniform and compact coating shell layer on starch, controlling the thickness of the coating shell layer by adjusting the concentration of an asphalt solution, and forming a cross-linked structure in the asphalt and further enhancing the mechanical strength of the asphalt shell layer by utilizing oxidation cross-linking; meanwhile, in the heat treatment process, the starch is stably oxidized inside, so that the spherical structure is kept. Besides, during oxidation cross-linking, active free radicals and active small molecules generated by the starch are diffused from inside to outside and captured by the asphalt, so that the overall yield is further improved while the asphalt cross-linking in the shell layer is realized, and a skin-core structure formed by non-uniform asphalt oxidation is avoided. The method provided by the invention promotes the high value-added utilization of asphalt, further promotes the economic and sustainable large-scale preparation of hard carbon, and promotes the development of the energy storage industry.

The invention relates to the technical field of electrochemistry, and discloses a negative electrode active material and preparation and application thereof, a sodium-ion battery negative electrode material, a sodium-ion battery negative electrode and application, and the method comprises the following steps: (1) mixing a petroleum-based material and a hard carbon precursor with a solvent to obtain mixed slurry; (2) drying the mixed slurry obtained in the step (1); (3) performing pretreatment and high-temperature carbonization on the product in the step (2) to obtain a negative active material; wherein the mass ratio of the petroleum-based material to the hard carbon precursor in the step (1) is (0.1-4): 1. The preparation method of the negative electrode active material adopts a mode of compounding a petroleum-based material and a hard carbon precursor, and is simple and easy for industrial amplification; meanwhile, the common advantages of the two materials are achieved, the overall carbon production rate is increased, and the reversible capacity and the first-week coulombic efficiency of the negative electrode of the sodium-ion battery can be jointly improved.

The present invention belongs to the field of new material technology, and relates to the preparation of carbon fiber, and specifically to a method for improving the carbon yield of viscose-based carbon fiber. The method comprises the following steps: (1) soaking the viscose yarn in water at 80 to 90°C, ultrasonically cleaning it after soaking, and then soaking it in triethanolamine and diammonium phosphate solution in turn for catalytic treatment; (2) drying the catalytically treated viscose yarn, and then pre-oxidizing and stretching it at 220 to 280°C to obtain pre-oxidized yarn; (3) carbonizing and stretching the pre-oxidized yarn in a nitrogen atmosphere, and then cooling it to room temperature to obtain viscose-based carbon fiber. The present invention inhibits the production of L-glucose tar substances during the pre-oxidation and carbonization process, reduces the amount of tar during fiber carbonization, thereby reducing the decomposition loss of carbon and improving the carbon yield of viscose-based carbon fiber.

The present invention belongs to the technical field of new energy secondary battery material processing, specifically a high carbon yield nitrogen-doped sodium ion battery hard carbon negative electrode material and a preparation method thereof. The method comprises the following steps: (1) physically mixing amino-containing biomass A, hydroxyl-containing biomass B and a cross-linking agent to obtain a uniformly mixed mixture; (2) transferring the mixture to a homogeneous reactor, performing a cross-linking reaction at a certain temperature, and obtaining a cross-linked mixture C with a stable structure; (3) performing low-temperature pretreatment and high-temperature carbonization on the cross-linked mixture C to obtain a high carbon yield nitrogen-doped sodium ion battery hard carbon negative electrode material. The hard carbon negative electrode material of the present invention has the advantages of high carbon yield, high specific capacity, good rate performance and stable cycle performance, a wide source of raw materials, low cost, and a simple preparation process. Since the carbon yield is significantly improved, the cost is significantly reduced, the production capacity is also significantly improved, the product has good technical and economic benefits, and it is easy to realize large-scale industrial production.

The present application relates to a kind of contaminated straw fast carbonization detoxification method, comprising the following steps: S1: collecting contaminated straw;S2: contaminated straw is chopped to less than 2cm;S3: chopped straw is dried to moisture content is less than 15%;S4: drying straw is carried out first fast pyrolysis and obtains carbonized straw, flue gas is handled after passing through front condensation recovery purification system by fan and is recycled in second heating device;S5: carbonized straw is carried out second fast pyrolysis and obtains detoxification carbonized straw, flue gas is handled after passing through rear condensation recovery purification system;S6: front condensation recovery purification system and rear condensation recovery purification system collect heavy metal in flue gas and reuse flue gas.The present application also relates to a kind of contaminated straw fast carbonization detoxification equipment.The present application realizes the efficient detoxification recovery of heavy metal in straw by two high-temperature fast pyrolysis, belongs to the technical field of agricultural and forestry waste resource utilization.

The utility model discloses dry distillation carbonization equipment which comprises a carbonization furnace, the carbonization furnace comprises a furnace body and a furnace pipe which is detachably arranged in the furnace body; the furnace body is hermetically connected with the furnace pipe; a sealing cover is arranged at the top of the furnace; a plurality of exhaust holes are formed in the bottom of the furnace pipe; a smoke exhaust pipeline is arranged at the upper part outside the furnace body; a furnace door is arranged on the lower portion outside the furnace body. According to the utility model, the exhaust holes are formed in the bottom of the furnace pipe, so that wood vinegar, wood tar and combustible gas generated during carbonization of charcoal raw materials are discharged through the exhaust holes in the bottom of the furnace pipe and are directly contacted with open fire in the furnace body to be fully combusted, and the problem of safety accidents caused by pipeline blockage of the carbonization furnace can be effectively solved; and the use efficiency of equipment and the charcoal production efficiency are improved, and meanwhile, the retention time of high-temperature gas in the furnace pipe can be prolonged, so that the heat utilization rate and the heating uniformity can be improved, the quality consistency of charcoal can be ensured, and the charcoal content and the charcoal yield are improved.

This invention belongs to the field of environmental engineering technology, and specifically discloses a method for treating phytoremediation-derived biomass containing heavy metals. This method utilizes bone meal to immobilize heavy metals in the biomass through a co-hydrothermal process, controlling the leaching of Cd within a safe threshold range and Zn far below the safe threshold. This ensures that the resulting hydrothermal carbon composite material does not pose an ecological risk due to excessive heavy metal release. Furthermore, the hydrothermal carbon composite material obtained by this method possesses characteristics such as uniformity, porosity, and a large specific surface area, exhibiting excellent heavy metal adsorption capacity, thus enabling its reuse as a soil remediation agent. This method eliminates the need for separating heavy metals from the phytoremediation-derived biomass, is simple in process, and avoids problems such as acid washing wastewater pollution and treatment.

This invention relates to the field of electrochemical technology, and discloses a negative electrode active material and its preparation and application, as well as a sodium-ion battery negative electrode material and sodium-ion battery negative electrode and its application. The method includes the following steps: (1) mixing a petroleum-based material and a hard carbon precursor with a solvent to obtain a mixed slurry; (2) drying the mixed slurry obtained in step (1); (3) pretreating and carbonizing the product of step (2) at high temperature to obtain the negative electrode active material; wherein, the mass ratio of the petroleum-based material and the hard carbon precursor in step (1) is 0.1-4:1. The preparation method of this negative electrode active material adopts a composite method of petroleum-based material and hard carbon precursor, which is simple to prepare and easy to scale up industrially; at the same time, it combines the advantages of both materials, improves the overall carbon production rate, and can achieve a combined improvement in the reversible capacity and first-cycle coulombic efficiency of sodium-ion battery negative electrode.

The present invention discloses a method for preparing a chlorine-containing carbon-based heterogeneous composite negative electrode material for a sodium ion battery. The present invention provides a method for preparing a low-cost plastic-based hard carbon-soft carbon heterogeneous composite negative electrode material for a sodium ion battery. Abandoned chlorine-containing plastics, asphalt and a strong base are mixed and added to N, N-dimethylformamide, and the mixture is fully ground to obtain a mixture. After the mixture is dried, it is carbonized at 600-1100°C in an inert atmosphere to obtain a carbon product, which is recovered and washed to neutrality, and dried to obtain a plastic-based hard carbon-soft carbon composite material. The present invention realizes the composite of two low-cost carbon sources by a simple method, and constructs a hard carbon-soft carbon heterostructure, which exhibits excellent performance when used for the negative electrode of a sodium ion battery. The raw materials used in this method are widely available, low in price, simple in process, and conducive to large-scale production.

The invention relates to a preparation method and application of a modified epoxy resin-based hard carbon negative electrode material, in particular to a hard carbon negative electrode material obtained by deriving diammonium hydrogen phosphate serving as a curing cross-linking agent and a nitrogen and phosphorus atom doping agent of epoxy resin. The preparation method mainly comprises the following steps: dispersing epoxy resin and diammonium hydrogen phosphate in deionized water, uniformly mixing, then placing the mixture in an air dry oven for curing and crosslinking, then placing the cured epoxy resin in a tubular furnace in an inert atmosphere, and sequentially carrying out low-temperature pre-carbonization and high-temperature carbonization, and finally, carrying out ball milling treatment on the obtained product to obtain the modified epoxy resin-based hard carbon negative electrode material. The process for preparing the epoxy resin-based hard carbon negative electrode material is environment-friendly, the process is simple, the carbonization yield is obviously improved, and the electrochemical test shows that the hard carbon material prepared by the method has relatively high first coulombic efficiency and reversible capacity. The method plays a positive role in promoting wide application of the sodium ion battery in the new energy industry.

The invention discloses an amorphous carbon material, a preparation method and application thereof, and a sodium ion battery, the preparation method comprises the following steps: 1) mixing sucrose with ammonium dihydrogen phosphate, and heating to obtain pretreated sucrose; (2) mixing the pretreated cane sugar with resin for coating; and (3) carrying out high-temperature carbonization treatment on the coated cane sugar, so as to obtain the amorphous carbon material. The material with a special pore structure is prepared, and when the material is used as a sodium-ion battery negative electrode material, on the basis of improving the sodium storage capacity, the carbon yield is improved, and the cost can be further reduced.

This invention discloses a method for producing porous biomass carbon using Casuarina equisetifolia. The method involves reactively extruding Casuarina equisetifolia powder, ammonium polyphosphate, melamine, potassium acetate, urea, and water using a twin-screw extruder to obtain a rheological phase plasticizing precursor. This precursor is then refined through segmented curing and foaming, high-temperature reforming activation, hot water digestion, and ultrasonic acid washing to obtain porous biomass carbon. This invention utilizes a eutectic system to achieve low-temperature continuous processing of the precursor and inhibits equipment corrosion. A well-developed pore structure is constructed through a stepwise cross-linking foaming and mild activation strategy. The porous biomass carbon prepared by this invention has an ash content ≤1.12%, a carbon yield ≥35.7%, an iodine adsorption value ≥1278 mg / g, and a methylene blue adsorption value ≥175 mg / g. Furthermore, the process is continuous, with minimal equipment corrosion, making it suitable for industrial production.