5results about How to "Improve carbonization yield" patented technology

The invention belongs to the technical field of hard carbon materials, and particularly relates to a preparation method and application of a polyurethane-based hard carbon material. The preparation method comprises the following steps: carrying out roasting carbonization and post-treatment on a solid polyurethane material at 900-1400 DEG C to obtain a powdery polyurethane-based hard carbon material; the solid polyurethane material is a polyurethane product prepared from reaction raw materials including isocyanate, non-phosphorus-containing polyol and phosphorus-containing polyol through a reaction. According to the invention, the polyurethane material is prepared by adding the phosphorus-containing polyol, and the polyurethane material is applied to the field of batteries as a negative electrode raw material, so that high carbonization yield can be maintained, and excellent performances such as initial coulombic efficiency, energy density, cycle capacity retention rate and the like of the battery can be realized.

The application discloses a kind of nitrogen-doped porous carbon spheres based on arginine and its preparation method and application, belong to sodium ion battery negative electrode material technical field.Preparation method includes the following steps: arginine and benzene dimethylaldehyde are added to reaction solvent, after being mixed uniformly, nitrogen-doped porous carbon sphere precursor is obtained by transferring to reaction kettle and carrying out solvothermal reaction;Nitrogen-doped porous carbon sphere precursor is carbonized at 650-850 DEG C under protective gas atmosphere to obtain nitrogen-doped porous carbon sphere.The nitrogen-containing polymer sphere obtained by the reaction of benzene dimethylaldehyde and arginine is used as carbon precursor in the application, and nitrogen-doped porous carbon sphere is obtained by one-step carbonization, which can be used as sodium ion battery negative electrode material and has excellent electrochemical sodium storage performance.

This invention belongs to the field of battery manufacturing technology, specifically relating to a wood-based hard carbon anode material, its preparation method, and its application in sodium-ion batteries. Addressing the high cost of hard carbon material precursors, this invention proposes a method for preparing a wood-based hard carbon anode material, comprising: using natural wood particles as a carbon source precursor, first subjecting them to hydrothermal treatment in a strong acid solution containing hydrogen peroxide, followed by high-temperature carbonization to obtain the wood-based hard carbon anode material. This invention uses natural wood as a raw material, eliminating the need for pore-blocking agents, and thus forming a wood-based hard carbon anode material with a closed-cell structure, providing a better environment for sodium ion insertion and extraction.

The application relates to the technical field of sodium ion battery negative electrode materials, and discloses resin-based hard carbon microspheres for sodium ion batteries and a preparation method thereof, which comprises the following steps: mixing styrene, a crosslinking agent and a catalyst to prepare an oil phase, dispersing the oil phase in a polyvinyl alcohol aqueous solution, and preparing resin microspheres through micro-suspension polymerization; and then performing air atmosphere pre-oxidation and inert atmosphere carbonization treatment to obtain a target product. Through regulation and control of a micro-suspension polymerization formula and a step-by-step heat treatment process, a dense spherical structure with rich closed pores and a suitable interlayer spacing is constructed, and the technical problems of low tap density and easy melting collapse of pyrolysis of traditional resin-based hard carbon are effectively solved. The obtained hard carbon microspheres have uniform particle size distribution, extremely high tap density and excellent powder fluidity, simultaneously exhibit high reversible specific capacity, high initial efficiency and excellent rate cycle stability, and are suitable for large-scale commercial application.

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.