31results about How to "Good potential for large-scale application" patented technology

The invention relates to a method for multidimensional preparation of graphene-based MXene nanoflowers, and belongs to the field of negative electrode materials of supercapacitors. According to the method, the unique advantages of space-time regulated femtosecond laser are utilized, and a MXene target material is processed in a graphene oxide nano dispersion liquid, so that the MXene nanoflower growing on the reduced graphene oxide substrate is synthesized by a one-step method. The size and morphology of the nanoflower can be regulated and controlled, the nanoflower has an extremely high specific surface area, and when the nanoflower is used as an electrode material of a supercapacitor, the nanoflower shows extremely high specific capacitance and good cycling stability. The method is high in controllability, and large-scale uniform preparation can be achieved. According to the method, a novel composite structure material is synthesized by utilizing space-time regulated femtosecond laser, and a new thought is provided for the field of material synthesis.

The invention discloses a high-performance carbon paper-based electrode negative electrode composite material and a preparation method and application thereof. The composite material is mainly composed of a carbon paper substrate and an active material, and the hydroxylated carbon paper is used as the substrate. It not only adheres to the surface of the carbon paper, but also penetrates into the interior of the carbon paper and adheres to the surface of the carbon fiber inside, and the entire composite structure contains a porous structure. Compared with the prior art, the invention has the advantages of simple process steps, short reaction time, good repeatability, high yield, low cost, and good potential for large-scale application; the prepared electrode is integrated, and no further processing is required. Conventional electrode preparation involves numerous process steps, such as mixing, coating, and drying, and is easy to use; when it is used to prepare lithium ion electrodes, it has good rate, cycle stability, and excellent charge-discharge performance.

The invention discloses a nitrogen-doped porous composite negative electrode material and a preparation method therefor. The composite negative electrode material comprises an active substance as a core, a core-shell structure applied to the outer surface of the active substance, and a porous carbon structure applied to the outer surface of the core-shell structure, wherein the core-shell structure is a mesoporous carbon structure formed by nitrogen-doped carbon; and the porous carbon structure is a uniform porous carbon structure coated with nitrogen-doped three-dimensional porous carbon. Compared with the prior art, the composite negative electrode material can better control the volume effect of the active substance, is remarkably improved in conductive performance and electrode cycle performance, is high in repeatability and low in cost, and has relatively high potential of large-scale application.

The invention discloses a preparation method and application of a heteroelement-doped carbon nanotube-encapsulated metal sulfide composite negative electrode material. Disperse transition metal salts, fructose, cyanoamine, etc. in a solvent and mix them uniformly, then undergo rotary evaporation treatment, fully dry the obtained powder, and sinter at high temperature in an inert atmosphere, and heat-treated powder. Thioacetamide hydrothermal vulcanization treatment can obtain heteroelement-doped carbon nanotube-encapsulated metal sulfide materials. The composite electrode prepared by encapsulating metal sulfide materials with heteroelement-doped carbon nanotubes, according to the characteristics of the negative electrode materials of sodium ion batteries in the charge-discharge cycle, encapsulates and coats a uniform carbon layer on the outside of the active material, and the carbon nanotubes The one-dimensional structure is conducive to improving electron conduction, thereby effectively improving and enhancing the electrochemical performance of electrode materials. The preparation and operation process of the invention is simple, the yield is high, the charge and discharge performance of the material is excellent, and the industrial production is convenient.

The invention discloses a preparation method and application of a Sn-SnSb / carbon nano sheet composite material. First, configure ethanol-water solution, and add urea or cyanoamine, tin antimony oxide, and glycogen in sequence in the ethanol-water solution, and ultrasonic dispersion is required for each addition; secondly, the above-mentioned mixed solution is rotary evaporated to dryness, and then passed After vacuum drying, grind the precursor powder, and finally transfer the precursor powder into a tube furnace, and carry out high-temperature carbonization by temperature programming under an inert atmosphere, to obtain a highly dispersed Sn-SnSb / carbon nanosheet composite material; the The weight ratio of carbon in the Sn‑SnSb / carbon nanosheet composite is 15‑60%. By designing nano-Sn and its SnSb alloys to be uniformly dispersed on the surface of conductive carbon nanosheets to form a three-dimensional structure, the electrochemical performance of electrode materials is effectively improved. The raw materials are cheap, the preparation is simple, the yield is high, and it is convenient for industrial production.

The invention discloses a preparation method of a high-performance porous-hollow composite anode material. An SiO<2> layer is introduced into the surface of a high-capacity nano anode material as a sacrificial layer; a uniform carbon layer is introduced through in situ polymerization of phenolic resin; a high-molecular polymer and a soft template are subjected to cross-linking polymerization on the surface; and the high-performance porous-hollow composite anode material is prepared through high-temperature carbonization and template removal methods. The invention further discloses the high-performance porous-hollow composite anode material and an application thereof. According to the characteristics of a lithium battery anode material in charge and discharge cycles, the uniform carbon layer coats the outside of an intermediate layer of an active material, and a uniform mesoporous structure is designed in the middle of the outer carbon layer, so that the electrochemical properties of the electrode material are effectively improved. The high-performance porous-hollow composite anode material is cheap in preparing raw materials, simple in operation process and high in yield; the charge and discharge properties of the material are excellent; and industrial production is facilitated.

The invention discloses a high-performance porous carbon-tin oxide monodisperse composite ball negative electrode material and its preparation method and application. P123 and monodisperse SiO are added to the aqueous solution of pyrrole or aniline monomer 2 , SnCl 2 After magnetic stirring in an ice bath, an aqueous solution of ammonium persulfate was added to initiate a copolymerization reaction, and finally a spherical composite carbon-tin oxide structure composite material with monodisperse characteristics and an oxygen vacancy-rich structure was prepared in one step through high temperature treatment. According to the characteristics of the lithium battery negative electrode material in the charge-discharge cycle, the present invention designs and prepares a carbon layer and tin oxide blended porous composite spherical structure, which is basically uniform and monodisperse, which is beneficial to eliminate the polarization of the electrode material, and simultaneously tin oxide and carbon material The homogeneous recombination of the electrode material is beneficial to reduce or reduce the volume effect of the electrode material, and its abundant oxygen vacancies and uniform porous structure can effectively improve the electrochemical performance of the electrode material.

The invention discloses a hard carbon material and a preparation method thereof. A natural component is used as a raw material, and through raw material primary calcination, coarse pulverization, special Binchotan coating carbonization, fine pulverization and classification, the best carbonization effect is obtained. The hard carbon is rich in amorphous microporous structures. Compared with the prior art, the preparation method has simple processes, a high yield, a low cost and a good large-scale application potential. The raw materials used in preparation are environmentally friendly. The electrochemical properties of the prepared hard carbon are obviously improved. The hard carbon material can be used in the preparation of lithium ion batteries, has good cycling and fast chargeability and excellent charge and discharge performances and is especially suitable for power batteries for electric vehicles with high power density and high energy density.

The invention discloses a high-performance Si@SnO 2 @C composite material and its preparation method and application, first introduce functional groups on the surface of high-capacity nano-silicon through surface modification, and then deposit a uniform layer of SnO in situ 2 layer, and then introduce a homogeneous carbon layer precursor through in-situ polymerization of phenolic resin, and prepare a composite material with a high-performance multilayer core-shell structure through high-temperature calcination; the invention also discloses a high-performance Si@SnO 2 @C Composite materials and their applications. According to the characteristics that the volume effect is easy to occur in the charge-discharge cycle of the lithium battery Si negative electrode material, the present invention effectively improves the electrochemical performance of the electrode material by coating the double coating layer on the outside of the middle layer of the active material; at the same time, the layer SnO 2 The role of the layer is not limited to the inert coating medium, it can also be used as a lithium storage material at a wider potential of 0.01-3V, SnO 2 The volume effect also occurs in the layer, which can provide sufficient buffer space for silicon, which has a more significant volume effect. Such a design structure is beneficial to prolong the cycle performance of silicon-based materials and improve the reversible capacity.