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 preparation method for a high-performance three-dimensional carbon nanotube composite negative electrode material. The preparation method comprises: by taking a carboxylated carbon nanotube as a three-dimensional network framework and taking a high-capacity material subjected to layer by layer self-assembly and modification as an active substance, uniformly mixing the carbon nanotube with the active substance under the action of electrostatic attraction; and then performing in-situ coating by taking a mixed element-containing N or S-doped carbon source as a three-dimensional coating layer, and performing high-temperature treatment to obtain the high-performance three-dimensional carbon nanotube composite negative electrode material. The invention furthermore discloses the high-performance three-dimensional carbon nanotube composite negative electrode material and an application thereof. According to the preparation method, the cycle performance of the active substance is remarkably improved, and the capacity of the composite material can be controllably adjusted by controlling a ratio of the carbon nanotube to the active substance. In addition, a solvent used in the method is water, so that the method is environmentally-friendly, good in repeatability and low in cost, and has relatively high potential of large-scale application and good industrialized prospects.

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 for a high-performance porous Co-Mn-O nanosheet material as well as the material obtained by the preparation method and an application of the Co-Mn-O nanosheet material. The porous Co-Mn-O nanosheet with a controllable thickness and size is prepared in one step by using a synthetic method induced by a surfactant, taking an amphiphilic block copolymer asthe surfactant and a pore forming agent, taking water, ethanol and ethylene glycol as solvent phases, and adopting a high-temperature and high-pressure solvent thermal reaction. The porous Co-Mn-O nanosheet can be used as a negative electrode material to be used in a lithium ion battery and has excellent performance. The porous two-dimensional Co-Mn-O nanosheet is designed according to the characteristics in charge-discharge cycles of the negative electrode material of the lithium battery, thus problems such as remarkable volume effects and poor conductivity in a negative electrode material of a lithium battery are fully solved, and the electrochemical performance of the electrode material is greatly modified; and the preparation raw materials are cheap, the operation process is simple, the yield is high, the charge-discharge performance and the speed of the material are excellent, and the porous Co-Mn-O nanosheet is convenient for industrialized production.

The invention discloses a high-performance composite material and its preparation method and application. The composite material is mainly made of water-soluble starch and active substances. The starch is carbonized at high temperature, and the nanoparticles of the active substances exist in the interior of the carbon structure. , forming a coating structure, and there are abundant microporous structures in the entire composite structure. Compared with the prior art, the present invention has simple process steps, short reaction time, good repeatability, high yield, low cost, and good potential for large-scale application; the preparation steps and the raw materials used are green and environmentally friendly; the prepared composite electrode The electrochemical performance of the electrode has been significantly improved, and it is used to prepare a lithium ion electrode, which has good cycle stability and excellent charge and discharge performance.

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 tungsten oxide nanowire wound composite material, a preparation method and application thereof in lithium ion batteries. A tungsten oxide nanowire is wound on the surface of a modified active substance surface to serve as an external expansion inhibition material, and then the outer surface is coated with a carbon layer to serve as a conducting layer to obtain the high performance tungsten oxide nanowire wound composite material. The tungsten oxide nanowire wound composite material prepared by the method provided by the invention can be used as a lithium ion battery cathode material. The process involved in the invention has the advantages of simple step, good repeatability, high yield, low cost, and good large-scale application potential. The composite material active material surface is coated and wound with a tungsten oxide nanowire and the nanowire is coated with a carbon layer, and the structure can effectively restrain the volume effect of nano materials and can significantly improve the electrochemical properties of the active substance. The tungsten oxide nanowire wound composite material can be applied to preparation of lithium ion electrodes, and has good cyclic stability and excellent charge and discharge performance.

The invention discloses a porous cobalt sulfide nanoflower and its preparation method and application. The invention uses a high-proportion water mixed solution as a confined solvent, cobalt nitrate hexahydrate as a metal cobalt source, and L-cysteine ​​as a sulfur source. Using P123 and PVP as surfactants, templates and pore-forming agents, react at a fixed temperature in a closed reactor with a reflux device, the prepared product is washed and dried, and then sintered at a high temperature under an inert atmosphere to synthesize Flower-like cobalt sulfide with a porous structure. The invention also discloses the material and its application. The preparation method of the present invention has the advantages of cheap and easy-to-obtain raw materials, simple equipment, low reaction temperature, good repeatability, etc., overcomes the environmental pollution problem caused by the use of organic solvents in the previous synthesis methods, and overcomes the high temperature preparation of cobalt sulfide in the previous synthesis methods Process complex issues such as high-pressure hydrothermal conditions. The obtained products have broad application prospects in the fields of catalysis, energy storage, and material science.

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 graphene-metal oxide composite negative electrode material and a preparation method therefor. The composite negative electrode material is mainly prepared from graphene and metal oxides. Graphene is employed as a three-dimensional network skeleton, metal oxides modified through layer-layer self assembly are employed as active substances, and a composite negative electrode material with oxygen deficiency is prepared. Compared with the prior art, the material can be prepared in conditions that the time is 3-10h and the temperature is 350-450 DEG C. The conductivity of the active substances is improved obviously, oxygen vacancy of the metal oxides can be increased greatly, and therefore the cycle performance of the composite material is improved greatly. In addition, the technology is simple, the repeatability is good, the cost is low, and the composite negative electrode material has a good large-scale application potential.

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.

The invention discloses a preparation method and application of a tungsten-based nanoflower material. Cu, W metal blocks and rare earth salts are fully ball milled and mixed, and rare earth doped 50nm-1μm Cu-W is prepared by a variable current laser ion beam gas phase method Alloy nanospheres, and then remove metal copper by controlling the temperature and time of liquid phase oxidation to obtain rare earth doped W‑W 2 o 3 The composite structure is finally calcined to prepare a rare earth-doped tungsten-based nanoflower material with controllable sheet density and rich oxygen vacancies. The application of the above-mentioned tungsten-based nanoflower material in the preparation of photocatalyst, gas sensor or negative electrode material of battery. The prepared rare earth-doped tungsten-based nanoflower material containing rich oxygen vacancies can be applied to high-performance lithium-ion battery anode materials, sensor materials or photocatalytic materials. Compared with the prior art, the present invention has simple process steps, short reaction time, good repeatability, high yield, low cost and good potential for large-scale application.