47results about How to "Improve Capacitive Performance" patented technology

The invention discloses a silicon carbon material, a preparation method thereof and a lithium ion battery. The preparation method of the silicon-carbon material comprises the following steps: S1, adding an alkaline reagent into a mixed solution containing a porous carbon-loaded silicon substrate, transition metal salt and a solvent, and drying to obtain a first precursor; s2, performing carbon deposition on the first precursor by adopting a chemical vapor deposition method, performing in-situ growth of a carbon nanotube, and then performing acid pickling and drying to obtain a second precursor; s3, performing silicon deposition on the second precursor by adopting a chemical vapor deposition method, and forming silicon nanoparticles and / or silicon nanowires in the carbon nanotubes in situ to obtain a third precursor; and S4, carrying out carbon coating on the third precursor to obtain the silicon carbon material. The silicon-carbon material is excellent in expansion inhibition performance and compressive strength and has excellent conductivity, and the lithium ion battery containing the silicon-carbon material can give consideration to excellent capacity performance, rate performance and cycle performance.

The invention discloses a composite silicon carbon material, a preparation method and application thereof and a lithium ion battery, and the preparation method comprises the following steps: S1, carrying out heat treatment, carbonization treatment and activation treatment on a carbon sphere precursor to obtain a porous carbon sphere; the carbon sphere precursor comprises a carbon source and a polymer nanosphere containing transition metal; the transition metal-containing polymer nanosphere comprises a polymer nanosphere matrix and a transition metal coating layer, s2, performing silicon deposition on the porous carbon spheres by adopting first chemical vapor deposition to obtain a silicon carbon material precursor; s3, performing carbon deposition on the silicon carbon material precursor by adopting second chemical vapor deposition; and removing the transition metal to obtain the composite silicon-carbon material. The obtained composite silicon-carbon material is high in silicon loading capacity and excellent in stability and conductivity, the lithium ion battery adopting the composite silicon-carbon material is excellent in capacity performance, and excellent cycle performance and initial efficiency can be taken into account.

The invention relates to a negative active material and a preparation method thereof, a negative pole piece, a battery and an electric device. The negative electrode active material comprises: an inner core, which comprises porous graphite and a sulfur-doped hard carbon-metal oxide material, and the sulfur-doped hard carbon-metal oxide material is arranged in a pore channel of the porous graphite; the shell layer coats at least part of the surface of the inner core, and the shell layer comprises a polyaniline material. According to the negative electrode active material provided by the invention, through the synergistic effect among the porous structure of the graphite, the sulfur-doped hard carbon-metal oxide material and the shell layer containing the polyaniline material, the capacity performance, the rate performance and the cycle performance of the battery are improved at the same time, and the comprehensive improvement of the material performance is realized.

The invention discloses a composite silicon-carbon material, a preparation method and application thereof and a lithium ion battery. The composite silicon carbon material comprises a sandwich structure, and the sandwich structure comprises a graphene nanobelt coated with a silicon layer and a graphene layer in sequence. The composite silicon-carbon material has good conductivity and good mechanical properties, and the lithium ion battery containing the composite silicon-carbon material can give consideration to excellent initial coulombic efficiency, cycle performance and rate capability, and has good capacity performance.

The invention discloses a hard carbon material, a preparation method thereof, a pole piece, application and an electrochemical device. The preparation method of the hard carbon material comprises the following steps: sequentially carrying out heat treatment, carbonization treatment and carbon coating on a mixture of a carbon precursor and an activating agent to obtain the hard carbon material, the carbonization treatment temperature is higher than the heat treatment temperature; the heat treatment temperature is 700-900 DEG C; the hard carbon material prepared by the invention has a relatively large closed pore volume, and a battery assembled by the hard carbon material has relatively good electrochemical performance, and particularly has relatively good initial coulombic efficiency.

The invention provides a positive pole piece, a battery, an energy storage device and electric equipment, the positive pole piece comprises a positive current collector, the surface, deviating from a winding center, of the positive current collector is provided with a first positive material layer, and the surface, facing the winding center, of the positive current collector is provided with a second positive material layer; the average non-sphericity degree of particles of the positive electrode material with the particle size larger than or equal to 1 micron is k1, Dv50 is D1, k1 is larger than or equal to 10% and smaller than or equal to 19%, and D1 is larger than or equal to 0.8 micron and smaller than or equal to 1.2 microns; in the second positive electrode material layer, the average non-sphericity degree of positive electrode material particles with the particle size larger than or equal to 1 [mu] m is k2, Dv50 is D2, k2 is larger than or equal to 21% and smaller than or equal to 35%, and D2 is larger than or equal to 1.2 [mu] m and smaller than or equal to 1.7 [mu] m.

The utility model provides a battery, a battery module and electric equipment, and relates to the technical field of batteries, the battery comprises a first shell, a second shell, a cover body, a partition plate and a battery, the second shell is arranged in the first shell, and one part of the second shell is connected with the inner wall surface of the first shell; the partition plate is arranged in the first shell and divides the second cavity into a first liquid cooling channel and a second liquid cooling channel, the first liquid cooling channel is provided with a first liquid conveying opening, the second liquid cooling channel is provided with a second liquid conveying opening, a second end, away from the first end, of the partition plate is provided with a communication opening, and the battery is arranged in the first cavity. According to the battery, the battery module and the electric equipment provided by the utility model, liquid cooling can be carried out on the battery, and cooling liquid flows through a liquid cooling flow channel formed by the first liquid cooling channel and the second liquid cooling channel and can cover the whole surface of the battery, so that the liquid cooling effect on the battery is further improved; and the balance of the maximum capacity performance and better liquid cooling of the battery is realized.

The invention belongs to the technical field of sodium ion batteries, and relates to a positive electrode sodium supplementing agent NaxFeyNizO4 (at) C, a preparation method thereof and an application of the positive electrode sodium supplementing agent NaxFeyNizO4 (at) C in a sodium ion battery. The preparation method of the positive electrode sodium supplementing agent comprises the following steps: S1, mixing a sodium source, an iron source, a nickel source and an organic solvent, and calcining to obtain a compound NFNC; and S2, the compound NFNC obtained in the step S1 and a carbon source are mixed and calcined to obtain the positive sodium supplement NaxFeyNizO4 (at) C, and x: y: z = (2-4): (0.5-2): 1. The preparation method is characterized in that a sodium source, an iron source, a nickel source and an organic solvent are mixed and then subjected to first calcination treatment to obtain a compound NFNC, and then the compound NFNC and a carbon source are mixed and then subjected to second calcination treatment, so that the obtained positive electrode sodium supplementing agent NaxFeyNizO4 (at) C can reduce gas production of a sodium ion battery after a formation stage; and the sodium ion battery has excellent discharge capacity and cycle performance in a working voltage range.

The invention discloses a surface micro-nano structured graphene supercapacitor based on femtosecond laser processing and a preparation method thereof, a surface micro-nano structured graphene interdigital electrode is processed by femtosecond laser, and the surface of the surface micro-nano structured graphene interdigital electrode is provided with a periodic grating micro-nano structure parallel to the interdigital long axis direction; the supercapacitor with the periodic micro-nano grating structure parallel to the interdigital electrode direction is beneficial to increasing the specific surface area, provides more active sites, and can regulate and control the electric field to improve the migration rate of electrolyte ions. According to the supercapacitor with the periodic micro-nano grating structure parallel to the direction of the interdigital electrode, compared with a supercapacitor with the micro-nano grating structure perpendicular to the direction of the interdigital electrode and a supercapacitor without a micro-nano structure, the electrochemical performance of the supercapacitor is improved. A large-area supercapacitor array can be prepared based on the method, and the method has wide application potential in the fields of portable electronic equipment, intelligent wearable equipment, energy storage systems and the like.

This invention provides a method for screening the stability of biomass shell-derived hard carbon raw materials. The method investigates the optimal ratio and relationship between the lignin content and sugar content measured after alkali treatment in biomass shell materials, thereby screening the stability of biomass shell materials from different sources and batches. When the lignin content of the biomass shell material itself and the sugar content measured after alkali treatment satisfy the relationship 15≤β×L≤60, an effective balance between the lignin and sugar content in the biomass shell material can be achieved, resulting in a good porous structure. This method provides a simple and rapid screening process to obtain biomass shell materials with better stability. When biomass shell materials with better stability are subsequently used to prepare hard carbon battery materials, the resulting hard carbon battery materials exhibit good overall performance in terms of cycle life, capacity, and coulombic efficiency.

This invention discloses a method for reusing negative electrode graphite from waste lithium batteries, comprising the following steps: stripping graphite from the current collector to obtain waste graphite; mixing and grinding the waste graphite, sublimed sulfur, and red phosphorus to obtain a mixed powder; placing the mixed powder in an inert gas atmosphere and rapidly burning it in a rapid-burning device for a period of time, followed by cooling, to obtain recycled graphite. The invention also discloses the preparation and application of this recycled graphite. This invention is applicable to the field of lithium battery recycling technology. Rapid burning effectively removes impurity elements from the negative electrode graphite in waste lithium batteries, helping to reduce the negative impact of these impurities on the performance of the negative electrode graphite; subsequently, through the grinding reaction with sublimed sulfur and red phosphorus, C-S-P bonds are formed, improving the conductivity and rate performance of the graphite, thereby enhancing the capacity and cycle performance of the obtained recycled graphite.

The invention relates to the technical field of MOF energy storage, in particular to a preparation method of a photoresponse Cu-coated Fe heterogeneous MOF energy storage material, the photoresponse Cu-coated Fe heterogeneous MOF energy storage material and application of the photoresponse Cu-coated Fe heterogeneous MOF energy storage material.The preparation method comprises the following steps that (1) an inner core copper-based MOF is prepared, (2) a core-shell structure Cu-coated Fe-MOF is prepared, (3) surface plasma treatment is conducted, and the photoresponse Cu-coated Fe heterogeneous MOF energy storage material is obtained; and an efficient electron transmission channel is constructed by utilizing the interaction of abundant d-track electrons and a strong pi-d track. And secondly, MIL-101 (Fe) is selected as a shell, and 2, 2 '-bipyridine-5, 5'-dicarboxylic acid is introduced as a photosensitive ligand, so that the photoresponse performance is remarkably enhanced.

The invention discloses an electromagnetic band gap structure and a circuit board, and is applied to the field of high-frequency circuits. The signal connecting line is connected with the central part and extends along the direction far away from the central part; the metal wires are located on the periphery of the central part, the metal wires and the signal connecting wires are distributed at intervals, the two ends of each metal wire are connected with the central part, and a shielding groove is formed between each metal wire and the central part. According to the electromagnetic band gap structure provided by the invention, the cut-off frequency depth increase of noise is inhibited, the grounding bounce effect of the power supply layer can be effectively inhibited, and the effect of the grounding bounce effect on signal quality and electromagnetic radiation is further reduced; the shielding groove can prevent a signal interference source from diffusing, so that the integrity of signal transmission is ensured.

The invention belongs to the field of sodium-ion batteries, and particularly relates to a sodium-ion battery positive electrode material and a preparation method and application thereof. The preparation method comprises the following steps: S1, carrying out first mixing on a nickel source, a manganese source, a tellurium source and water to obtain a mixed solution, adding a precipitator and a chelating agent, and carrying out reaction, aging and first drying to obtain a precursor; and S2, carrying out second mixing on the precursor, a sodium source and a calcium source, carrying out second drying, compacting, and sintering to obtain the sodium ion battery positive electrode material, the tellurium element is introduced to regulate and control the particle morphology of a precursor microstructure and realize an in-layer Te-Ni-Ni-Te ordered upper layer structure, the ligand level structure is adjusted, and lattice oxygen loss is inhibited; the calcium element is added to maintain the cation content in the sodium layer and relieve O2-O2-rejection in the sodium extraction process, so that the prepared sodium ion battery positive electrode material can maintain a pure P2 type structure and has excellent capacity performance and cycle performance.

The invention belongs to the technical field of new energy materials, and particularly relates to slurry of a high-nickel positive electrode active material as well as a preparation method and application of the slurry. Wherein the slurry comprises a solid component and a solvent, and based on the total mass of the solid component, the slurry comprises the following components in percentage by mass: 94%-98.5% of a high-nickel positive electrode active material; 0.005% to 0.5% of an antioxidant; 0.01% to 0.5% of halogenated silane; 1%-2% of polyvinylidene fluoride; 0.5%-3% of a conductive agent; the slurry of the high-nickel positive electrode active material can inhibit gelation of the slurry, and meanwhile, a battery containing the slurry has relatively high capacity performance and has excellent performance when being applied to electric equipment.

The present application relates to lithium ion battery cathode material preparation technical field, and is a kind of preparation method of nitrogen-phosphorus-potassium co-doped carbon-coated lithium-rich lithium iron phosphate cathode material, comprising the following steps: cocoa powder is added dropwise with acetic acid solution, after reaction, dropwise add hydrogen peroxide, add lithium hydroxide, and the pH of mixed solution is controlled by the amount of deionized water added;After adding deionized water and carbon-coated lithium iron phosphate precursor, stir evenly, vacuum freeze-drying is carried out, and the product is obtained after sintering treatment of dry product in inert atmosphere.Cocoa powder resource is renewable, environment-friendly, and can provide rich nitrogen, phosphorus and potassium elements to complete the doping modification of carbon-coated lithium iron phosphate.The present application provides an environmentally friendly, clean and simple cathode material modification and synthesis idea, and the prepared cathode material has good rate performance and capacity performance.

The invention relates to the technical field of secondary batteries, in particular to a sodium ion battery positive electrode active material and a preparation method thereof, a positive electrode plate and a secondary battery, the sodium ion battery positive electrode active material comprises a polyanion material, the chemical formula of the polyanion material is Na < 3-x > A < x > V < 2-y > B < y > (PO4) 2F3, 0lt, x is less than or equal to 0.3, 0lt; y is less than or equal to 0.2, the doping element A is one or more of Li and K, and the doping element B is one or more of Y, Cr, Fe and Mg. The sodium-ion battery positive electrode active material obtained by co-doping the vanadium sodium fluorophosphate with the doping elements A and B has obviously improved capacity performance, cycling stability and rate capability.

The present invention relates to the technical field of polymer materials, and specifically discloses a water treatment material for electrically enhanced adsorption filtration and a preparation method and application thereof. The present invention comprises the following steps: (1) ultrasonically cleaning the melamine sponge, drying it, placing it in a tube furnace, introducing a protective gas, and setting the heating rate to 4 to 6°C / min ‑1 , after preheating, continue to heat up to 900-1100°C, keep warm, cool to room temperature, and obtain ultra-light flexible carbon sponge; (2) dissolve tris(hydroxymethyl)aminomethane in a solvent to obtain a solution, adjust the pH to 8.4-8.6, then add dopamine and polyethyleneimine, mix, add ultra-light flexible carbon sponge, stir and react for 10-14h, and obtain a water treatment material for electrically enhanced adsorption and filtration. The present invention uses N-rich melamine sponge as a precursor, which has a larger specific surface area; the sponge has good conductivity after high-temperature carbonization of inert gas; dopamine and polyethyleneimine are modified to improve their adsorption potential.

The invention belongs to the technical field of quinoline insoluble extraction and utilization and carbon material preparation, and particularly relates to a quinoline insoluble extraction method, spherical capacitance carbon and a preparation method thereof. The extraction method of the quinoline insolubles comprises the following steps: mixing coal liquefaction residues, quinoline, an extraction agent and a dispersing agent to form a mixed solution containing the quinoline insolubles; and adding an auxiliary agent into the mixed solution, mixing, standing and filtering to obtain the quinoline insoluble substance and an asphalt solution. The extraction method of the quinoline insoluble substances has the beneficial effects that the quinoline insoluble substances are extracted from the coal liquefaction residues through mixed solvent extraction-sedimentation, the high-purity asphalt product is obtained, the purity of the asphalt product and the quinoline insoluble substances can be remarkably improved, the ash content in related products is effectively reduced, and the production cost is reduced. The preparation requirement of the carbon material is met; the spherical capacitor carbon has the advantages of high specific surface area, high mechanical strength, low porosity, high volume energy density and high capacitance performance.

The invention relates to the technical field of batteries, and discloses a lithium-position nickel-doped positive electrode material and a preparation method and application thereof, and the preparation method comprises the following steps: (1) carrying out first mixing on a first lithium source, a first nickel source and a solvent to obtain a mixed metal solution; (2) carrying out spray drying on the mixed metal solution, and calcining to obtain lithium-nickel composite oxide microspheres; and (3) carrying out second mixing on the lithium-nickel composite oxide microspheres, a positive electrode precursor material and a second lithium source, and then sequentially pre-sintering and sintering to obtain the lithium-position nickel-doped positive electrode material. The lithium-position nickel-doped positive electrode material with excellent performance is prepared through mutual cooperation of designed specific preparation processes, so that the obtained positive electrode material can simultaneously exert excellent capacity performance and crystal structure stability in the running process of the lithium ion battery.

The invention discloses a graphite material and a preparation method thereof, an electrochemical device and electronic equipment. The graphite material meets the following conditions: La is less than or equal to 72 nm, and Lc is less than or equal to 15 nm; wherein La is a lattice constant of a graphite crystal in the graphite material on a 110 plane, and Lc is a lattice constant of the graphite crystal in the graphite material on a 002 plane; f is greater than or equal to 15 mN, and F is particle crushing force. An electrochemical device (especially a lithium ion battery) containing the composite material can ensure excellent first effect and fast charge performance, and also has excellent self-discharge performance, capacity performance and cycle performance.

This invention belongs to the field of structured light field generation and optical communication coding technology, and discloses a method and system for optical information expansion based on custom mask coding. The method involves: generating a coherent superimposed beam of conjugate modes based on the target light field; spatially filtering the coherent superimposed beam of conjugate modes to obtain a conjugate LG Gaussian beam with missing states; obtaining a high-dimensional information carrier phase distribution map based on the amplitude and phase information of the conjugate LG Gaussian beam with missing states; and expanding the target light field based on the high-dimensional information carrier phase distribution map. This invention solves the bottleneck of traditional algorithms easily getting trapped in local optima, significantly improves the quality of light field generation under complex diffraction screen conditions, and achieves high-efficiency, high-uniformity multi-vortex beam superposition control.

The present invention discloses an alkaline secondary battery zinc negative electrode material and a preparation method and application thereof, belonging to the technical field of alkaline secondary batteries. The technical scheme of the present invention is as follows: the alkaline secondary battery zinc negative electrode material is mainly composed of a ZnO / ZnS / C composite material or a metal-doped ZnO / ZnS / C composite material. The present invention also specifically discloses a preparation method of the zinc negative electrode material for an alkaline secondary battery and an alkaline secondary battery using the negative electrode material. The novel alkaline secondary battery negative electrode material of the present invention can reduce the deformation of the zinc electrode, inhibit the growth, hydrogen evolution, and passivation of zinc dendrites, improve the stability of the zinc negative electrode in alkaline solution, and greatly improve the cycle life of the alkaline secondary battery.

The present invention discloses the preparation and application of a water-based graphene oxide / polyaniline composite hybrid, and belongs to the field of functional material application. The present invention adopts a suitable solvent to disperse polyaniline powder as an oil phase, and then adds it into a water-dispersed phase graphene oxide aqueous dispersion for stirring and emulsification, and completes the nano-assembly between graphene oxide and polyaniline through solvent evaporation or water washing and centrifugation to obtain a water-dispersible and stable water-based graphene oxide / polyaniline composite hybrid; and then composites it with a water-based epoxy resin to obtain a water-based epoxy resin anti-corrosion coating. The water-based graphene oxide / polyaniline composite hybrid prepared by the present invention can be prepared into a flexible electrode film, which has a high specific capacitance and a long cycle life in the application process of supercapacitors, and the prepared water-based graphene oxide / polyaniline modified epoxy resin anti-corrosion coating has excellent water dispersion stability and corrosion resistance.

The invention belongs to the technical field of energy storage, and particularly relates to active slurry, a positive pole piece as well as a preparation method and application thereof. The invention relates to an active slurry, which comprises an active material and an organic solvent, and the solid content of the active slurry is 45wt%-60wt%; the active material comprises the following raw materials in percentage by mass: 93.5 wt%-97.5 wt% of an active substance; 1.5 wt% to 4.0 wt% of a binder; and 1.0 wt%-2.5 wt% of a conductive substance.

The invention provides a composite positive electrode material, a solid-state electrode plate, a solid-state battery and an energy storage device, the composite positive electrode material comprises an inner core and a polymer conductive fiber layer, and the polymer conductive fiber layer coats at least one part of the surface of the inner core; the inner core comprises a positive electrode active material, a solid electrolyte and one-dimensional conductive fibers, and the one-dimensional conductive fibers are distributed between the positive electrode active material and the solid electrolyte; the polymer conductive fiber layer comprises polymer conductive fibers, and at least part of the polymer conductive fibers and the one-dimensional conductive fibers are mutually wound to form a conductive network.

The present invention provides a graphite negative electrode material and a preparation method thereof and a battery, belonging to the technical field of negative electrode materials for new energy batteries. The preparation method of the graphite negative electrode material comprises: 1. adding expanded graphite to a zinc chloride solution, then adding sodium dodecylbenzene sulfonate, heating and stirring, filtering the reacted mixed solution after the stirring is completed, separating the zinc-containing graphite material, washing and drying for standby use; 2. adding the zinc-containing graphite material to a phytic acid solution, heating and stirring, filtering the reacted solution after the stirring is completed, separating the graphite solid, washing and drying for standby use; 3. adding the graphite solid to an ethyl orthosilicate solution, heating and stirring, filtering the reacted solution after the stirring is completed, separating the solid product, washing and drying to obtain a graphite negative electrode material. The graphite negative electrode material prepared by the above method constructs a cross-linked network between the graphite layers inside and outside the expanded graphite by zinc chloride, phytic acid and ethyl orthosilicate, thereby improving the stability of the expanded graphite.

The invention discloses a silicon-tin-carbon composite particle, a carbon-based silicon-tin-carbon composite material, a preparation method of the carbon-based silicon-tin-carbon composite material, a pole piece and an electrochemical device. The carbon-based silicon-tin-carbon composite material comprises a plurality of silicon-tin-carbon composite particles dispersed in a carbon substrate, the silicon-tin-carbon composite particles comprise shell layers, tin-containing particles and nano silicon particles, wherein the tin-containing particles and the nano silicon particles are packaged in the shell layers. The shell layer includes a tin-containing carbon layer. The carbon-based silicon-tin-carbon composite material disclosed by the invention has relatively good conductivity and relatively low charge transfer internal resistance. The battery assembled by the carbon-based silicon tin carbon composite material has better capacity performance, cycle performance and coulombic efficiency. The silicon-tin-carbon composite particle and the carbon-based silicon-tin-carbon composite material are simple in preparation method, relatively high in practicability and easy for industrial production.

The invention discloses a hybrid covert communication method for the Internet of Things and a related device, and relates to the technical field of covert communication, and the method comprises the steps: judging whether the digit of secret information to be transmitted in a concealed manner is greater than a preset digit, and if not, transmitting the secret information to be transmitted in a concealed manner based on the corresponding relation between a length interval where a preset CoAP data packet length is located and the secret information; sorting the plurality of CoAP data packets to enable the plurality of sorted CoAP data packets to form secret information to be transmitted in a hidden manner, if so, sorting the plurality of CoAP data packets based on a corresponding relationship between a length interval where a preset CoAP data packet length is located and the secret information, and embedding the secret information of a first digit in the plurality of sorted CoAP data packets, according to the method and the device, the covert communication can be carried out based on the CoAP network protocol, and the robustness, the detection resistance and the high capacity performance of the covert communication can be ensured.

The application discloses a semiconductor process equipment, including a semiconductor chamber, an electromagnetic coil, a support component and an insulating capacitance adjusting piece, wherein: the semiconductor chamber has an inner cavity, the support component is arranged in the inner cavity, and the support component is used for supporting a wafer; the semiconductor chamber comprises a dielectric window, and the dielectric window is arranged opposite to the support component; the electromagnetic coil is arranged outside the semiconductor chamber and opposite to the dielectric window, and a containing space is formed between the electromagnetic coil and the dielectric window; and the insulating capacitance adjusting piece is movably arranged in the containing space and used for covering part of the dielectric window. The above scheme can solve the problem that part of the wafer cannot meet the processing requirements when the semiconductor process equipment processes the wafer.