208 results about "High current density" patented technology

The invention provides an electrolyte for quickly charging a sodium-ion battery without a negative electrode. The electrolyte comprises a sodium salt, a solvent and an additive. According to the electrolyte, metal oxide nanoparticles are introduced as a first additive, and a second additive is supplemented, so that rapid desolvation of sodium ions on an electrode interface and improvement of the ionic conductivity of an electrolyte body are realized at the same time, and compact and dendrite-free sodium deposition under high current density is realized. The negative-electrode-free sodium-ion battery prepared from the electrolyte can be quickly charged, and good cycling stability and high capacity retention ratio can be maintained, so that the use requirements of people can be met.

The invention provides an X-ray absorption spectrum characterization system and an X-ray absorption spectrum characterization method for electrochemical reaction under a high-current working condition. A high-current electrochemical workstation provides current density not lower than that of a working condition electrolytic tank; the working condition electrolytic tank comprises a working electrode chamber and a counter electrode chamber which are oppositely arranged, and an ion exchange membrane arranged between the working electrode chamber and the counter electrode chamber; the working electrode chamber comprises a current-conducting plate made of a metal sheet, a working electrode loaded with a catalyst is arranged on one side, facing the ion exchange membrane, of the current-conducting plate, and a hollow flow channel is formed in the central area of the working electrode chamber; the working electrode chamber further comprises an X-ray window sheet for transmission of incident X-rays and fluorescent X-rays generated by the catalyst; the counter electrode chamber is provided with an electrolyte flow channel, and a counter electrode is arranged on one side, facing the ion exchange membrane, of the counter electrode chamber; and the electrolyte control system is used for realizing circulating flow of the electrolyte. Under the working conditions of high current density, strong bubble effect and high X-ray absorption, in-situ, real-time and high signal-to-noise ratio characterization of the microstructure of the catalyst can be realized.

The invention discloses an electrolytic tank performance analysis method based on polarization feature recognition. The method comprises the steps that S1, electrolytic tank parameters are set, electrochemical testing is conducted, and EIS impedance data are obtained; s2, preprocessing the EIS impedance data: performing Kramers-Kronig verification on the EIS impedance data, calculating a relative residual error of the data, and selecting a regularization parameter lambda; s3, applying the EIS impedance data to DRT quantitative analysis: converting the EIS impedance data into a DRT spectrogram based on discretization of a radial basis function and a Tikhonov regularization method; and S4, performing DRT spectrogram identification by using a DRT method, establishing an ECM model, and evaluating the influence of metal cation pollution on PEMWE performance degradation by using the ECM model. According to the electrolytic cell performance analysis method based on polarization feature recognition, the core problem that all polarization processes and the evolution rule of the polarization processes in performance degradation are difficult to accurately analyze under the condition of high current density in the prior art is solved.

The invention discloses a ternary positive electrode material as well as a preparation method and application thereof, and belongs to the technical field of lithium ion batteries. The method comprises the following steps: modifying a ternary matrix material in a composite doping manner of rare earth elements and transition metals, and then coating the surface of the material with a layer of amorphous ferric fluoride in a manner of combining atomic layer deposition with fluorination reaction. The ternary positive electrode material provided by the invention has higher rate capability and better cycling stability, and can maintain better chemical performance under high current density, so that the problems of capacity loss and poor electrical performance of the ternary positive electrode material of the lithium battery in a high-voltage long-cycle process are greatly relieved.

The invention belongs to the technical field of hydrogen production by water electrolysis, and discloses a device and a method for hydrogen production by alkaline water electrolysis enhanced by active ions regulated and controlled by a magnetic field. An anode magnetic flow channel and an anode non-magnetic substrate in the electrolytic cell are integrally designed and are combined to form an anode magnetic field functional bipolar plate, and the anode magnetic flow channel is formed. In the electrolysis operation process, the migration behavior and spatial distribution of iron ions dissolved in the electrolyte are actively regulated and controlled by applying an external magnetic field to the anode region, so that the iron ion concentration of the electrolyte phase is not increased, and the main body structure and material system of the existing industrial electrolytic cell are not changed; and the dissolved iron ions are directionally enriched on an anode interface. Through the regulation and control, relatively high dynamic iron active site coverage can be maintained on the surface of the anode, the polarization loss of oxygen evolution reaction is reduced, and the efficiency and stability of the process of hydrogen production by alkaline water electrolysis under the conditions of high current density and wide load operation are improved.

An electrocatalyst comprising a layered double hydroxide is disclosed, wherein the layered double hydroxide comprises intercalated charge-balancing anions and at least some of the charge-balancing anions are basic anions. The electrocatalyst is useful for alkaline seawater electrolysis (ASWE), and the latter can demonstrate stable operation at a high current density.

This invention provides a cobalt foam-carbon nanotube composite cathode material, its preparation method, and its applications, relating to the field of cathode material preparation technology. The composite cathode material of this invention is obtained by depositing a carbon nanotube array on a cobalt foam substrate. As a cold cathode material for field emission, this composite cathode material exhibits low turn-on and threshold electric fields, high current density, excellent field emission performance, and excellent current stability, meeting the performance requirements of field emission cathode materials. Furthermore, the preparation method of this composite cathode material is safe and simple. This invention provides a novel cathode material solution for high-performance, long-life vacuum electronic devices, with promising application prospects.

This invention provides a NiCoB-P-F high-efficiency hydrogen evolution electrocatalyst, its preparation method, and its application. The catalyst uses a monomeric NiCoB substrate, on which phosphorus (P) and phosphorus (F) elements are co-doped. The mass ratio of P to F is (2-6):(1-3). The raw material for P doping is NaH₂PO₂; the raw material for F doping is NH₄F. The method employs a vapor deposition process to co-dope P and F elements onto the monomeric NiCoB substrate. The hydrogen evolution electrocatalyst of this invention enhances the electrocatalytic performance of the hydrogen evolution reaction under alkaline conditions, with an overpotential η... 10 As low as 25mV, η 300 With a voltage as low as 134mV, it can significantly reduce the hydrogen evolution overpotential under high current density, thereby improving the overall catalytic efficiency and stability.

Provided is a catalyst layer in which power generation performance is improved even in a high output power region (high current density region). A cathode catalyst layer (5) and an anode catalyst layer (6) for a membrane-electrode assembly of a solid polymer fuel cell, the cathode catalyst layer (5) and the anode catalyst layer (6) containing catalyst particles (1), an electrically conductive carrier (2), a polymer electrolyte (3), and a fibrous substance (4), the fibrous substance (4) containing at least one of an electron conductor and a proton conductor, the specific surface area of the fibrous substance (4) being in a range of 40 m 2 / g or more and 80 m 2 / g or less.

The invention relates to a power supply module, a power supply system and electronic equipment, the power supply module comprises a substrate and an integrated inductor, the integrated inductor is electrically connected with the substrate, the integrated inductor comprises a magnetic core and at least two phases of windings, the magnetic core is arranged on the substrate, the at least two phases of windings are arranged in the magnetic core at intervals, and the windings comprise a primary winding and a secondary winding; the primary winding is coupled with the secondary winding; the primary winding is used for being electrically connected with a computing chip assembly in a power supply system, and the secondary windings of the at least two phases of windings are connected in series. The power supply module provided by the invention has relatively good transient performance, can ensure quick response to voltage change, has relatively high current density, has relatively high regulation efficiency and stability, ensures safe and stable operation of electric equipment, and is suitable for popularization and application. And the transient requirement and the current density requirement of the computing chip assembly in the power supply system on the power supply can be simultaneously met.

This invention discloses a type of sodium titanate with a layered crystal structure, its preparation method, and its application in aqueous magnesium-ion batteries, belonging to the field of aqueous magnesium-ion battery technology. This invention uses sodium titanate with a layered crystal structure as the negative electrode material in aqueous magnesium-ion batteries. Due to its excellent chemical and structural stability, sodium titanate can achieve reversible magnesium deposition in aqueous magnesium electrolytes. 2+ Intercalation / extraction. This invention synthesizes Na via a hydrothermal method and a high-temperature annealing process. 2 Ti 2 O 5 And Na 2 Ti 3 O 7 Materials. In magnesium chloride electrolyte, both sodium titanate materials exhibit extremely low charge / discharge potentials (Na). 2 Ti 2 O 5 -1.3 to -0.6V vs. SCE; Na 2 Ti 3 O 7 (-1.5 to -1V vs. SCE) and good cycle stability. Furthermore, Na... 2 Ti 2 O 5 The half-cell exhibits a charge-discharge specific capacity of up to 213 mAh / g at a current density of 2 A / g, and maintains a high specific capacity of 150 mAh / g even at a high current density of 10 A / g. The sodium titanate of this invention is an ideal anode material for aqueous magnesium batteries, possessing both low cost and environmental friendliness, and shows great promise for application in the field of aqueous magnesium-ion energy storage.

The present disclosure provides a nitride semiconductor transistor capable of improving current density. The nitride semiconductor transistor includes: a first channel layer having a first upper surface having nitrogen polarity; the ferroelectric nitride semiconductor layer is positioned on the first upper surface and is provided with a second upper surface with metal polarity; the second channel layer is positioned on the second upper surface and is provided with a third upper surface with metal polarity; and the first barrier layer is positioned on the third upper surface and is provided with a fourth upper surface with metal polarity.

The utility model belongs to the field of electrolyzed water clamps, and particularly relates to a temperature-controllable electrolyzed water clamp which comprises two insulating plates, two flow guide plates arranged between the opposite sides of the two insulating plates, and two bipolar plate assemblies arranged between the opposite sides of the two flow guide plates. Two sealing gaskets are arranged between the opposite sides of the two bipolar plate assemblies, and titanium felts are arranged on the inner sides of the two sealing gaskets; by arranging the bipolar plate assembly and installing the temperature sensor main body and the heating rod main body in the bipolar plate of the water flow channel, the temperature of the electrolyte in the bipolar plate can be controlled, on one hand, the resistance of the electrolyte can be reduced and the energy consumption can be reduced through heating, and on the other hand, the current density can be improved through the proper temperature, so that the electrolysis rate is increased; the problems that the internal temperature of an existing water electrolysis clamp is inconvenient to control, the electrolyte speed is slowed down in a low-temperature environment, energy consumption is increased, the electrolysis efficiency is reduced, and meanwhile the equipment failure risk is increased are solved.

The application discloses a cathode roller off-line grinding method for 4.5-5 mu m ultra-thin lithium battery copper foil production, and belongs to the technical field of electrolytic copper foil. The method adopts 120 mesh and 320 mesh silicon carbide grinding wheels with Shore hardness of 90-95 HD for rough grinding in turn under a closed dust-free environment, and adopts 600 mesh, 800 mesh and 1000 mesh silicon carbide grinding wheels with Shore hardness of 85-90 HD for fine grinding in turn; the grinding wheels are first flattened by a turning tool before grinding, and the deionized water with an electric conductivity of less than or equal to 0.5 mu s / cm is used for high-pressure flushing after rough grinding and fine grinding; the parameters of special rotating speed, pressure, displacement speed and stroke frequency are matched throughout the process. The surface roughness Ra of the cathode roller after grinding is 0.12-0.14 mu m, the mirror surface effect is excellent, the pinholes of the ultra-thin lithium battery copper foil can be effectively inhibited under high current density, the crystal uniformity and compactness of the copper foil are improved, and the cathode roller is suitable for efficient and high-quality production of 4.5-5 mu m ultra-thin lithium battery copper foil.

This invention provides a coreless stator for a high current density axial flux motor and an axial flux motor. The coreless stator of the high current density axial flux motor includes at least one stator winding layer, which includes several circumferentially spaced and independent conductive coil units. In each stator winding layer, several conductive coil units are processed on a conductive substrate using a subtractive process. Each conductive coil unit includes a planar working portion extending straight in a radial plane, an outer transition line portion connected to the outer end of the planar working portion, and an inner transition line portion connected to the inner end of the planar working portion. At least one of the outer transition line portion and the inner transition line portion is bent wholly or partially relative to the planar working portion, thereby forming a three-dimensional transition line portion. This directly releases the radial plane space occupied by the outer transition line portion and the inner transition line portion, thereby significantly increasing the radial width and total area of ​​the effective electromagnetic working area and achieving a significant improvement in torque and power density.

The present disclosure relates to bitter plate-based magnet devices and a reactor apparatus using same. The reactor apparatus may comprise the magnet devices. The magnet device may comprise: an upper lead plate; a plurality of conductor plates; a plurality of insulator plates; and a lower lead plate. The magnet device can be formed to have a central hole. The conductor plates and the insulator plates can be stacked such that each insulator plate is disposed between two conductor plates. Each conductor plate can be formed to have a radial slot, and each insulator plate can be formed to have a radial slot that is wider in width in the circumferential direction than the radial slot of the conductor plate. According to the present disclosure, a bitter plate-based reactor apparatus is implemented such that high current density can be achieved and a miniaturized reactor can be fabricated.

The application discloses a method for preparing high-dispersed nickel-silicon oxide particles on the surface of YSZ particles, and the method comprises the following steps: loading nickel oxide on the surface of YSZ (Ni / YSZ) by using an impregnation method, and coating a uniform and dense amorphous SiO2 film on the surface of the Ni / YSZ particles by using a chemical vapor deposition method; the film is in close contact with the nickel oxide, and after high-temperature calcination at 1400 DEG C, the film becomes spherical small particles and is uniformly dispersed on the YSZ framework. The uniformly distributed nickel-silicon oxide particles on the surface of YSZ prepared by the method can effectively inhibit the agglomeration of Ni in the water and heat cycle of the battery, and can significantly improve the current density.

The application discloses a kind of silk powder isomeric electromagnetic jet additive manufacturing device and method, belong to material surface jet technical field.It includes shell and stirring needle, the lower end of stirring needle is provided with powder outlet and the gas powder passage compatible with the powder outlet, further include: fixedly installed in the needle sleeve of shell, the lower end of needle sleeve penetrates out of shell and is equipped with first spinneret;Fixedly installed in the guide wire shaft of shell, the lower end of guide wire shaft penetrates out of shell and is equipped with second spinneret;Fixedly installed on the yarn feeding assembly of shell, two metal wires in yarn feeding assembly are respectively connected with the positive and negative poles of power supply.Two metal wires are used as self-consumption electrode, when two metal wires penetrate out of shell and contact each other, short circuit is generated, due to high current density, electric arc is generated between two metal wires, the end of two metal wires is simultaneously melted, the particle generated by melting is wrapped on metal powder to form core-shell structure material, promote metal powder and substrate material to form more firm combination.

The application relates to a sulfide solid electrolyte and a preparation method and application thereof, and the composition is 70R2S-(30-x)SiS2-xM a O b , wherein R is Li or Na, x is 0.1-10, M a O b is a metal oxide, and a and b are natural numbers. The sulfide solid electrolyte of the application improves ion conductivity by adding a metal oxide as a network modifier in a Li2S-SiS2 sulfide solid electrolyte system. The solid electrolyte of the application has the characteristics of electrochemical stability and environmental friendliness, and provides a solid electrolyte material for a full solid-state secondary battery which has higher charge-discharge capacity while inhibiting the generation of hydrogen sulfide and can be charged and discharged at a higher current density.

The invention discloses a sectional type grid-control Darlington transistor device structure and a manufacturing method thereof. The sectional type grid-control Darlington transistor device structure comprises a substrate P-Sub; a first N-Drift region is arranged in the substrate P-Sub; a first NW region, a first PW region and a second PW region are arranged above the N-Drift region; a first P + injection region and a first N + injection region are arranged in the first NW region; a second N + injection region, a second P + injection region and a third N + injection region are sequentially arranged in the first PW region from left to right; a third P + injection region, a fourth N + injection region and a fourth P + injection region are arranged in the second PW region; a first polysilicon gate is arranged between the second field oxide isolation region and the second N + injection region; therefore, the MOS current is amplified through the current gain of the two-stage NPN transistor, and an outflow channel is provided for carriers stored in the drift region through the sectional anode structure, so that the rapid turn-off of the device is realized, and the grid-control bipolar device with high current density and low turn-off loss is formed.

A power converter includes a first circuit, a second circuit, a first set of capacitors, a second set of capacitors, and a first inductance unit. The first circuit includes a first driver on a first substrate and a first switch pair forming a first switch node. The second circuit includes a second driver on the first substrate and a second switch pair forming a second switch node. The first group of capacitors is located at the bottom of the first substrate, and the second group of capacitors is located at the top of the second substrate opposite to the bottom of the first substrate. The first inductance unit includes a plurality of connection channels connecting nodes on the first substrate to corresponding nodes on the second substrate, a first inductance winding connected to the first switching node, a second inductance winding connected to the second switching node, and a first magnetic core.

This invention belongs to the field of semiconductor technology, specifically providing a gallium oxide insulated-gate bipolar transistor (IGBT) power device, including a vertical device and a horizontal device. This invention uses nickel oxide, copper oxide, or diamond as the P-type region, forming a heterojunction structure with N-type gallium oxide. During device operation, the heterojunction on the high-potential side is forward-biased, allowing a large number of holes to be injected into the N-type gallium oxide drift region. This introduces a conductivity modulation effect in the drift region, achieving high current density and low on-state voltage drop, thus realizing the basic working principle of the IGBT device. Simultaneously, the horizontal IGBT introduces P-type nickel oxide or diamond with N-type gallium oxide to form a superjunction structure with a high-voltage drift region, achieving higher breakdown voltage with the same drift region length, thus improving device performance. In summary, this invention, based on the principle of heterojunction, proposes the concept of gallium oxide IGBT for the first time, providing a new approach for the research of gallium oxide high-voltage, high-current power devices.

The invention discloses a fuel cell stack gas cavity drainage optimization design method and structure, which is characterized in that a liquid water accumulation area is positioned by analyzing the flow velocity and pressure distribution condition of a manifold in a stack and combining the actual stack operation condition, and accumulated liquid water is driven to be directionally discharged out of the stack by using the pressure difference in the gas cavity manifold. Meanwhile, the drainage capacity can be cooperatively controlled with the operation conditions of the electric pile, the performance of the electric pile can be remarkably improved when more water is produced under the working condition of high current density, and the voltage distribution uniformity is improved. In the embodiment of the invention, the electric pile drainage structure suitable for engineering use is provided based on the design method, the drainage structure is arranged in the electric pile without occupying the space of the manifold in the electric pile, and the drainage structure can be matched with the length change of the reactor core caused by the external environment to a certain extent; and the method is especially suitable for optimization design of high-performance high-power galvanic piles.

The invention belongs to the technical field of preparation of solid-state lithium ion electrolyte materials, and relates to an all-solid-state lithium ion electrolyte material, a preparation method thereof and an electrochemical element. The chemical formula of the all-solid-state lithium ion electrolyte material is Li < 7 > La < 3-m-n > Er < m > Y < n > Zr < 2-x-y > Ta < x > Nb < y > O < 12 >, m ranges from 0.1 to 0.5, n ranges from 0.1 to 0.5, x ranges from 0.1 to 0.25, and y ranges from 0.1 to 0.25. The invention also discloses a preparation method of the all-solid-state lithium ion electrolyte material, the La element in the LLZO is replaced by Er and Y, and the Zr element in the LLZO is replaced by Ta and Nb elements, so that the effect of stabilizing the cubic phase structure of the LLZO is achieved; a spark plasma sintering method is combined with a grain size distribution method, the electrolyte is rapidly sintered to be compact, grain growth of the electrolyte under long-time high-temperature sintering is avoided, the grain size distribution design effect is kept, and the cycling stability of the electrolyte under high current density is enhanced.

The invention discloses a high-current-density copper electroplating solution for a circuit board and a preparation method and application of the high-current-density copper electroplating solution, and relates to the technical field of printed circuit board production. The high-current-density copper electroplating solution for the circuit board is prepared from the following components in mass concentration: 150 to 300 g / L of copper sulfate, 50 to 150 g / L of sulfuric acid, 30 to 100 mg / L of chloride ions, 0.1 to 1.0 g / L of 1, 4-butynediol, 0.5 to 5 g / L of a brightening agent, 5 to 30 g / L of a wetting agent, 2 to 20 g / L of a leveling agent, 0.5 to 3 g / L of an accelerator, 0.5 to 2 g / L of a buffering agent and the balance of deionized water. According to the high-current-density electrocoppering solution for the circuit board and the preparation method and application of the high-current-density electrocoppering solution, the reduction speed of copper ions on the surface of a cathode (workpiece) can be remarkably increased under the high current density, so that faster copper layer deposition is achieved, the electroplating period is shortened, the overall production efficiency is improved, meanwhile, consumption of copper balls can be reduced, and cost is saved.

This invention provides an integrated photochargeable zinc-ion supercapacitor, comprising a photoelectric positive electrode, a zinc negative electrode, and a gel electrolyte. The preparation method involves: spraying a TiO2 colloidal solution onto FTO glass to form a TiO2 mesoporous film; then spraying an Ag-np@MXene colloidal solution onto it to obtain a TiO2 / Ag-np@MXene photoelectric positive electrode; fixing a zinc sheet onto the conductive surface of another FTO glass; and sequentially stacking the zinc sheet, gel electrolyte, and TiO2 / Ag-np@MXene photoelectric positive electrode fixed on the FTO glass, and encapsulating them to obtain the integrated zinc-ion photochargeable capacitor. This invention significantly enhances the pseudocapacitive performance of MXene through silver nanoparticles and utilizes the synergistic effect of Ag-np and TiO2 to enhance the electrochemical energy storage capacity under illumination. The energy level matching between the composite electrode materials achieves efficient separation and photoelectric conversion of photogenerated carriers. This photocharged zinc-ion capacitor exhibits excellent photoelectrochemical performance, with a significantly increased specific capacitance under illumination, maintaining good light-assisted energy storage performance at high current densities, and stable light gain capability after long-term cycling.

The application belongs to the technical field of hydrogen production by water electrolysis, and relates to a crack-free nickel-molybdenum hydrogen evolution electrode and a preparation method and application thereof. First, the surface of a conductive substrate such as foamed nickel is pretreated by acid pickling and alcohol washing to remove the oxide layer and oil stains; then, the pretreated conductive substrate is used as a cathode, a direct current power supply is used as a plating power supply, and a nickel-molybdenum plating layer is plated in a low-concentration NiMo plating solution at a high current density. The low-concentration NiMo plating solution and the high current density can effectively avoid the cracking of the nickel-molybdenum plating layer. Compared with the cracked nickel-molybdenum electrode obtained by the traditional plating method, the electrode is free of cracks, the surface is more rough and uneven, and the hydrogen evolution activity and stability are both significantly improved. The method is simple to operate, low in production cost, and stable in catalytic layer structure. The hydrogen evolution catalytic activity electrode prepared by the method has a wide application prospect in the alkaline water electrolysis industry.

The invention belongs to the technical field of proton exchange membrane fuel cells, and particularly relates to a method for improving membrane electrode performance of a fuel cell through ionomer heat treatment. According to the method, the ionomer in the catalyst layer is subjected to heat treatment for 120-240 minutes at the temperature of 100-120 DEG C, so that ether bonds in ionomer molecules are broken, hydrophilic sulfonic acid branched chains are reduced, and the hydrophobicity of the catalyst layer is enhanced. Compared with the prior art, the membrane electrode treated by the method disclosed by the invention shows remarkably improved drainage capacity and oxygen mass transfer performance, the problem of water logging under high current density is effectively relieved, and the output performance and operation stability of a battery in a large current area are remarkably improved. The method does not need to change the existing material system and production process, and is simple and convenient to operate, low in cost and suitable for large-scale application.

The invention discloses a preparation method of an electrolyte of a high-voltage, high-current-density and high-stability aqueous alkaline zinc-iron flow battery in the field of flow batteries. The electrolyte is prepared by blending potassium diethyltriamine pentaacetate, zinc ions and potassium salt. According to the invention, the charge / discharge voltage of the zinc-iron flow battery in the cycle process and the cycle stability of the zinc-based flow battery under high current density are greatly improved, and the phenomena of hydrogen evolution and zinc dendrite of the zinc negative electrode in the existing alkaline aqueous zinc-iron flow battery are inhibited.

The utility model relates to circuit board processing technical field discloses a kind of circuit board plating layer thickness control fixture device, including the mounting bracket for supporting, the fixed component for being used to clamping circuit board is installed in the lower end of mounting bracket, the shielding component for being used to suppress circuit board edge effect is installed in the upper end of fixed component.The utility model is through the even clamping of fixed component circuit board four around, improve conductive uniformity, effectively reduce edge high current density area, suppress plating layer edge thickening phenomenon, shielding component is automatically turned over to board piece two sides when clamping, pass through physical shielding optimization power line distribution, both suppress board edge current gathering effect, and promote current to board piece center and hole permeation, to significantly improve the consistency of board face and hole plating layer thickness, realize the overall plating layer uniformity comprehensive improvement.