117 results about "Coulomb" patented technology

The present application provides a kind of silicon-carbon negative electrode material and its preparation method.The silicon-carbon negative electrode material includes carbon skeleton with pore structure and silicon-based material arranged in the pore structure, in the region from the surface of the silicon-carbon negative electrode material to the inside extending 10nm from the surface, the content of high-valence silicon is less than 25% relative to the total amount of low-valence silicon and high-valence silicon, wherein the low-valence silicon is 0-valence to 2-valence silicon, and the high-valence silicon is 3-valence to 4-valence silicon.Thereby, the lithium extraction gram capacity and the first coulomb efficiency of the silicon-carbon negative electrode material can be improved, and the discharge gram capacity and the first coulomb efficiency of the secondary battery can be improved.

The invention relates to a field effect transistor channel mobility determination method and device and computer equipment. The method comprises the following steps: acquiring a transfer characteristic curve of a target field effect transistor; determining a target effective electric field intensity interval corresponding to the grid voltage of the target field effect transistor according to the transfer characteristic curve of the target field effect transistor; determining the transistor body mobility of the target field effect transistor according to the body mobility model; based on the target effective electric field intensity interval, the coulomb scattering mobility, the phonon scattering mobility and the surface roughness scattering mobility of the target field effect transistor are determined according to a target coulomb scattering mobility model, a target phonon scattering mobility model and a target surface roughness scattering mobility model; and determining the channel mobility of the target field effect transistor based on a channel mobility model. According to the scheme, the performance of the device can be quickly and effectively evaluated, complex analysis testing is avoided, and the development speed of the device process is increased.

The invention discloses an S-type three-dimensional carbon nitride / copper sulfide nanosphere heterojunction as well as a preparation method and application thereof, and belongs to the field of antibacterial application of nano materials. The three-dimensional porous carbon nitride not only can increase photocatalytic active sites, but also can improve close contact with copper sulfide. The copper sulfide nanospheres and the three-dimensional porous nanosheets construct an S-shaped heterojunction, and efficient separation of photo-induced electrons and hole pairs can be driven under the action of a built-in electric field, band edge bending and coulomb force. The S-type three-dimensional carbon nitride / copper sulfide nanosphere heterojunction can generate more active oxygen species to inactivate bacteria through a photocatalysis-Fenton-like reaction; in addition, the photothermal effect of copper sulphide has a certain auxiliary sterilization effect. Under the conditions of visible light irradiation and trace hydrogen peroxide, the inactivation rates of the S-type three-dimensional carbon nitride / copper sulfide nanosphere heterojunction on staphylococcus aureus and escherichia coli are up to 99.5% and 99.7% respectively, and meanwhile, the S-type three-dimensional carbon nitride / copper sulfide nanosphere heterojunction has a remarkable treatment effect on wounds infected by staphylococcus aureus.

The invention discloses a zinc negative electrode plate with a three-dimensional copper foil substrate and a preparation method and application thereof, relates to the technical field of aqueous zinc ion batteries, and provides a preparation method of a three-dimensional copper foil substrate loaded zinc positive electrode aiming at the problems of short cycle life, low coulombic efficiency and the like caused by dendritic crystal growth and side reaction of an aqueous zinc ion battery zinc negative electrode. A three-dimensional porous structure is constructed on a zinc-loving copper foil substrate through a wet chemical method, and the method comprises the following specific steps: (1) immersing a copper foil into an acidic solution containing ferric trichloride hexahydrate for reaction to prepare a three-dimensional porous copper foil; and (2) taking a three-dimensional copper foil (3D Cu) as a substrate, and loading zinc metal through an electroplating process to obtain the three-dimensional copper foil substrate galvanized negative electrode (3D Cu-Zn). The three-dimensional porous structure can balance electric field distribution, induce uniform deposition of zinc ions, inhibit dendritic crystal growth and optimize current distribution.

The invention relates to the technical field of lithium ion batteries, in particular to a doped lithium-rich manganese-based positive electrode material and a preparation method thereof, the molecular formula of the doped lithium-rich manganese-based positive electrode material is LiaNibCocMndAWBxCyDzO2, 1.13 < = a < = 1.20, 0.10 < = b, c and d < = 0.80, 0.001 < = w, and x, y and z < = 0.03; wherein A is one or more of high-valence transition metal elements such as W < 6 + >, Mo < 6 + >, Ta < 5 + >, Nb < 5 + > and Ti < 4 + >, B is one or more of rare earth elements such as La < 3 + >, Y < 3 + > and Ce < 4 + >, C is one or more of alkaline earth elements such as Sr < 2 + >, Mg < 2 + > and Ba < 2 + >, and D is one or more of alkaline metal elements such as Li < + >, Na < + > and K < + >. According to the technical scheme, the synergistic effect of multiple elements is achieved, the comprehensive performance such as the first coulombic efficiency and the cycling stability of the lithium-rich manganese-based positive electrode material can be remarkably improved, the preparation method is simple, the lithium-rich manganese-based positive electrode material can be prepared through simple mixing and multi-element synergistic doping solid-phase sintering, the requirement for equipment is low, and the application range is wide. And large-scale popularization of the process is facilitated, and the market competitiveness of the product is improved.

A method for estimating battery impedance and remaining energy in a battery system, including a group of battery cells, includes periodically measuring current and voltages of all battery cells in the group of batter cells for a time period. The method also includes determining a present current value in accordance with averaging the measured current and voltages over the time period. The method further includes detecting a step change in a current based on a comparison of the present current value with one or more previously stored current vales. The method still further includes initiating an impedance measurement event in accordance with validating the step change.

The invention relates to the technical field of digital measurement, and discloses a coulombmeter monitoring system and a coulombmeter monitoring method for dynamic calibration of multiple strings of lithium battery packs, and the coulombmeter monitoring method for dynamic calibration of the multiple strings of lithium battery packs comprises the following steps: a dynamic calibration module carries out dynamic calibration on the multiple strings of lithium battery packs according to pre-stored calibration parameters; a single voltage signal and a charging and discharging current signal are accurately calibrated, the measurement error of the battery in the charging and discharging process and the gain error and noise interference in current measurement are eliminated, the single voltage and the charging and discharging current are accurately monitored and dynamically calibrated, and then the state parameters of the multi-string lithium battery pack are accurately calculated. Accurate control over the charging and discharging process is achieved, abnormal conditions such as over-charging and over-discharging of the batteries can be avoided, and the monitoring reliability of the multi-string lithium battery pack is improved.

This invention discloses a method and device structure for improving the electrical transport properties of etched graphene quantum dots, belonging to the field of low-temperature transport testing technology. The method includes the following steps: fabricating etched graphene quantum dot devices; performing preliminary electrical transport characterization by cooling; and undergoing several cycles of "sample electrode grounding protection – heating to above 200K or room temperature – cooling again – electrical transport characterization" to improve the electrical transport properties of the device, enabling subsequent observation and manipulation of the quantum dot's fine charge stability map. The optimized method of this invention, through several heating and cooling thermal cycles, successfully adjusts the coulomb blocking region of the graphene quantum dots from hundreds of volts towards zero, facilitating the application of a gate voltage. Furthermore, the charge stability map of the two quantum dots is significantly optimized and improved, greatly increasing the yield of etched graphene quantum dot devices. In addition, the optimized method of this invention is simple to operate and has significant effects, making it suitable for widespread application.

The present invention discloses a recessed-gate enhancement-mode GaN-based HFET device, comprising a substrate and a GaN layer disposed above the substrate. A source, a drain, and a T-shaped gate are disposed above the GaN layer. A barrier layer is disposed between the source and drain electrodes. The barrier layer comprises a barrier layer body, a source-end doped region, and a drain-end doped region. The source-end doped region and the drain-end doped region are connected to the source and drain electrodes, respectively, via an ohmic contact process. The source-end doped region and the drain-end doped region are doped with metal atoms with large atomic radii. An AlN intercalation layer is disposed between the barrier layer and the GaN layer, and a passivation layer is disposed on the upper surface of the barrier layer. By employing the above-described technical solution, the strain of the barrier layer near the ohmic contact can be altered by doping the barrier layer with metal atoms with large atomic radii, thereby changing the magnitude of polarization Coulomb field scattering associated with the barrier layer strain, thereby adjusting the gate-source channel resistance and improving the performance of GaN-based HFETs.

The present invention relates to a lightning protection system based on Coulomb's law, belonging to the field of lightning prevention technology. It comprises: a lightning conductor and a discharge ground wire for attracting lightning to a predetermined lightning strike object; an energy storage capacitor for charging the lightning conductor; a high-voltage DC power supply for charging the conductor; an electric voltage regulator for adjusting the voltage according to the intensity of lightning; a power supply for providing power to the high-voltage DC power supply and the overvoltage protection trigger controller; and a spherical gap discharge and protection circuit for ensuring the overvoltage safety of the entire circuit. The lightning protection system of the present invention can effectively avoid damage to humans caused by lightning and ensure the safety of people's lives and property. In addition, the lightning protection system of the present invention has a simple structure, is easy to install, and has good social and economic benefits.

This application relates to a negative electrode material, and to a negative electrode, electrochemical apparatus, and electronic apparatus using the material. Specifically, this application provides a negative electrode material comprising graphite, wherein the I-stage lithium insertion platform potential P1 of the negative electrode material is 30mV to 75mV, and the II-stage lithium insertion platform potential P2 is 90mV to 110mV. By adopting the negative electrode material of this application, the cycle performance of electrochemical apparatus using it under high voltage and high temperature conditions can be significantly improved, the Coulomb capacity of the negative electrode material can be increased, and the initial efficiency of the negative electrode material can be achieved simultaneously.

The application discloses a kind of customized microporous hard carbon negative material and its preparation method and application, belong to electrochemical energy storage material technical field.The preparation method includes the following steps: S01, deposition substrate is laid in reactor, then reactor is placed in deposition device, and reaction agent is introduced to carry out reaction, after reaction, cooling to room temperature, and initial sample is obtained;S02, the initial sample obtained in step S01 is taken out, and solvent is added to initial sample for soaking;After soaking is completed, suction filtration, drying, heating, and after cooling, customized microporous hard carbon negative material is obtained.The specific surface area of the customized microporous hard carbon negative material of the application is large, has rich open micropore below 1nm, is conducive to improving the initial coulomb efficiency of sodium ion battery;At the same time, micropore adsorbs more capacity of sodium ion, and electrochemical performance is high and rate performance is excellent;The application overcomes the problem of low initial coulomb efficiency with high specific surface area in the past, and has high cycle stability.

The application provides a kind of zero-dimensional-one-dimensional composite positive electrode material and its preparation method and application, belong to battery positive electrode material field.The zero-dimensional-one-dimensional composite positive electrode material provided by the application includes nanoparticle positive electrode material and nanofiber positive electrode material;The mass ratio of the nanoparticle positive electrode material and nanofiber positive electrode material is 1: (0.2~1.5).The zero-dimensional-one-dimensional composite positive electrode material provided by the application is applied as active material in lithium ion battery positive electrode sheet, can make the first coulomb efficiency of half-cell reach 84.23%, with higher first coulomb efficiency;The specific capacity under 0.1C rate can reach 270.29mAhg ‑1 , with high specific capacity;The specific capacity under 8C high rate can still be kept at 82.03mAhg ‑1 , with excellent rate performance;Capacity retention rate can reach 86.68% after 300 cycles under 2C rate, with good cycle stability.

The invention relates to a multi-particle beam system (1) with better resolution and faster recording speed. To this end, an electrostatic enhancement lens (112) is disposed in an upper focal plane where the objective lens (102) intersects with the primary particle beam. The electrostatic enhancement lens (112) is used in a targeted manner to significantly increase the kinetic energy of the primary beam (3) in the intersection region (108), which is a cause of what reduced coulomb interaction between charged particles.

This invention relates to a silicon-carbon anode material and a method for manufacturing the same. The silicon-carbon anode material comprises a carbon skeleton having a porous structure and a silicon-based material provided within the porous structure, wherein the content of high-valence silicon in the region from the surface to 10 nm inward of the silicon-carbon anode material is less than 25% of the total amount of low-valence silicon and the high-valence silicon, the low-valence silicon is silicon with a valency of 0 to 2, and the high-valence silicon is silicon with a valency of 3 to 4. The silicon-carbon anode material can improve the capacity per gram and initial Coulomb efficiency in lithium desorption of the silicon-carbon anode material, and improve the capacity per gram and initial Coulomb efficiency in the discharge of a secondary battery.

The application provides a high-nickel positive electrode material and a preparation method and application thereof. The high-nickel positive electrode material is a secondary particle formed by primary grains gathering, and a crystal boundary is included between adjacent primary grains; the mass ratio of cobalt elements to nickel elements at the crystal boundary of a surface layer of the secondary particle is A, the mass ratio of cobalt elements to nickel elements at the crystal boundary of a core of the secondary particle is B, and the mass ratio of cobalt elements to nickel elements of a primary grain of the surface layer of the secondary particle is C, wherein A is greater than B, and A is greater than C. The high-nickel positive electrode material has a secondary particle surface layer crystal boundary cobalt-rich structure, can enhance the structural stability of the material, reduces the side reaction between the material and an electrolyte, and thus makes the battery have excellent discharge capacity, coulomb efficiency and capacity retention rate.

The application discloses a zinc metal negative electrode with a textured zinc sulfide solid electrolyte interface layer and a preparation method thereof, and belongs to the technical field of zinc ion batteries. The negative electrode is composed of a cold-rolled zinc base and a zinc sulfide solid electrolyte interface layer. The zinc sulfide target material is bombarded by a high-energy laser beam to cause plasma state transformation and deposition on the cold-rolled zinc base. By controlling the deposition temperature and time, cavity gas pressure, laser frequency and power, a zinc sulfide solid electrolyte interface layer with a (111) texture strength higher than 2.5 and a layer thickness of 0.3-2.0 microns can be prepared, and a zinc metal negative electrode with the interface layer is obtained. In the aqueous zinc ion battery system, the negative electrode material exhibits a cycle service life of not less than 3400 times at a current density of 5 mA / cm 2 2, and a coulomb efficiency of 99.9%. The application is used for improving the cycle service life of zinc ion batteries, and has the advantages of simple and controllable process, high product stability and durability, non-toxic process, and greatly improved service life and reliability of commercial zinc ion batteries.

The utility model relates to a cathode device and an X-ray tube. The cathode device for the X-ray tube is provided with a focusing head and an electron emitter, high voltage can be applied between the focusing head and the electron emitter, the focusing head is provided with at least one emitter well, the electron emitter is centrally arranged above the emitter well or in the emitter well, and the electron emitter is arranged in the emitter well. -wherein an emitter well taper is formed as part of the focusing head such that the width of the emitter well over the height of the electron emitter is smaller than the width below the emitter well taper,-wherein the varying cross-section of the emitter well is configured to reduce the Coulomb force acting on the electron emitter as a result of the applied high pressure.

The invention relates to the technical field of space satellite control, in particular to a satellite attitude control method based on the Coulomb force control technology, electrode balls are configured on a satellite to enable the satellite to be electrified, and rotation starting and rotation eliminating actions of the satellite are achieved through polarity conversion between the electrode balls. Meanwhile, the problem that the satellite deviates due to coulomb force control is solved, control over the position, the attitude and the distance of the satellite is achieved, and support is provided for the follow-up space satellite control technology.

The embodiment of the invention provides a model simulation method and device, electronic equipment and a storage medium. According to the scheme, the method comprises the following steps: constructing a semiconductor grid-controlled quantum dot model as a to-be-simulated model; according to the voltage on the first pumping electrode and the voltage on the second pumping electrode, lever arm coefficients corresponding to the first pumping electrode and the second pumping electrode, the target relation between the tunneling coefficient between the first quantum dot and the second quantum dot and the voltage of the barrier electrode, and the coulomb interaction coefficient between the first quantum dot and the second quantum dot are obtained; determining Hamiltonian of the to-be-simulated model based on the lever arm coefficient, the target relationship and the coulomb interaction coefficient; and simulating the to-be-simulated model based on the Hamiltonian. Through the technical scheme provided by the embodiment of the invention, simulation of the semiconductor grid-controlled quantum dot model can be realized.

The invention relates to a positive electrode material and a preparation method thereof, a positive electrode plate, a battery and an electric device, which are used for solving the problem of low coulombic efficiency of a lithium ion battery in the first charging and discharging process. The positive electrode material comprises an inner core base material, a first shell layer and a second shell layer. Wherein the inner core base material comprises a positive electrode active material; the first shell layer coats at least one part of the outer surface of the inner core base material, and the first shell layer comprises oxygen vacancies; the second shell layer coats at least one part of the outer surface of the first shell layer, and the lithium ion conductivity of the material of the second shell layer is greater than that of the core base material.

The invention relates to the technical field of battery detection, in particular to a method and system for online detection of internal resistance and polarization characteristics of a battery, and the method comprises the steps: carrying out the complete charging and complete discharging of a lithium ion battery through employing a constant small current, and recording the terminal voltage and current value at each measurement moment; calculating the state of charge of the lithium ion battery through a coulomb counting method based on the terminal voltage and the current value; for the same charge state level, terminal voltage in the charging process and terminal voltage in the discharging process are obtained respectively, actual open-circuit voltage is calculated, and effective voltage drop is calculated; establishing an equivalent circuit model of the lithium ion battery; on the basis of an equivalent circuit model, the terminal voltage is expressed as the sum of the product of the open-circuit voltage, the hysteresis voltage, the current and the internal resistance and the measurement noise, and the hysteresis resistance and the internal resistance are combined into effective resistance; and estimating parameters of the equivalent circuit model by using a least square method to obtain a coefficient vector of the effective resistance, and obtaining a hysteresis-free internal resistance estimated value. The problem that internal resistance estimation is not matched with an EIS method due to the hysteresis effect in a traditional ECM parameter estimation method can be solved.

This invention relates to the field of energy management and state of charge estimation technology for new energy unmanned aerial vehicles (UAVs), specifically to a battery SOC correction method for energy management of solar-powered UAVs. The method includes: short-time electrochemical impedance spectroscopy sampling of battery cells in a solar-powered UAV battery to determine the diffusion region area characteristics; compensating the diffusion region area characteristics based on battery temperature and a temperature compensation model to obtain compensated area characteristics; online estimation of the compensated area characteristics using a mapping model to obtain the electrochemical impedance spectroscopy state of charge; determining prior area characteristics based on the coulomb integral state of charge and the mapping model; updating the mapping model online based on the difference between the compensated area characteristics and the prior area characteristics; and fusing the coulomb integral state of charge, the electrochemical impedance spectroscopy state of charge, and the open-circuit voltage state of charge as the corrected state of charge. This invention can improve the accuracy of state of charge estimation.

Devices and methods are provided. An example device includes a dielectric having a channel extending from a first end of the dielectric to a second end of the dielectric. A first end of the channel is at the first end of the dielectric and a second end of the channel is at the second end of the dielectric. The device also includes a membrane on an exterior side of the dielectric that does not interface with the channel. Additionally, the device includes a first chamber, fluidly coupled to the first end of the channel, and a second chamber, fluidly coupled to the second end of the channel. When a fluid distributed among the first chamber, the channel, and the second chamber exhibits an ionic concentration gradient between the first chamber and the second chamber causing an ionic flow, an electric current is generated within the membrane.

This application provides a high-nickel cathode material, a method for manufacturing the same, and its applications. The high-nickel cathode material according to this application is a secondary particle formed by the aggregation of primary crystal grains, with grain boundaries between adjacent primary crystal grains, where the mass ratio of cobalt and nickel elements in the grain boundaries on the surface of the secondary particle is A, the mass ratio of cobalt and nickel elements in the grain boundaries inside the secondary particle is B, and the mass ratio of cobalt and nickel elements in the primary crystal grains on the surface of the secondary particle is C, where A is greater than B and A is greater than C. The high-nickel cathode material according to this application has a cobalt-rich structure at the grain boundaries on the surface of the secondary particle, improving the structural stability of the material and suppressing the occurrence of side reactions with the electrolyte. As a result, the battery exhibits superior discharge capacity, Coulomb efficiency, and capacity retention rate.

The invention relates to the technical field of batteries, in particular to a negative electrode material preparation method based on a negative electrode aged hard carbon material, which comprises the following steps: firstly, crushing and grading an aged hard carbon precursor to obtain particles with a preset particle size; the preparation method comprises the following steps: performing pretreatment such as acid washing, alkali washing, water washing and ethanol washing, mixing a purified precursor with a coating material in proportion to form a uniform coating layer, pre-sintering in a protective atmosphere, and preliminarily stabilizing a material structure by controlling parameters such as a heating rate; and carrying out specific surface area detection on the pre-sintered primary product, and dynamically adjusting pre-sintering process parameters according to the specific surface area detection to ensure that the pore structure of the material reaches the standard. And performing high-temperature carbonization treatment on the material meeting the standard so as to repair the carbon layer structure and improve the conductivity. And finally, performing quality judgment by detecting the first coulombic efficiency of a finished product. According to the invention, the first coulombic efficiency, the specific capacity and the cycling stability of the regenerated hard carbon material are improved, and the recycling of the aging material is realized.

The application relates to a method for realizing beam expansion and divergence angle compression by a quadrupole magnet and a solenoid, which is used for controlling high-energy electron beams generated by an accelerator, eliminating the influence of the Coulomb force of the electron beams and weakening the divergence angle of the electron beams. The method realizes electron beam expansion and primary compression of the divergence angle by four fixed permanent quadrupole magnetic rings and one electric quadrupole magnetic ring, and realizes ultimate compression of the beam divergence angle by one composite solenoid electromagnet. The electron beam radius is expanded from the millimeter level to the centimeter level in a very short distance, the influence of the Coulomb force is reduced by 1-2 orders of magnitude, and the increment of the divergence angle is controlled in the 0.01 mrad level. The initial divergence angle of the electron beam is compressed from the 1 mrad level to the 0.1 mrad level, and theoretically, the beam spot can be compressed from the meter level to the 10 cm level when the electron beam is transmitted for 1 km, so that the transmission distance of the electron beam is greatly increased.

The present application relates to the technical field of battery power, in particular to a kind of unmanned aerial vehicle countermeasure gun battery power display method and system based on coulomb meter, including the battery pulse current is collected by electromagnetic shielding type coulomb meter, based on pulse rising edge triggers dynamic variable sampling rate mechanism, generates pulse charge quantity;The pulse charge quantity is input into eddy current-temperature joint compensation module, in combination with gun body surface magnetic field intensity data and battery temperature data, output correction charge quantity;The correction charge quantity is input into nonlinear capacity mapping model, calculate effective charge total amount, according to battery aging coefficient is converted into final residual power and drives display unit.The present application introduces the dynamic variable sampling mechanism triggered by pulse rising edge, significantly improves the collection accuracy and timing response capability of high-speed pulse current, solves the problem of large integral error of traditional fixed-frequency sampling in strong dynamic scene, cooperates with edge compensation algorithm, can effectively restore the charge omission caused by trigger delay.

The invention discloses a porous composite membrane as well as a preparation method and application thereof. The porous composite membrane comprises an ion conduction layer and a high-strength layer; the thickness of the ion conduction layer is 30-70 [mu] m; the thickness of the high-strength layer is 4-15 microns; and the thickness of the porous composite membrane is 34-85 [mu] m. And the high-strength layer can further screen protons and metal ions, so that the coulombic efficiency of the battery is further improved. The membrane has excellent chemical stability, and provides a new direction for the design of a high-performance membrane of a flow battery. The preparation method is simple and easy to implement, and mass production is easy to realize. And the high-strength layer is not easy to fall off and has excellent mechanical properties.

The invention relates to the technical field of batteries, particularly provides a battery charging capability evaluation method, a rapid charging method, equipment and a medium, and aims to solve the technical problem of low safety and stability of an existing method. In order to achieve the purpose, the battery charging capability evaluation method comprises the steps of obtaining a preset charging interval; carrying out charging capability calibration at a preset rate in a preset charging interval, and obtaining target coulombic efficiency under the preset rate; and evaluating the charging capability of the battery based on the target coulombic efficiency. Therefore, charging capacity calibration is performed at the preset multiplying power in the preset charging interval, so that more accurate target coulombic efficiency can be obtained, and the charging capacity of the battery can be accurately evaluated. And the charging rate is optimized based on the evaluation result of the target coulombic efficiency, so that the fast charging performance of the battery can be improved, the charging time is shortened, and the use experience of a user is improved.