178 results about "Coulomb" patented technology

The invention provides a negative electrode material and a preparation method thereof. The negative electrode material comprises an inner core and a coating layer coating the surface of the inner core, the inner core comprises a porous carbon matrix and amorphous nano silicon particles dispersed in the porous carbon matrix; pores in the porous carbon matrix comprise micropores, the pore diameter of the micropores is less than 2nm, and the quantity of the micropores accounts for more than or equal to 80% of the total quantity of the pores. According to the negative electrode material, a silicon-carbon material core is coated with a coating layer, and the number of micropores in a porous carbon matrix is adjusted, so that on one hand, direct contact reaction between high-activity nano silicon and an electrolyte is effectively avoided; and on the other hand, the particle size of the amorphous nano silicon particles in the negative electrode material is relatively small, the dispersity in the porous carbon matrix is relatively good, and the negative electrode material has relatively low expansion rate and relatively high initial coulombic efficiency, rate capability and cycle performance.

The invention provides a solid electrolyte and a preparation method and application thereof, the solid electrolyte comprises a solid electrolyte matrix and a coating layer existing on the surface of the solid electrolyte matrix, and the coating layer comprises an inorganic substance with a sublimation temperature less than 500 DEG C; the coating rate of the solid electrolyte is greater than or equal to 90%. According to the solid electrolyte provided by the invention, the coating layer is introduced to the surface of the solid electrolyte matrix, the inorganic matter with the sublimation temperature less than 500 DEG C is used as the coating material, and the coating rate is greater than or equal to 90%, so that the interface impedance between the solid electrolyte and the electrode material can be reduced, and the microdefects and pores on the surface of the solid electrolyte matrix can be filled up; meanwhile, the solid electrolyte matrix can be prevented from being directly exposed in the environment, chemical bonds can be formed between the solid electrolyte matrix and some metal elements in the solid electrolyte matrix, and therefore the ionic conductivity retention rate and stability of the solid electrolyte can be improved, and the specific capacity and the first coulombic efficiency of a battery can be improved when the solid electrolyte is applied to the battery.

A multi-beam particle beam system 1 with improved resolution and higher acquisition speed is revealed. For this purpose, an electrostatic booster lens 112 is arranged in an upper focal plane of the objective lens 102 at the level of the crossing region of the primary particle beams. The electrostatic booster lens 112 selectively increases the kinetic energy of the primary beams 3 significantly in the crossing region 108, thereby reducing the Coulomb interaction between the charged particles.

The invention discloses a modified composite sulfide solid electrolyte as well as a preparation method and application thereof. The chemical composition of the modified composite sulfide solid electrolyte is xLi < 7-a > PS < 6-a > X . YLi < 7-b-c + dPbM < 1-b > S < 6-c-dOcId, X is at least one of Br, Cl or F, a is more than or equal to 0 and less than or equal to 2, b is more than or equal to 0 and less than 1, c is more than or equal to 0 and less than or equal to 2, d is more than or equal to 1 and less than or equal to 2, x is more than 0 and less than or equal to 1, y is more than 0 and less than or equal to 1, and x + y is equal to 1. The sulfide solid electrolyte is subjected to doping modification through a halogen-rich strategy and a soft acid and hard alkali theory, F / Cl / Br-rich and Sn-O-rich double doping is performed on the argyrodite type sulfide electrolyte, the argyrodite type sulfide electrolyte with the same structure is obtained, and the argyrodite type sulfide electrolyte has high ionic conductivity and low activation energy. The sulfide solid electrolyte disclosed by the invention is applied to a solid-state battery and has relatively high initial coulombic efficiency, capacity and cycle performance.

The invention relates to a multi-beam particle beam system (1) having a better resolution and a faster recording speed. To this end, an electrostatic booster lens (112) is arranged in an upper focal plane of the objective lens (102) level with the crossover region of the primary particle beams. The electrostatic booster lens (112) is used to significantly increase the kinetic energy of the primary beams (3) in the crossover region (108) in a targeted manner, which is why the Coulomb interaction between the charged particles is reduced.

The invention provides a hard carbon material and a preparation method thereof, a negative plate and a battery, the hard carbon material comprises a carbon inner core and a carbon shell located on at least a part of the surface of the carbon inner core, the carbon inner core is doped with oxygen anions, the oxygen anions comprise heteroatoms, and the heteroatoms comprise heteroatoms. The concentration of the heteroatoms is gradually reduced from the center of the carbon core to the direction close to the carbon shell, the specific surface area of the hard carbon material is B, and B is more than or equal to 5m < 2 > / g and less than or equal to 15m < 2 > / g. The hard carbon material provided by the invention has the unique core-shell structure and proper specific surface area, so that the reversible specific capacity and the first coulombic efficiency of the battery can be remarkably improved.

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 specifically discloses a power battery pack multi-parameter inconsistency detection method based on incremental capacity analysis, and relates to the technical field of battery detection. The method comprises the following steps: S1, carrying out short-time pulse constant-current discharge on a power battery pack parallel module comprising n battery cells, and recording terminal voltage change data of the battery pack parallel module in a test step; s2, calculating the total charge change of the battery pack parallel modules in the test step by using a coulomb counting method; s3, calculating the instantaneous rate of the capacity of the battery pack parallel module along with the change of the terminal voltage in the test step by using an incremental capacity analysis method; s4, extracting a statistical feature vector of the capacity change rate by adopting a statistical analysis method; s5, analyzing the statistical feature vector by adopting a statistical learning method; and S6, performing multi-parameter consistency diagnosis by using a machine learning method. The method solves the problems that an existing lithium battery pack parameter consistency detection method is long in detection time and high in cost.

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.

A circuit may include a two-stage feedforward compensated operational transconductance integrated amplifier, and the two-stage feedforward compensated operational transconductance integrated amplifier may include an input terminal, an output terminal, a signal path between the input terminal and the output terminal, the signal path comprising a first signal path gain stage and a second signal path gain stage, and ripple rejection circuitry coupled between the input terminal and an intermediate node of the signal path located between the first signal path gain stage and the second signal path gain stage. The ripple rejection circuitry may include a first ripple rejection circuitry gain stage coupled at its input to the input terminal and coupled at its output to an input terminal of a chopper circuit, a notch filter coupled at its input to an output terminal of the chopper circuit, and a second ripple rejection circuitry gain stage coupled at its input to an output terminal of the notch filter and coupled at its output to the intermediate node.

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 present disclosure is based on the implementation of a coulomb counting method using timestamped current measurement data to calculate the equivalent SOC, and then to calculate the variation in the equivalent SOC over a time interval, wherein this variation corresponds to the current delivered during that time period. The latter is then compared with one or more thresholds in order to qualify this variation as normal, or as abnormally slow ("SOC freeze") or fast ("SOC jump").

The present invention belongs to the technical field of sodium ion batteries, and discloses an iron-based Prussian blue positive electrode material and a preparation method and application thereof. The preparation method comprises the following steps: mixing ferrous salt, acid and water to obtain a first solution; mixing a cyanide source, a sodium supplement and water to obtain a second solution; mixing a water scavenger and water to obtain a third solution; mixing the first solution, the second solution and the third solution, and aging to obtain an iron-based Prussian blue positive electrode material. The iron-based Prussian blue positive electrode material prepared by the method of the present invention has a high specific capacity, a high coulomb efficiency and a high capacity retention rate at a high rate, and exhibits good rate performance and cycle performance when used as a positive electrode material for a sodium ion battery, providing a broad application prospect for low-cost, high-performance sodium ion batteries in the field of large-scale energy storage.

To allow easy removal of the medium to be printed remaining inside a printing device after deviating from a conveying path.SOLUTION: A printing device 1 comprises a pair of discharge rollers 10, 11 that feed a medium 20 to be printed toward a discharge port 301 at a discharge roller position in a conveying path of the medium 20 to be printed, and an electrification processing unit that electrifies at least one of the medium 20 to be printed and the discharge roller 11, which is one of the pair of discharge rollers 10, 11 to induce a Coulomb force in a direction of attraction between the medium 20 to be printed and one of the discharge rollers 11. The medium to be printed (medium piece T) that has deviated from the conveying path is adsorbed to one of the discharge rollers 11 by the Coulomb force and discharged to the outside of the device by the rotation of the pair of discharge rollers 10, 11.SELECTED DRAWING: Figure 8

The present invention discloses a bad block detection method, device and storage medium based on a coulomb counter, the method comprising: in the process of detecting a non-volatile memory, recording the electric energy consumed by each operation through the coulomb counter chip; judging whether the electric energy consumed by each operation is within a preset range; marking blocks whose electric energy consumed by one or more operations is not within the preset range as bad blocks. Thus, by recording the electric energy consumed by each operation through the coulomb counter chip, marking bad blocks with abnormal electric energy as bad blocks, the bad blocks of the non-volatile memory can be accurately discovered early, avoiding operations on risky areas, and greatly improving the service life of the non-volatile memory.

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.

Systems and methods of reducing the Coulomb interaction effects in a charged particle beam apparatus are disclosed. The charged particle beam apparatus may comprise a charged particle source and a source conversion unit comprising an aperture-lens forming electrode plate configured to be at a first voltage, an aperture lens plate configured to be at a second voltage that is different from the first voltage for generating a first electric field, which enables the aperture-lens forming electrode plate and the aperture lens plate to form aperture lenses of an aperture lens array to respectively focus a plurality of beamlets of the charged particle beam, and an imaging lens configured to focus the plurality of beamlets on an image plane. The charged particle beam apparatus may comprise an objective lens configured to focus the plurality of beamlets onto a surface of the sample and form a plurality of probe spots thereon.

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 invention relates to a method for enhancing the hydrogen evolution reaction efficiency of a semiconductor photocatalyst through an electric field, belongs to the technical field of photochemistry, and particularly relates to a photochemical analysis technology. Aiming at the urgent need of studying the regulation effect of an electric field on photocatalytic HER, the uniform and parallel electric field perpendicular to the electrode plate is formed by applying the bias voltage, separation of photo-generated carriers of catalyst particles is promoted under the action of Coulomb force, the photocatalytic reaction efficiency is improved, and good practical application value is achieved.

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 discloses a phosphorus-containing compound and a preparation method and application thereof, the structural general formula is as follows: # imgabs0 #, the compound can increase the concentration of ions in an electrolyte, lithium ions, sodium ions, potassium ions and the like in the electrolyte can enhance the conductivity of the electrolyte, and after the additive is added, the conductivity of the electrolyte can be improved. According to the present invention, the large internal resistance of the battery during the high-voltage charge-discharge process can be inhibited, and the stability of the electrode material can be improved, such that the high initial coulombic efficiency and the good cycle performance of the secondary battery under the high voltage can be achieved. The electrolyte additive provided by the invention has a remarkable improvement effect on the first coulombic efficiency and cycle performance of various secondary battery systems under high voltage.

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.