78 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 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.

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.

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 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 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 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.

A negative electrode material, a negative electrode sheet, and a secondary battery, the negative electrode material including a core and a coating layer provided on at least part of a surface of the core, the coating layer including a polymer, an infrared spectrum of the negative electrode material including a first characteristic peak, a second characteristic peak, and a third characteristic peak in a wave number range of 1320±10 cm ‑1 to 1880±10 cm ‑1 , the first characteristic peak being a bending vibration peak of a -CH2 bond, the second characteristic peak being a stretching vibration peak of a C-N bond, and the third characteristic peak being a stretching vibration peak of a C=C bond, a ratio of peak areas of the first characteristic peak and the third characteristic peak being Z, Z being 0.35 to 0.8. The negative electrode sheet and the secondary battery include the negative electrode material, and the secondary battery has a high initial coulomb efficiency.

The invention discloses a method for improving the electrical transport characteristic of etched graphene quantum dots and a device structure, and belongs to the technical field of low-temperature transport testing. The method comprises the following steps: manufacturing an etched graphene quantum dot device; carrying out preliminary electric transportation characterization by cooling; through several times of circular processing of sample electrode grounding protection-heating to more than 200K or room temperature-re-cooling-electrical transport characterization, the electrical transport property of the device is improved, and subsequent quantum dot fine charge stability diagram observation and control can be carried out. According to the optimization method, the coulomb blocking interval of the graphene quantum dots is successfully and gradually adjusted to the zero point from hundred volts through multiple times of temperature rising and falling thermal cycle treatment, grid voltage is conveniently applied, the double-quantum-dot charge stability diagram is obviously optimized and improved, and the yield of etched graphene quantum dot devices is greatly improved. In addition, the optimization method is easy to operate, obvious in effect and suitable for popularization.

The present invention relates to a battery state-of-charge estimation device, comprising: a first coulomb counter that accumulates a battery current Im for each predetermined period and calculates a first charge change amount [Delta] Q for each period; a second coulomb counter that accumulates the first charge change amount [Delta] Q to calculate a first predicted charge amount Qe; a compensator that calculates a second charge change amount [Delta] Qcomp by compensating the first charge change amount [Delta] Q using the first predicted charge amount Qm and the second predicted charge amount Qe; a third coulomb counter that accumulates the second charge change amount [Delta] Qcomp to calculate a second predicted charge amount Qe; and a state-of-charge estimator that estimates the state of charge of the battery on the basis of the second predicted charge amount Qe. According to the present invention, in battery state-of-charge estimation based on a coulomb counter, a state-of-charge estimation error caused by error accumulation of current detection can be reduced, and characteristics caused by battery temperature and aging can be compensated to improve the accuracy of state-of-charge estimation.

The invention relates to the technical field of batteries, in particular to a positive electrode lithium supplementing material and a preparation method and application thereof, the positive electrode lithium supplementing material is Li2Ni1-xMxO2, M is selected from Zn and / or Cu, and 0.01 * 0.1. The electronic structure of Li2NiO2 is regulated and controlled through heteroatom doping, a charge transfer item delta is reduced, a coulomb action item U is increased, the energy level of a non-bond O < 2 > p is close to the Fermi energy level, the oxidation activity of lattice oxygen is effectively excited, and the core problems that a traditional Li2NiO2 lithium supplementing material is low in lithium removal efficiency and insufficient in irreversible capacity are solved; and the preparation process is simple, the repeatability is high, and large-scale popularization is easy.

The present application provides a secondary battery. The secondary battery comprises a negative pole piece, the negative pole piece comprises a negative current collector and a coating located on at least one side of the negative current collector, the coating comprises a carbon-based material, and the carbon-based material has the graphitization degree of at least 80%. The secondary battery of the present application has coulombic efficiency.

This invention relates to a method for improving the transconductance and characteristic frequency of AlGaN / GaN heterojunction field-effect transistors based on device structure optimization, belonging to the field of transistor device research technology. Traditional methods for improving transconductance and characteristic frequency are complex in fabrication, require stringent experimental conditions, and have reached the physical limits of GaN materials. This invention, to a certain extent, only requires optimizing the device structure and fabricating the L… GS / L G and L GD / L G AlGaN / GaN HFETs with larger ratios, and the fabrication of L G Smaller AlGaN / GaN HFETs enhance polarized Coulomb field scattering, thereby improving the gate voltage's ability to modulate electron velocity, or fabricate L... GS and L G Smaller AlGaN / GaN HFETs enhance the electron velocity in the channel, thus achieving the same effect of increasing the transconductance and characteristic frequency of AlGaN / GaN HFETs. They are simple, direct, and highly operable.

A kind of negative material, negative pole piece and secondary battery, negative material includes core and the cladding layer of at least part surface of core, core includes matrix and active material, at least part active material is arranged in the inside of matrix;The atomic percentage content of oxygen element of negative material surface is A1%, the atomic percentage content of oxygen element at the depth of 20 nm from the surface of negative material is A2%, the atomic percentage content of oxygen element at the depth of 160 nm from the surface of negative material is A3%, A1 is greater than A2, 2≤A3≤10.The negative pole piece or secondary battery of application above-mentioned negative material has higher reversible specific capacity, first coulomb efficiency and good cycle stability.

The invention discloses a low-temperature-resistant organic electrolyte for a supercapacitor as well as a preparation method and application of the low-temperature-resistant organic electrolyte. The electrolyte is composed of an electrolyte salt, a main solvent and a co-solvent, the final concentration of the electrolyte salt is 1-2 mol / L, the main solvent and the co-solvent respectively have low viscosity and high dielectric constant, the coulomb acting force between anions and cations of the electrolyte salt is weakened through the synergistic effect, the conductivity of the electrolyte is improved, and the ion transport energy barrier is reduced; therefore, the phenomenon that the specific capacitance of the supercapacitor is rapidly attenuated along with temperature reduction is relieved, and the applicable temperature range is expanded. Based on the electrolyte, the symmetric supercapacitor assembled by the activated carbon can be normally charged and discharged at the temperature of-60 DEG C, the specific capacitance at the temperature of-60 DEG C can reach 20F / g, and the electrolyte has a good application prospect.

The application discloses a kind of quantitative methods of magnetic flux leakage signal characteristics, including based on the step of establishing subarea magnetic charge distribution density model, the step of establishing subarea magnetic charge received coulomb force model and the step of establishing the magnetic charge amount equation group of defect area, obtain the magnetic charge amount equation group of defect area, in the step of establishing magnetic charge density model, obtain the magnetic charge density model of defect area first sidewall, based on the step of establishing improved effective field model to obtain improved effective field model, and in the step of establishing the relationship model between improved magnetization intensity and stress to obtain the relationship model between improved magnetization intensity and stress, again based on improved magnetic charge density model to obtain composite magnetic charge analytical model, again through experimental verification step, improved magnetic charge density model and composite magnetic charge analytical model are verified.The non-uniform distribution of magnetic charge and stress of stress concentration area are introduced into composite magnetic charge analytical model in the application, so that the calculation and measurement result of magnetic flux leakage signal characteristics is more accurate.

The application provides a positive electrode material and a preparation method thereof, and a sodium ion battery, so as to improve the initial coulomb efficiency of O3 phase sodium ion positive electrode material, and provide a sodium ion positive electrode material with high specific capacity and high initial coulomb efficiency. The positive electrode material comprises: a coating layer and an inner layer material coated by the coating layer, the coating layer is yCuO, and the inner layer material is Na x Ni a Fe b Mn c Cu d M e O 2‑β P β ;0