334 results about "High current density" patented technology

The invention relates to the field of durability testing of anion-exchange membrane electrolytic cells, in particular to a durability testing method of an anion-exchange membrane electrolytic cell. The durability testing method for the anion exchange membrane electrolytic cell comprises the following testing steps: S1, assembling the electrolytic cell; s2, activation and initial testing; s3, accelerated durability test: (a) running for 100 hours under the rated current density; (b) running for 100 hours at high current density; (c) periodically and alternately operating for 100 hours at the rated current density and the high current density; and S4, evaluating after testing. According to the application, load fluctuation in practical application is simulated through dynamic working conditions, and a degradation process similar to long-term steady-state operation can be induced within 300 hours in combination with a high-current-density acceleration condition. According to the method, the period of several months or even one year required by a traditional steady state test is shortened to several weeks through scientific design of a test process, and meanwhile, the consistency of a test result and an actual working condition is ensured.

The invention discloses an artificial SEI material and a preparation method thereof, an artificial SEI film and an artificial SEI film modified negative electrode. The artificial SEI material is an organic polymer brush (CNF-g-PSSX) prepared by grafting cellulose nanofibers with polystyrene sulfonate. The polymer brush is of a crystal structure and has a firm framework; and the side chain of polystyrene sulfonate has rich-SO3 functional groups which are matched with cations in sulfonate, so that a rapid ion transmission channel is provided, high-current-density circulation can be realized, and good interface contact is ensured. Due to a special molecular topological structure and a multi-component synergistic effect, when the organic polymer brush forms an artificial SEI film, high mechanical strength, high ionic conductivity and low interface impedance can be obtained at the same time, and through strong electrostatic repulsion between a negatively charged-SO3 group and the surface of a negatively charged lithium dendrite tip, the electrochemical performance of the artificial SEI film is improved. An obvious inhibition effect is shown on the continuous growth of dendritic crystals.

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

The invention discloses a method for constructing a foamed nickel hydrogen evolution electrode with a multi-layer gradient structure based on two-step electrodeposition. According to the method, the in-situ growth of a multilayer gradient structure catalyst layer is realized by regulating and controlling the current density, and the core process comprises the following steps: 1, pretreatment of an electrode substrate: carrying out ultrasonic cleaning on foamed nickel through hydrochloric acid, absolute ethyl alcohol and deionized water in sequence, and removing surface impurities; 2, step-by-step electro-deposition of the gradient catalyst layer: firstly, electro-deposition is carried out under low current density to form a uniform and compact transition catalyst layer, the contact area between the catalyst layer and the base material is increased, and the durability and stability of the catalyst layer are improved; and then switching to high current density for bubble template method electrodeposition, spontaneously forming a catalyst layer with an inverted cone-shaped hole array structure by utilizing the dynamic template effect of violent hydrogen evolution bubbles, and promoting rapid removal of the bubbles by utilizing the hole array. The electrode prepared by the method has excellent stability, bubble removal capability and catalytic activity in hydrogen evolution reaction.

The invention provides an MOSFET and a manufacturing method thereof. The MOSFET includes a substrate; the epitaxial layer is arranged on the substrate; the trench gate group comprises a first trench gate and a plurality of second trench gates, the first trench gate extends into the epitaxial layer from the surface of the side, away from the substrate, of the epitaxial layer, the first trench gate extends in the first direction on the plane where the epitaxial layer is located, and the second trench gates are arranged at intervals in the first direction; the orthographic projection of the second trench gate on the substrate is located in the orthographic projection range of the first trench gate on the substrate, the top of the second trench gate is in contact with the bottom of the first trench gate, and a gate layer in the second trench gate is connected with a gate layer in the first trench gate; each shielding region wraps the bottom and all the side walls of the second trench gate and extends towards the surface of the side, away from the substrate, of the epitaxial layer so as to cover the side wall of the first trench gate, and the multiple shielding regions are arranged at intervals. The shielding region has a three-dimensional structure, so that the stress of a trench gate oxide electric field can be reduced, the cell size of the MOSFET can be reduced, and the current density of the MOSFET can be improved.

A planar filament for an x-ray tube can have a different cross-sectional area at different locations. In regions of smaller cross-sectional area, there can be higher current density, and thus increased heating and higher temperature of the wire. In regions of larger cross-sectional area, there can be lower current density, and thus decreased heating of the wire. Regions of larger cross-sectional area can also be stronger, thus reducing early filament failures. Wider regions can have increased area for electron emission. By adjusting the cross-sectional area and width of the wire at different locations, electron emission can be largely confined to a center of the filament, and filament life can increase.

The invention provides a surface treatment agent, a surface treatment method of a copper foil and a copper foil negative electrode current collector, and belongs to the technical field of energy materials. The copper salt is used as a copper source, the N-alkyl pyridine halogen salt ionic liquid is used as a halogen source, the copper salt and the N-alkyl pyridine halogen salt ionic liquid react in the solution to form cuprous halide particles on the surface of the copper foil in situ, the specific surface area and the roughness of the surface of the copper foil negative electrode current collector are increased, the copper foil negative electrode current collector is firmly combined with an active substance, and therefore the specific capacity and the rate of the lithium ion battery are improved; cu < + > in the cuprous halide particles formed on the surface of the copper foil also participates in electrochemical reaction, so that the specific capacity of the lithium ion battery is further improved. The result of the embodiment shows that the capacity of the lithium ion battery prepared from the copper foil negative current collector obtained by carrying out surface treatment on the copper foil by the surface treating agent provided by the invention can reach 825mAh g <-1 >; 100 times of charge-discharge cycles are carried out under the large current density of 1Ag <-1 >, and the retention rate can reach 95%.

The invention belongs to the field of batteries, and provides a high-current-density long-circulation zinc-bromine flow battery negative electrode electrolyte and battery preparation. The battery comprises a positive electrode, a negative electrode, a diaphragm, positive and negative electrolyte, a current collector and an end plate, the diaphragm is a cation exchange membrane; and the negative electrode electrolyte comprises a metal salt, a supporting electrolyte, an organic carboxylate complexing agent and deionized water. The organic carboxylate complexing agent disclosed by the invention can be adsorbed on a porous electrode, and by increasing zinc deposition sites, inhibiting two-dimensional interface diffusion and promoting zinc mass transfer, zinc dendrites are relieved, and the zinc-bromine flow battery with high current density and long circulation stability is realized.

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

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

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

The invention relates to a preparation method of an electrode, the electrode and a metal-based flow battery. The preparation method of the electrode comprises the following steps: S100, cleaning and drying a carbon felt; s200, preparing an MXene colloidal solution; and S300, loading the MXene colloid on the surface of the carbon felt in situ by adopting an electrochemical deposition method to form the MXene-coated CF composite electrode. Through the arrangement, the high-zinc-ion-concentration IHP layer is constructed on the negative electrode of the battery by using MXene to inhibit dendritic crystal formation and reduce polarization loss, and the high-current-density performance and cycling stability of the zinc-bromine flow battery are improved.

According to the aqueous electrolyte, the preparation method and the aqueous metal ion battery provided by the invention, the zinc salt, the deionized water and the additive are mixed to obtain the electrolyte, and the additive comprises the carbamido-containing organic molecules, so that a double-electric-layer structure on the surface of zinc metal can be changed, an energy barrier in a stripping process can be reduced, and a zinc metal negative electrode can be regulated and controlled to be stripped uniformly; the battery is promoted to show stable cycle performance under high current and high capacity; meanwhile, the electrolyte containing the carbamido organic molecule additive optimizes the surface state of the zinc metal negative electrode and ensures the advantages of high ionic conductivity, low cost and environmental protection of the pure water system electrolyte; besides, the aqueous electrolyte provided by the invention can be applied to the rechargeable aqueous zinc ion battery, realizes long cycle life under high current density and deposition capacity, and has wide application prospects.

The invention discloses a rare earth metal electrolytic reduction method based on a high-frequency switching power supply, and relates to the technical field of rare earth metal electrolytic reduction, and the method comprises the following steps: firstly, in a praseodymium-neodymium electro-deposition process, parameter data in the praseodymium-neodymium electro-deposition process is accurately obtained in real time by using an advanced sensor and detection equipment; and accurate, comprehensive and real-time data support is provided for subsequent intelligent analysis. According to the invention, the problems of stress accumulation, crack propagation and coating stripping caused by fixed preset intermittent closing time in high-current density electrodeposition are solved. Intelligent optimization is realized through real-time data acquisition, deep learning evaluation and dynamic pulse current regulation and control. And when the stress rise is detected, the system adaptively prolongs the intermittent closing time, and reduces the pulse peak current, so that the deposition rate is optimized, and the uniformity and compactness of a plating layer are improved. The method improves the mechanical strength and corrosion resistance of the coating, prolongs the service life of equipment, reduces the energy consumption, and improves the process stability and consistency.

The invention relates to an activated carbon electrode material for a supercapacitor and a preparation process thereof, and belongs to the technical field of activated carbon electrode materials. The preparation process provided by the invention specifically comprises the following steps: mixing cane sugar, ammonium dihydrogen phosphate, deionized water and zinc gluconate, carrying out spray drying at 80 DEG C to obtain precursor powder with a loose structure, carbonizing, then carrying out pulse activation, water vapor reaming, cooling and post-treatment, mixing the obtained composite material with carbon nanofibers, a PTFE binder and absolute ethyl alcohol, and carrying out ball milling, so as to obtain the carbon nanofiber composite material. And coating the obtained slurry with an aluminum foil, drying, rolling, and carrying out hot press molding, thereby obtaining the product. According to the invention, cane sugar is used as a carbon source, zinc gluconate is introduced to assist in forming a honeycomb-shaped pore frame, and a honeycomb-shaped porous structure is formed along with further increase of carbonization temperature and multiple cyclic pulse activation and water vapor chambering processes, so that the ion transmission efficiency is improved, and the loss of a specific capacitance value under high current density is reduced; the capacitance performance of the material is improved.

The invention discloses an insulated gate bipolar transistor device and a preparation process thereof, and the device comprises a substrate, a drain electrode which is formed below the substrate, a dielectric layer which is formed above the substrate, a source electrode which is formed above the dielectric layer, and a plurality of grooves which are formed in the substrate in a downward etching and sinking manner and are independently arranged, independent trench gates are deposited in the trenches, the cross section of the plurality of trenches is of a circular or annular or polygonal closed structure, and the trench gates are insulated and isolated from the side walls of the trenches and the source electrodes through dielectric layers. The novel groove type IGBT structure is achieved through the groove gates arranged in a circular layout mode, the structure has the advantages of being high in channel density, large in current density, simple in process and the like, and the chip area and the cost can be reduced while the current capacity is kept; or the current density and the power density of the device are improved while the chip area is maintained, and the on-state loss is reduced.

The invention relates to the technical field of copper material processing and manufacturing, in particular to a graphene copper composite material for transmission under high current density and a preparation method thereof.The method comprises the steps that cold isostatic pressing treatment is conducted on copper powder for in-situ growth of graphene, and a compressed blank is obtained; sintering the compressed blank to obtain a sintered blank; carrying out extrusion treatment on the sintered blank to obtain an extruded blank; the extrusion blank is subjected to a drawing process and annealing treatment, and the graphene copper composite material is obtained; the temperature rise of the obtained graphene copper composite material is at least 10% lower than that of oxygen-free copper under the large current density, the high-temperature conductivity is 3%-7% higher than that of TU0 oxygen-free copper, the temperature coefficient of resistance (TCR) is at least 3%-11% lower than that of pure copper, the heat conductivity coefficient reaches at least 440 W / (m.K), the conductivity is at least 105% IACS, the tensile strength is larger than or equal to 350 MPa, and the softening temperature is larger than or equal to 300 DEG C.

The invention provides a phosphorus-doped CoFe-LDH electrode for high-current hydrogen production as well as a preparation method and application thereof. The preparation method comprises the following steps: mixing foamed nickel subjected to acid pickling treatment with a red phosphorus solution, and carrying out hydrothermal reaction to obtain NiP; the preparation method comprises the following steps: immersing NiP into a mixed solution of cobalt acetate tetrahydrate and 2-methylimidazole to obtain Co-ZIF-L-coated NiP; and the Co-ZIF-L (at) NiP is immersed in a ferrous sulfate tetrahydrate solution, and the CoFe-LDH (at) NiP-120 electrode is obtained through heating. An anion exchange membrane water electrolysis device (AEM) based on the electrode shows remarkable activity when the voltage is 1.85 V, the current density reaches 100 mA cm <-2 >, and obvious performance degradation does not occur when the AEM stably operates for 70 h under the large current density of 100 mA cm <-2 >. Compared with an existing electrolyzed water electrode, the method has the characteristics that active sites are accurately regulated and controlled, the structural stability is improved, and the process cost is reduced.

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

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

The present invention relates to the technical field of electrochemical energy materials, and specifically discloses a molybdenum nitride / nickel cobalt nitride nanosheet heterostructure electrocatalytic material, its preparation method and application. The method comprises S1, preparing copper hydroxide nanowires loaded on copper foam; S2, preparing copper nanowires loaded on copper foam; S3, preparing copper nanowire-loaded molybdenum-doped nickel cobalt nanosheets; S4, placing the copper nanowire-loaded molybdenum-doped nickel cobalt nanosheets in a tube furnace, and nitriding them in an ammonia nitrogen atmosphere to obtain a molybdenum nitride / nickel cobalt nitride nanosheet heterostructure electrocatalytic material. The internal resistance of the material is reduced by electron transfer and heterostructure between molybdenum nitride and nickel cobalt nitride, and compared with precious metal platinum wire, the material has excellent high current density hydrogen evolution performance. The preparation method provided by the present invention has the advantages of simple synthesis process, short synthesis cycle and low production cost. In addition, no hydrothermal reaction is required during preparation, the material has high safety and reliable repeatability, and is very suitable for large-scale industrial production.

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

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

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

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

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

A carbon nanotube electrode material with a Y-shaped branch structure has an average diameter of 60nm, the carbon nanotube electrode material is of the Y-shaped branch structure, continuous bamboo-like capsule structure channels are formed in a carbon nanotube, and the carbon nanotube is prepared by dissolving an imidazole aqueous solution, a urea aqueous solution and a ferrocene aqueous solution in an acetonitrile aqueous solution to prepare a precursor solution; the precursor solution is heated and converted into boil-off gas, the precursor solution boil-off gas is conveyed to the surface of a heated silicon wafer through mixed gas of H2 and NH3 for growth, and washing and drying are conducted after growth is finished. The unique structure of the prepared Y-type branched carbon nanotube material can be used as a sodium ion storage space, the branched structure is beneficial to rapid transmission of ions and charges, when the Y-type branched carbon nanotube material is used as a sodium ion battery positive electrode material, the reversible capacity is 416 mAh g <-1 > when the current density is 100 mAh g <-1 >, and the Y-type branched carbon nanotube material has excellent rate capacity of 257 mAh g <-1 > when the current density is 2 A g <-1 >. And the reversible charge-discharge cycle number exceeds 4500.

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

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

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