291results about How to "Lower impedance" patented technology

The invention discloses an ultra-wideband low-profile dual-polarization curved surface phased-array antenna, and belongs to the field of antenna engineering technology and wireless communication. The phased-array antenna comprises a plurality of pitching surface sub-arrays which are arranged along the axial direction; the pitching surface subarray is composed of a plurality of curved surface antenna units which are uniformly distributed along the circumference, and the whole pitching surface subarray is fan-shaped; the curved antenna unit comprises a curved dielectric block, a metasurface matching layer, a radiator layer, a vertical feed balun, a wave-absorbing resistance layer and a metal floor layer, wherein the metasurface matching layer and the radiator layer are conformally arranged on the upper surface and the lower surface of the curved dielectric block. According to the antenna, the flexible dielectric plate is used as a carrier of a radiation dipole and is matched with the PCB metal floor, so that the normal active standing-wave ratio of the antenna is smaller than 3.0 in ten octaves in two linear polarization directions of horizontal polarization and vertical polarization, and + / -60-degree scanning is realized in an azimuth plane.

The invention relates to the technical field of lithium ion battery materials, and provides a lithium iron phosphate positive electrode material, a preparation method thereof and a lithium battery. The preparation method of the lithium iron phosphate positive electrode material comprises the following steps: performing a first coprecipitation reaction on a first iron source solution and a first phosphorus source solution in the presence of a polymer monomer to obtain an iron phosphate seed crystal; performing a second coprecipitation reaction on the second iron source solution and the second phosphorus source solution in the presence of a polymer monomer and an iron phosphate seed crystal to obtain iron phosphate dihydrate; iron phosphate dihydrate, a lithium source and a carbon source are mixed and then subjected to spray drying, the mixture is placed in a rotary kiln to be sintered, carbon-coated lithium iron phosphate with the large particle size and carbon-coated lithium iron phosphate with the small particle size are prepared at different sintering temperatures respectively, and the carbon-coated lithium iron phosphate with the different particle sizes are mixed according to the mass ratio to obtain the lithium iron phosphate positive electrode material. The lithium iron phosphate positive electrode material has relatively good spherical morphology, so that the lithium iron phosphate positive electrode material has relatively high compaction density and electrical properties after grading.

The invention relates to the technical field of lithium batteries, and provides a lithium ion secondary battery. The battery comprises a positive plate, a diaphragm and a negative plate which are laminated, the positive plate comprises lithium iron phosphate; the diaphragm is formed by a base film; the battery also comprises an electrolyte; the electrolyte comprises lithium bis (fluorosulfonyl) imide and lithium hexafluorophosphate; based on the total mass of the electrolyte, the mass ratio of the lithium bis (fluorosulfonyl) imide is recorded as L2, and the mass ratio of the lithium hexafluorophosphate is recorded as L1; l2 and L1 satisfy the following conditions: 0.1 < = L2 / L1 < = 4.6; the electrolyte comprises a linear organic solvent and an annular organic solvent; the linear organic solvent comprises linear carbonic ester and linear carboxylic ester, and the cyclic organic solvent comprises cyclic carbonic ester; the mass ratio of the linear organic solvent to the annular organic solvent is marked as W, and W is greater than or equal to 1; when the conditions are met, the high and low temperature performance and the safety performance of the battery can be effectively improved.

The invention provides a method for cyclically regenerating a positive electrode active material by using magnesium sulfate, which comprises the following steps: 1) burdening and mixing waste lithium battery black powder, magnesium sulfate and a carbon source, and roasting the mixture in a vacuum or inert atmosphere to obtain a roasted product; (2) adding the roasted product into water to carry out water leaching treatment, and carrying out suction filtration to obtain a lithium sulfate solution and water leaching residues; 3) adding the lithium sulfate solution into the saturated sodium carbonate solution for lithium precipitation to obtain a lithium carbonate precipitate; (4) drying the water leaching residues, adding dilute sulphuric acid to carry out acid leaching treatment, filtering to obtain acid leaching residues and a magnesium sulfate solution, and then carrying out evaporative crystallization treatment on the magnesium sulfate solution to obtain a magnesium sulfate precipitate; 5) mixing the acid leaching residues with lithium carbonate, and sintering to obtain the regenerated ternary positive electrode active material.According to the method, the recovery rate of obtained lithium reaches 99% or above, loss of important elements in the regeneration process can be avoided, cyclic utilization of magnesium sulfate is achieved, and consumption of chemical reagents and secondary pollution are reduced.

The invention provides a negative pole piece, a preparation method thereof and a battery, the negative pole piece comprises a negative current collector and a negative active material layer, and the negative active material layer comprises a negative active material, a conductive agent and a binder; the negative pole piece meets the following relational expressions: 0.1 < = SV / SL < = 1.0, R / W < = 10%, 0.1% < = R < = 0.5%, 1.0% < = W < = 5.0%; wherein SL is the area of the active particles corresponding to the included angle theta between the orientation of the negative electrode active material and the negative electrode current collector being less than 45 degrees, and Sv is the area of the active particles corresponding to theta being greater than or equal to 45 degrees; r is the range of the distributed mass percentage content of the binder; w0 is the total mass percentage content of the binder; the distribution range R of the binder and the orientation SV / SL of the active particles are controlled through the novel manufacturing process, the phenomenon that the binder is not uniformly distributed in the solvent evaporation process can be reduced, the orientation degree of the active substance particles on the pole piece in the rolling process can be reduced, the battery impedance is reduced, and the battery performance is improved. The electrochemical performance of the battery is improved.

The invention relates to a water-based binder and a preparation method and application thereof, the water-based binder comprises modified polyvinyl alcohol, the modified polyvinyl alcohol has repetitive units shown as a formula (1) and a formula (2), # imgabs0 #, R1 is selected from one or more of-Ph and-Ph-(R3) n1, each R3 is the same or different, and n is a positive integer. The two groups are independently selected from one or more of halogen atoms and C1-C3 halogenated alkyl, and n1 is any integer between 1 and 5. The modified polyvinyl alcohol water-based binder disclosed by the invention has good dispersion performance on an electrode material and a conductive agent, keeps good compatibility with an electrolyte, and has the advantages of excellent cohesiveness and environment friendliness, so that the lithium ion battery further has excellent cycling stability and high rate performance, and the lithium ion battery has a wide application prospect. Therefore, the service life of the lithium battery is prolonged.

The invention discloses a carrier board with high integration level, which comprises at least two prefabricated printed circuit board laminations and at least one hollow area, the printed circuit board laminations are fixedly connected through an insulated bonding dielectric layer, and the hollow area is provided with at least one power supply circuit assembly. On the other hand, the invention discloses a high-integration-level transformer unit and a high-integration-level two-stage framework power supply device. The high-integration-level two-stage framework power supply device comprises an annular magnetic core and a winding, wherein the annular magnetic core is embedded in a carrier plate, and the winding is arranged in the carrier plate. On the other hand, the invention discloses a high-integration-level composite electronic component group which comprises at least two flat component groups which are fixedly connected through a bonding medium layer. The bonding medium layer does not need to play a supporting role, so that the thickness of the bonding medium layer can be far smaller than the thickness of a first lamination layer in a lamination mode, namely far smaller than 0.2 mm, space can be saved, and on the other hand, the lamination layer above the hollow area can be manufactured according to a conventional process, so that the process can be simplified.

The invention provides nitrogen-doped carbon-coated lithium manganese iron phosphate as well as a preparation method and application thereof, and relates to the technical field of lithium ion batteries. Specifically, a solution containing a phosphorus source, a lithium source, an iron source and a manganese source is mixed and ground to obtain a first material; a dispersing agent is added into the first material, mixing and grinding are conducted, a second material is obtained, and the dispersing agent comprises at least one of chitosan, polyvinylpyrrolidone or polyethyleneimine; and sequentially carrying out spray drying, sintering and crushing on the second material to obtain the lithium iron manganese phosphate positive electrode material. By adopting a specific type of organic dispersing agent and introducing through a specific technological process, grain agglomeration can be effectively avoided, and the conductivity and carbon coating stability of the lithium manganese iron phosphate material are improved, so that the electrochemical performance of the positive electrode material is effectively improved; meanwhile, the preparation method is simple and easy to implement, and has a prospect of batch application.

The invention discloses a lithium ion battery with a silicon-carbon negative electrode, belongs to the technical field of lithium ion batteries, and overcomes the defect of poor cycling stability of a lithium ion battery with a silicon-carbon composite material as a negative electrode in the prior art. According to the lithium ion battery with the silicon-carbon negative electrode, a negative electrode active material layer comprises a silicon-carbon composite material; the Raman spectrum characteristics of the silicon-carbon composite material meet the following conditions: (D1 + D3) / (D2 + D4) = K, wherein K is more than or equal to 0.5 and less than or equal to 3; d1, D2, D3 and D4 correspond to the intensities of the characteristic peak 1, the characteristic peak 2, the characteristic peak 3 and the characteristic peak 4 respectively; and the electrolyte comprises an additive A1. And the additive A1 interacts with the specific silicon-carbon material, so that the generation of an SEI film is promoted, and the ionic conductivity, the stability and the elasticity of the SEI film are improved, thereby improving the cycling stability and the safety of the silicon-carbon battery.

The invention discloses a packaging structure of a half-bridge power module. The packaging structure comprises an insulating heat-conducting plate, a multi-layer circuit board, a plastic packaging body and a bridge arm switch, on the other hand, the invention discloses application of the packaging structure of the half-bridge power module in a vehicle-mounted OBC power converter, a DCDC isolation converter, a non-isolation power converter, a cardiac arrest wake-up device and a circuit module formed by combining multiple half bridges such as ANPC, TNPC and Heric. The invention further discloses a manufacturing method of the packaging structure of the half-bridge power module. The manufacturing method comprises the steps of assembling, arranging the overflow area and synchronously filling and grinding to remove the overflow area. The minimum size and low impedance are achieved through the DBC, flexible pin outgoing and welding are achieved through the PCB, the reliability, safety and heat dissipation of the module are supported through the plastic package body, and the expansion temperature monitoring unit and the decoupling capacitor are supported.

The invention relates to a preparation method of a multilayer alloy net electrode for hydrogen production by alkaline electrolysis of water and the multilayer alloy net electrode, and the preparation method comprises the following steps: firstly, selecting an alloy electrode net material, then etching the alloy electrode net, and carrying out electrochemical etching by taking the alloy electrode net as an anode and an inert electrode as a cathode and using 0.5-5M acid liquor to prepare the multilayer alloy net electrode. The preparation method comprises the following steps: sequentially overlapping a first layer of pure nickel net with the mesh number of 80-200 and a second layer of etched alloy electrode net with the mesh number of 40-80 and a third layer of etched alloy electrode net with the mesh number of 20-40, carrying out vacuum sintering at 800-1400 DEG C for 2-5 hours, and finally stirring and drying in a polyethyleneimine aqueous solution. Compared with the prior art, the obtained electrode has the advantages of being low in cost, high in catalytic activity, fast in bubble removal, high in durability and stability and the like, effectively solves many problems of an existing alkaline water hydrogen production electrode, has a wide application prospect in the field of alkaline water electrolysis hydrogen production, can remarkably improve the water electrolysis efficiency and is beneficial to large-scale industrial production.

The invention discloses a multiplying power type electrolyte additive, electrolyte and a lithium ion battery, and belongs to the technical field of lithium ion, the multiplying power type electrolyte additive is a silane group dimethyl ether compound containing two symmetrical structures, and the general formula of the additive is # imgabs0 #; the lithium ion battery comprises a positive plate, a negative plate, an isolating membrane and the multiplying power type electrolyte. According to the invention, the dimethyl ether compound of the methoxy silane group with a symmetrical structure is used as an additive to be applied to the preparation of the lithium ion battery electrolyte. According to the present invention, the dimethyl ether compound containing the methoxy silane group with the symmetric structure is combined with the auxiliary additive so as to provide characteristics of low cell impedance, excellent battery charge-discharge and cycle performance, and high temperature performance of the cell in the high energy density battery system; the electrolyte is used for manufacturing the lithium ion battery, and the obtained battery has excellent charge-discharge performance.

The application discloses a kind of full solid-state battery and its preparation method and application, it is related to solid-state battery technical field.The edge of positive active layer is attached with solidified insulating glue, so as to use the solidified insulating glue to fill the size difference between the positive active layer and the negative active layer, and the end of the positive active layer and the negative active layer is flush, the insulating glue plays a supporting role under extrusion, avoids the problems such as collapse and short circuit caused by the size difference between the positive active layer and the negative active layer;The insulating glue at the edge can be bonded with the negative electrode under high pressure, and when the positive electrode is charged and discharged, the cycle performance difference caused by the volume change of the positive electrode during charging and discharging can be effectively alleviated, and the cycle of the battery is improved;It can also effectively avoid the occurrence of problems such as the edge of the positive electrode dropping material.By setting electrolyte film between the positive active layer and the negative active layer, the impedance between the electrolyte film and the electrode sheet is reduced by using the ionic liquid treatment layer on the electrolyte film, and the battery performance is improved.

In order to solve the problems of acidity increase and lithium salt consumption in the cycle process of an existing lithium ion battery, the invention provides a non-aqueous electrolyte and a lithium ion battery, the non-aqueous electrolyte comprises a non-aqueous organic solvent, a first lithium salt, a second lithium salt and a first additive, the first lithium salt is lithium hexafluorophosphate, and the second lithium salt is lithium hexafluorophosphate. The second lithium salt comprises at least one of lithium bis (fluorosulfonyl) imide and lithium bis (trifluoromethylsulfonyl) imide, the first additive comprises a compound shown in a structural formula 1: # imgabs0, and the non-aqueous electrolyte meets the following conditions: 45 < = sigma * (b + c) < = 220, 0.01 < = a / c < = 0.8, 0.001 < = a < = 1, 2 < = b < = 19, 1 < = c < = 10, and 6 < = sigma < = 13. The non-aqueous electrolyte provided by the invention can keep a low-acidity state after long-term circulation, and can effectively prolong the cycle life of a lithium ion battery when being applied to the lithium ion battery.

The invention belongs to the technical field of lithium ion batteries, and particularly relates to a lithium ion battery high-voltage electrolyte and a lithium ion battery. The high-voltage electrolyte comprises a lithium salt, a first additive, a second additive, an auxiliary additive and an organic solvent, the first additive is a sulfur-containing siloxy boric acid ester derivative, and the second additive is a benzofuran boric acid ester derivative. Borate groups and benzofuran groups in the first additive and the second additive can promote generation of CEI and SEI protective films on the surfaces of a positive electrode and a negative electrode, the stability of the material is enhanced, electrolyte decomposition is inhibited, and the high-voltage performance of the lithium battery is improved; the trimethylsiloxy group can remove HF in the system, can reduce the corrosion to the positive and negative electrode interface of the battery, and improves the cycle performance of the battery; boron and sulfur atoms in the additive can significantly reduce the internal resistance of the battery and improve the performance of the high-voltage battery at low temperature.

The invention relates to a charging circuit, a charging method, a charging device, a terminal and a storage medium, and relates to the field of terminals. The first charging module is connected with the power supply end through a first input branch, and the first input branch is provided with a first switch unit; and the second charging module is connected with the power supply end through a second input branch, and the second input branch is provided with a second switch unit. According to the invention, the first switch unit and the second switch unit are arranged in the charging circuit to control the on-off of the input branches of different charging modules of the charging circuit, and the first charging module selects to switch on the first switch unit or the second switch unit according to different output signals of the power supply end, so that when the voltage input by the power supply end is too high, the switching of the first switch unit or the second switch unit is realized. And the charging module which does not support high-voltage input can be cut off through the switch unit.

The invention provides a high-energy-density lithium iron phosphate positive electrode slurry and a preparation method and application thereof, and the method comprises the following steps: step doping, mixing and grinding a phosphorus source, a lithium source and an iron source, re-mixing the materials after spray drying and calcining, adding a coating agent, and sanding and calcining to form lithium iron phosphate powder doped with metal ions; adding the lithium iron phosphate powder doped with metal ions, a dispersing agent and a conductive binder into a stirring tank according to a ratio, stirring, dispersing and carrying out dry mixing; adding an organic solvent, stirring and dispersing, stopping the machine, scraping the paddle and the wall, and stirring and dispersing again; vacuumizing, reversing for defoaming, closing the dispersion speed, and stirring to obtain the dispersing agent. The addition amount of the lithium iron phosphate doped with the metal ions is 97%-99%; the addition amount of the conductive adhesive is 0.5%-2.5%; according to the invention, the non-fluorine binder is compounded with the conductive active component to solve the problems of peel strength and pole piece flexibility, and the peel strength of the material is greater than 150N / m under the condition that the addition amount of the binder is less than 1%.

The invention belongs to the technical field of composite electrode materials, and relates to a preparation method of a NiCoCu selenide composite MXene / carbon sphere thin film electrode material, which comprises the following steps: firstly, dissolving ZIF-67 powder in a carbon sphere solution, then adding an MXene aqueous solution, stirring for 1-10 hours, and carrying out suction filtration and drying to obtain ZIF-67 MXene / CS; secondly, a solution is prepared from urea, a copper source, a nickel source and ethyl alcohol according to the proportion, ZIF-67 (at) MXene / CS is immersed in the solution, and a NiCoCu-LDH (at) MXene / CS thin film is obtained after a hydrothermal reaction; and thirdly, mixing the NiCoCu-LDH-coated MXene / CS film, selenium powder and sodium borohydride according to a mass ratio of (0.5-1): (1-2): (1-2), reacting at 150-180 DEG C for 12-24 hours, washing the obtained product with deionized water, and drying to obtain the NiCoCu-LDH-coated MXene / CS composite material. The MXene and the carbon spheres jointly provide a flexible substrate for the self-supporting material, the conductivity and the specific surface area of the material are increased, meanwhile, NiCoCu-Se is intercalated into the MXene, an intermediate buffering effect is achieved, self-stacking of the MXene is prevented, and the structure of the self-supporting material is more stable. When the self-supporting material is applied to a positive electrode material of a supercapacitor, the self-supporting material avoids using an adhesive, so that the impedance of the material is reduced, and the electrochemical performance is improved.

The invention discloses an electrolyte for a high-voltage fast-charge alkali metal secondary battery and a battery thereof, the electrolyte comprises a main salt, a non-aqueous solvent and an additive, the main salt is selected from a main lithium salt or a main sodium salt, the additive at least comprises a first additive shown as a structural formula (I), the electrolyte also can comprise a sulfate compound as a second additive, a lithium / sodium salt additive as a third additive and other basic additives, and the specific structure is shown in the specification. Particularly, the electrolyte is stored for more than or equal to 12 hours at the temperature of-30 to 60 DEG C and then is injected. When the electrolyte is applied to the high-voltage fast-charge alkali metal secondary battery, not only can the high-temperature cycle performance be further improved, but also the high-temperature storage performance can be improved, the battery impedance can be reduced, the fast-charge performance can be improved, and both the fast-charge performance and the high-temperature performance under high voltage can be realized.

The invention provides a preparation method of an alumina-based composite diaphragm, and belongs to the field of alkaline electrolytic water hydrogen production diaphragm materials.The preparation method comprises the steps that a film-forming polymer, functionalized alumina particles and hydrophilic particles are dissolved in an organic solution, and a film casting solution is obtained; the preparation method comprises the following steps: pouring a membrane casting solution on a glass plate for blade coating to prepare a single-sided homogeneous membrane, immersing a PPS base net into the single-sided homogeneous membrane, blade coating a layer of homogeneous membrane on the base net, and finally carrying out pre-evaporation, coagulating bath and drying to prepare the alkaline electrolytic water hydrogen production composite membrane. The diaphragm prepared by the invention has the advantages of high electrolytic efficiency, high bubble point pressure, excellent hydrophilicity, low diaphragm impedance and the like.

The invention provides a battery composite isolating membrane. The battery composite isolating membrane comprises a polyolefin base material; the surface of the first solid electrolyte particle is provided with siloxane groups; the surface of the second solid electrolyte particle is coated and modified by one or more of PVDF (Polyvinylidene Fluoride), PEO (Polyethylene Oxide) and PMMA (Polymethyl Methacrylate); the first solid electrolyte particles are distributed in internal holes of the polyolefin base material, and the second solid electrolyte particles are distributed on the surface of the polyolefin base material. The battery composite isolating membrane has low impedance, high ionic conductivity and high safety, and is suitable for being used as a diaphragm of a lithium ion battery. The invention further provides a preparation method of the battery composite isolating membrane.

The invention relates to an S-doped g-C3N4 coated modified graphite material, a preparation method thereof and a lithium ion battery negative electrode. The method comprises the following steps: mixing a g-C3N4 precursor with a sulfur source, and then carrying out heat treatment under the condition of shielding gas to obtain sulfur-doped graphite phase carbon nitride S-g-C3N4; carrying out plasma modification treatment on the surface of the graphite material by adopting plasma reaction gas to obtain modified graphite; mixing S-g-C3N4 with the modified graphite to obtain a mixed material; and calcining the mixed material in a protective gas environment to obtain the S-doped g-C3N4 coated modified graphite material. The invention also provides the graphite material prepared by the method and a lithium ion battery negative electrode prepared from the graphite material. The graphite material has relatively high conductivity, interface compatibility and structural stability.

The invention provides a silicon-based negative electrode material which comprises a silicon-based inner core and a coating layer coating the silicon-based inner core, the coating layer is made of a carbon material and a fast ion conductor, and the mass content of the fast ion conductor in the coating layer is gradually increased in the direction from the silicon-based inner core to the coating layer. The silicon-based negative electrode material is excellent in ionic conductivity and electronic conductivity, stable in structure and beneficial to being used in a negative electrode. The invention also provides a preparation method of the silicon-based negative electrode material, a negative electrode, a battery and electric equipment.

The invention discloses a negative pole piece, a battery and electric equipment, the negative pole piece comprises a current collector, the thickness direction of the current collector is a first direction; the negative active material layer is arranged on at least one surface of the current collector; the negative electrode active material layer comprises a first active coating and a second active coating which are alternately arranged in a second direction perpendicular to the first direction, and the first active coating and the second active coating meet the following conditions: Ds2 / Ds1 < = 0.5 and D502 / D501 > = 1.3, so that the material structure is not damaged while the risk of a disruption phenomenon can be reduced.

A wind power blade lightning arrester comprises a connecting part and a lightning arresting part, one end of the connecting part is connected with a blade tip of a wind power blade and connected with a cable, the other end of the connecting part is detachably connected with the lightning arresting part, the lightning arresting part is at least provided with a first contact face, and the connecting part is at least provided with a second contact face. And the connecting bolt penetrates through the contact surface I and the contact surface II to be tightly attached to form a conductive surface. According to the wind power blade lightning arrester, the connecting part and the lightning arresting part are tightly attached through the contact surfaces matched with each other to achieve electrical conduction, the contact area of the connecting part and the lightning arresting part is increased, impedance of electrical conduction after lightning is led is reduced, and the service life of the lightning arrester can be effectively prolonged.

In order to solve the problems that although an existing lithium ion battery with an electrolyte added with FEC can improve the cycle performance of the battery, the high-temperature storage gas production amount of the battery is large, and the battery impedance is high, the invention provides a non-aqueous electrolyte and a lithium battery, the non-aqueous electrolyte comprises a lithium salt, an organic solvent and an additive, the additive comprises a first additive and a carbonic ester compound, the carbonic ester additive comprises fluoroethylene carbonate, the first additive comprises a compound as shown in a structural formula 1, the lithium salt comprises lithium hexafluorophosphate, lithium bis (fluorosulfonyl) imide and # imgabs0, and the non-aqueous electrolyte meets a relational formula 1; a / (b + c) is more than 5.2 and less than 20.7, and the relational expression is 1. The non-aqueous electrolyte provided by the invention can reduce the interface impedance, improve the cycle performance of the battery, reduce the impedance increase of the battery and inhibit the high-temperature storage gas production of the battery, and also considers the quick charge demand of the battery.

The invention discloses an electronic circuit and a control method for improving electromagnetic ultrasonic transmitting power and receiving efficiency, an electromagnetic ultrasonic transducer adopts N sub-coils as an integral mother coil, and when high voltage is transmitted, the N sub-coils are connected in parallel by using the electronic circuit and are connected to a high-voltage power supply output network; when a signal is received, the electronic circuit connects the N sub-coils in series to form a large coil for receiving an electromagnetic ultrasonic echo signal so as to enhance an electromotive force signal received in the coil. According to the control circuit, the impedance of the transducer is reduced during high-voltage emission, the power of a power supply obtained by the transducer is improved, an ultrasonic echo signal output by the transducer is increased during receiving, differential symmetric output of a transducer signal is realized, common-mode noise of the transducer is suppressed, and the signal-to-noise ratio of a received signal is improved. The problem that the signal-to-noise ratio of electromagnetic ultrasonic echo signals is not high due to the fact that the conversion efficiency of the same transducer is difficult to further improve on the basis of an existing electromagnetic ultrasonic technology is solved.

This invention relates to the field of battery technology, specifically to a separator layer and a battery including the separator layer. The separator layer comprises nanofibers and inorganic particles embedded within the nanofibers. The separator layer of this invention combines high air permeability and high puncture strength; batteries including the separator layer of this invention have low self-discharge levels, low impedance, and high safety performance.

The invention relates to the technical field of electronic equipment, in particular to a fan and electronic equipment. The fan provided by the embodiment of the invention comprises a hub, a first connecting ring and a second connecting ring, the first connecting ring is arranged around the hub, a plurality of first blades are arranged between the hub and the first connecting ring, and the first blades extend from the hub to the first connecting ring; a second connecting ring is arranged around the first connecting ring, a plurality of second blades are arranged between the first connecting ring and the second connecting ring, and the second blades extend from the first connecting ring to the second connecting ring; the number of the second blades is larger than that of the first blades. According to the fan provided by the embodiment of the utility model, the impedance of the fan blades can be reduced, so that the suction force to air can be increased, and the overall heat dissipation performance of a system is improved.

The invention belongs to the technical field of composite electrode materials, and relates to a preparation method of a nano flower ball Ov-(Ni0. 5Co0. 5) V2O8 / P (at) CNT composite film electrode material, which comprises the following steps: uniformly mixing and stirring a cobalt salt-CNT methanol solution and a 2-methylimidazole methanol solution in equal volume, and carrying out suction filtration to obtain a ZIF-67 (at) CNT film; then immersing in a solution prepared from nickel salt, K2S2O8, ammonia water and deionized water to obtain a NiCo-LDH-coated CNT film; then immersing the CNT film into a solution prepared from NH4VO3, ammonia water and deionized water to obtain a (Ni0. 5Co0. 5) 3V2O8 coated CNT composite film; and finally, carrying out high-temperature phosphorization. The prepared composite material is also applied to a supercapacitor electrode. The carbon nano tube provides a flexible substrate for the self-supporting material, the conductivity and the specific surface area of the material are greatly increased, meanwhile, (Ni0. 5Co0. 5) V2O8 directly grows on the carbon nano tube in situ, the use of an adhesive is avoided, the impedance of the material is reduced, and in addition, the doping of P also provides a large number of reactive active sites for the electrode material.