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62results about How to "Reduced Polarization Voltage" patented technology
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Preparation method of semi-interpenetrating network polymer gel electrolyte membrane
The invention provides a preparation method of a semi-interpenetrating network polymer gel electrolyte membrane. The method comprises the following steps: (A) adding a linear polymer and a solvent to a sample bottle, stirring and dissolving the linear polymer and the solvent, adding polyethylene glycol dimethyl acrylic ester, vinylene carbonate and a photoinitiator, and mixing the polyethylene glycol dimethyl acrylic ester, the vinylene carbonate and the photoinitiator evenly to form a solution; (B) coating a glass plate with the solution, covering a layer of glass plate to form a sandwich structure, and curing the sandwich structure to obtain an ultraviolet-cured semi-interpenetrating network polymer membrane; and (C) immersing the ultraviolet-cured semi-interpenetrating network polymer membrane into liquid electrolyte. According to the gel electrolyte provided by the invention, the balance between the ionic conductivity and the mechanical property is relatively well realized; the ionic conductivity at room temperature can be up to 1.49*10<-3>S cm<-1>; the mechanical property is good; the heat stability is good; the electrolyte can be prevented from leaking; the interface stability is good; and a lithium iron phosphate / metal lithium battery assembled by the gel polymer electrolyte membrane has excellent cycle performance and rate performance.
Owner:SHANGHAI JIAO TONG UNIV
Total temperature-range lithium ion battery
ActiveCN103325991AImprove breathabilityImprove high temperature resistanceCell seperators/membranes/diaphragms/spacersSecondary cellsComposite electrolyteInternal resistance
The invention provides a total temperature-range lithium ion battery. The total temperature-range lithium ion battery comprises a multi-tab anode piece having a compound multi-layer coating structure, a multi-tab cathode piece having a compound multi-layer coating structure, a high temperature-resistant diaphragm and a high / low temperature composite electrolyte. Each one of two sides of a part 4 on positive and negative current collectors is orderly coated with a rapid charging / discharging layer 1 (1a, 1b), a transition layer 2 (2a, 2b) and a slow charging / discharging layer 3 (3a, 3b). Through the structure, the total temperature-range lithium ion battery has rapid charging / discharging performances without battery energy density reduction. Through the multi-tab structure, the high temperature-resistant diaphragm and the high / low temperature composite electrolyte, battery ohmic resistance and electrochemical interface impedance are reduced and battery safety is improved. The total temperature-range lithium ion battery can realize normal charging and discharging at a temperature of -40 to 75 DEG C and has excellent low-temperature high-magnification characteristics and high-temperature and long-life performances.
Owner:余玉英 +1
Shearing-type piezoelectric composite material
ActiveCN104821372ALow working voltageReduced Polarization VoltagePiezoelectric/electrostrictive device material selectionEpoxyOptoelectronics
The invention discloses a shearing-type piezoelectric composite material. The outermost two layers of the composite material structure are flexible insulated thin films, the middle layer is a piezoelectric phase / epoxy resin composite layer, and interdigital electrodes are arranged between the middle layer and the flexible insulated thin films; the positive electrode finger parts and the negative electrode finger parts of the interdigital electrodes are arranged alternatively at equal distances, and the upper interdigital electrode and the lower interdigital electrode are in mirror symmetry and aligned; the finger parts of the interdigital electrodes are parallel to the piezoelectric phase of the piezoelectric phase / epoxy resin composite layer, and the electrode finger parts are located on the upper surface and the lower surface of the edge of the piezoelectric phase and epoxy resin joining surface; and the piezoelectric phase polarization direction is a direction vertical with the composite layer plane. The sheet piezoelectric composite material provided by the invention is thin in thickness, compact in structure, can fit a curved surface structure, can realize a certain degree of flexible deformation, and can be made into a driver, a sensor and the like.
Owner:CENT SOUTH UNIV
Three-dimensional crosslinked network polymer gel electrolyte membrane, preparation method and lithium-ion battery
ActiveCN105958122AImprove mechanical stabilityImprove interface compatibilityFinal product manufactureElectrolyte accumulators manufacturePolymer scienceLithium metal
The invention provides a preparation method of a three-dimensional crosslinked network polymer gel electrolyte membrane. The method comprises the following steps of: (S1) mixing a linear polymer, polyethylene glycol diglycidyl ether, bisphenol A diglycidyl ether, polyether amine and a solvent to obtain a precursor solution; (S2) heating the precursor solution A for constant-temperature reaction for a period of time to obtain a three-dimensional crosslinked network polymer membrane; and (S3) immersing the three-dimensional crosslinked network polymer membrane into a liquid electrolyte for adsorption to saturation, thereby preparing the three-dimensional crosslinked network polymer gel electrolyte membrane. The three-dimensional crosslinked network polymer gel electrolyte membrane prepared by the method is good in mechanical stability, high in ionic conductivity and good in lithium metal interface compatibility. The invention further provides the three-dimensional crosslinked network polymer gel electrolyte membrane prepared by the preparation method, and a lithium-ion battery employing the three-dimensional crosslinked network polymer gel electrolyte membrane.
Owner:SHENZHEN GRADUATE SCHOOL TSINGHUA UNIV
High-efficiency cement-based piezoelectric material and synthesizing method thereof
The invention relates to a high-efficiency cement-based piezoelectric material and a synthesizing method thereof. The high-efficiency cement-based piezoelectric material is characterized by comprising the following steps of: performing ball-milling on 45 to 70 volume percent of plumbum zirconate titanate (PZT) and the balance of cement and reinforcing phase, wherein the cement accounts for 65 to 95 weight percent, and the reinforcing phase accounts for 5 to 35 weight percent, mixing uniformly, adding water and a superplasticizer, stirring uniformly, pressing for forming, maintaining, and polarizing to obtain the high-efficiency cement-based piezoelectric material. After the high-efficiency cement-based piezoelectric material is placed for 30 days, a piezoelectric strain constant d33 is between 70 and 100 pC / N. The high-efficiency cement-based piezoelectric material is high in piezoelectric performance, a preparation process is easy and convenient, is small in required polarization voltage, low in cost and convenient to apply and popularize.
Owner:WUHAN UNIV OF TECH
Electroencephalogram signal wireless collecting system
ActiveCN105769182ASimple structureLow priceDiagnostic recording/measuringSensorsPower flowAudio power amplifier
The invention discloses an electroencephalogram signal wireless collecting system which comprises a control module, a wireless electrode cap module and an electroencephalogram processing module.The control module, the wireless electrode cap module and the electroencephalogram processing module are each provided with a wireless signal transmission module.The wireless electrode cap module further comprises a microcurrent stimulator, a dry electrode and an electroencephalogram resistance detecting device.The microcurrent stimulator receives a control instruction wirelessly sent by the control module and simulates the electrode to output simulation current to act on scalp.The dry electrode collects an electroencephalogram signal fed back by the scalp and sends the signal to the electroencephalogram resistance detecting device, and the signal is processed and then transmitted to an amplifier through the corresponding wireless signal transmission module to be amplified.The dry electrode structure in the electroencephalogram signal wireless collecting system is improved, the dry electrode can make tighter contact with scalp, and the signal to noise ratio is higher.
Owner:WUHAN ZHIPU TIANCHUANG TECH CO LTD
Polymer gel electrolyte membrane, preparation method and sodium ion battery
InactiveCN107154513AImprove mechanical stabilityStable interfacial compatibilitySecondary cellsElectrolyte immobilisation/gelificationPolymer sciencePolyethylene glycol
The invention discloses a preparation method of a polymer gel electrolyte membrane. The preparation method includes following steps: S1, mixing polyethylene glycol diglycidyl ether, polyether amine and solvent to obtain a precursor solution; S2, applying the precursor solution on a porous thin film, and heating for reaction to obtain a polymer membrane supported by the porous thin film; S3, soaking the polymer membrane in liquid-state electrolyte to adsorb the same to obtain the polymer gel electrolyte membrane supported by the porous thin film. The polymer gel electrolyte membrane is high in mechanical stability, ion conductivity and compatibility with a metal sodium interface. The invention further provides the polymer gel electrolyte membrane prepared by the method and a sodium secondary battery using the polymer gel electrolyte membrane.
Owner:SHENZHEN GRADUATE SCHOOL TSINGHUA UNIV
Method for preparing textured lead zirconate titanate ceramic
InactiveCN101913865AImprove piezoelectric performanceReduced Polarization VoltageStrontium titanateLead zirconate titanate
The invention discloses a method for preparing textured lead zirconate titanate ceramic, namely a method for preparing highly textured PZT piezoelectric ceramic with a (001) direction. The method for preparing the textured lead zirconate titanate ceramic comprises the following steps of: preparing a strontium titanate template with a laminated microstructure from strontium carbonate and titanium dioxide serving as raw materials by using a two-step molten salt method; adding the template into PZT powder, casting, tabletting and sintering to prepare a PZT block material with higher texturing, piezoelectric coefficient and electromechanical coupling coefficient; and adding the strontium titanate template in microscopic directed arrangement into the PZT ceramic, making the template have directivity in the PZT ceramic by using a casting method, and making the PZT ceramic grow directionally along the template direction to have a highly textured structure similar to a single-crystal structure. The piezoelectric ceramic has higher orientation degree, and has the piezoelectric property greatly improved in the aspects such as piezoelectric constant, piezoelectric coupling coefficient and the like compared with the common PZT.
Owner:HARBIN INST OF TECH
A composite piezoelectric material prepared from piezoceramic powder, carbon black and asphalt and a preparing method thereof
InactiveCN104891867ASolve interface compatibility issuesSolve the difficult problem of polarization processElectricityAging resistance
A composite piezoelectric material prepared from piezoceramic powder, carbon black and asphalt and a preparing method thereof are provided. The composite piezoelectric material is prepared from 25-60 parts by weight of the asphalt, 2-5 parts by weight of the carbon black, 320-630 parts by weight of the piezoceramic powder and 1-10 parts by weight of an asphalt modifier. The problems of interfacial compatibility and difficult polarization processes are overcome. The composite piezoelectric material can provide electricity for monitoring systems, can be used as sensors, and is good in compatibility with road surfaces. Natural asphalt and petroleum asphalt have good compatibility and durable ageing resistance, thus largely improving pavement performance of the substrate asphalt. The piezoceramic-carbon black-asphalt composite material improves interfacial compatibility of the piezoceramic and the asphalt, reduces the polarization voltage of the composite piezoelectric material, and improves piezoceramic properties of the composite piezoelectric material.
Owner:HARBIN ENG UNIV
Method for nano-scale periodic poling of lithium niobate film
InactiveCN107561817AHigh yieldReduced Polarization VoltagePhotomechanical apparatusNon-linear opticsSingle crystalPeriodic poling
The invention discloses a method for nano-scale periodic poling of a lithium niobate film. The method comprises the following steps: firstly executing the whirl coating on the surface of a lithium niobate monocrystal film sample, and executing the mould pressing to obtain a nano comb-like structure, plating a metal film layer on the nano comb-like structure as a top electrode, and executing the poling processing through the conductive electrode layer and the top electrode in the lithium niobate monocrystal film sample, and finally removing the whirl coating and the conductive electrode layer to obtain the periodic poling lithium niobate film. The preparation process of the method is convenient and is easily operated. A large area of a nano-scale periodic poling domain inversion structure can be obtained on the lithium niobate monocrystal film with hundreds of nanometers of the thickness through the method.
Owner:SHANGHAI JIAO TONG UNIV
Preparation method of shearing type piezoelectric fiber composite material
ActiveCN107910434ASolve the problem of polarization only in the length directionReduced Polarization VoltagePiezoelectric/electrostrictive device manufacture/assemblyPiezoelectric/electrostrictive device material selectionFiberLead zirconate titanate
The invention discloses a preparation method of a shearing type piezoelectric fiber composite material. The preparation method comprises the following steps of performing cutting on one surface of a lead zirconate titanate piezoelectric ceramic sheet polarized in the thickness direction to form uniformly arranged piezoelectric fibers; filling the fiber gaps with epoxy resin and performing curing to obtain piezoelectric fibers filled with epoxy resin; performing thinning on one surface, opposite to the cutting surface, of the lead zirconate titanate piezoelectric ceramic sheet to obtain a leadzirconate titanate piezoelectric ceramic-epoxy resin composite layer; enabling the upper and lower surfaces of the lead zirconate titanate piezoelectric ceramic-epoxy resin composite layer to be compounded with flexible interdigital electrodes by epoxy resin, wherein the flexible interdigital electrodes on the upper and lower surfaces are in mirror symmetry, and the finger parts of the flexible interdigital electrodes are parallel to the piezoelectric fibers; and performing curing on the epoxy resin. The method is simple in process, and the obtained piezoelectric fiber composite material has high overall performance and clear piezoelectric fibers, certain flexibility and bending deformation resistance, and high electrical performance, strain performance and driving performance.
Owner:CENT SOUTH UNIV
A vehicle power battery module
InactiveCN102263300AReduced Polarization VoltageReduce harmCell electrodesSecondary cells charging/dischargingPower batteryInternal resistance
The invention belongs to the field of battery modules, and specifically discloses a vehicle-mounted power battery module. The on-vehicle power battery module includes a power battery pack, which is composed of several power single cells connected in series; it also includes a pulse buffer battery pack connected in parallel with the power battery pack, and the pulse buffer battery pack is composed of several pulse buffer single cells connected in series; The voltage at both ends of the battery pack is equal to the voltage at both ends of the pulse buffer battery pack, and the ratio of the polarization internal resistance of the power single battery to the polarization internal resistance of the pulse buffer single battery is 1:0.5-1:0.1. The vehicle-mounted power battery module of the present invention can effectively resist the damage caused by the braking pulse current; after the impact of the pulse current, it can effectively maintain the cycle performance and safety performance of the vehicle-mounted power battery module.
Owner:BYD CO LTD
Flexible and elastic electrode and application thereof
InactiveCN105935294APolarized electromotive force is smallReliable contactDiagnostic recording/measuringSensorsFiberIndium
The present invention discloses a flexible and elastic electrode and application thereof. The electrode comprises elastic fiber and silver alloy plated fiber, the proportion of the elastic fiber and the silver alloy plated fiber is 1:1-50, and the elastic fiber and the silver alloy plated fiber are integratedly connected in a knitting manner. The silver alloy is composed of silver and more than one metal elements selected from tin, zinc, nickel, copper, gold, cadmium, lead, bismuth, indium and gallium. In the silver alloy plated fiber, the silver makes up 10-70% of the fiber weight, and the one metal elements selected from tin, zinc, nickel, copper, gold, cadmium, lead, bismuth, indium and gallium make up 0.01-20% of the fiber weight. The electrode is especially suitable for a wearable device, reliable contact between the electrode and the human skin is ensured, the electrode has the characteristics of low power consumption, low impedance, long service lifetime, high elasticity, high strength, stretching resistance, light weight, small size and good flexibility, the electrode can be bent, folded and washed, is comfortable to wear, convenient use and not easy to be polarized, and is safe and reliable, and long-term monitoring of myoelectricity, brain electricity, electrocardio, heart rate, respiration and body temperature of a human body can be achieved.
Owner:BEIJING JLSUN HIGH TECH CO LTD
Piezoelectric driving element having multilayer piezoelectric composite membrane structure
InactiveCN1564334AImprove reliabilityExtended service lifePiezoelectric/electrostrictive devicesSilicon oxideSilicon dioxide
Disclosed piezoelectric driving device belonging to MEMS device is applicable to micro displacement device, read / write head in driving arm of hard disk. Following layers are prepared on silicon substrate from bottom up by using general MEMS method: silicon substrate, thermooxidizing silicon dioxide layer, adhesion layer of metallic titanium, metal platinum layer with bottom electrode, composite layer between 1-N layer piezoelectric thin film PZT layer and metal platinum layer with inner electrode, silicon oxide layer and aluminum lead layer. Triplex layer parallel connection structure is adopted in the invention. Comparing with original structure in cantilever beam type, displacement at end part is raised three times in the invention under identical driving voltage and identical structured thickness. Or, driving voltage can be lowered to 1 / 3 of original voltage under identical displacement at end part.
Owner:TSINGHUA UNIV
Intermediate infrared laser device with tunable inner cavity OPO
InactiveCN104577700AHigh light conversion efficiencyAchieve laser outputOptical resonator shape and constructionActive medium materialPlane mirrorOptoelectronics
The invention discloses an intermediate infrared laser device with an tunable inner cavity OPO. The intermediate infrared laser device comprises an LD semiconductor pumping source, an optical fiber coupling system, a laser gain crystal, an air-cooling radiator, a crystal temperature control furnace, a film-coated endoscope and a periodically poled crystal. The film-coated endoscope comprises a front-cavity mirror plane mirror M1, an intracavity focusing lens, an OPO front-cavity mirror plane mirror M2 and a rear-cavity mirror M3. A light source generated by the LD semiconductor pumping source passes through the optical fiber coupling system and is output. The front-cavity mirror plane mirror M1, the laser gain crystal, the intracavity focusing lens, the OPO front-cavity mirror plane mirror M2, the periodically poled crystal and the rear-cavity mirror M3 are sequentially arranged in the output direction of the coupling light source of the optical fiber coupling system in parallel. The laser gain crystal is arranged on the air-cooling radiator. The periodically poled crystal is arranged on the crystal temperature control furnace. The intermediate infrared laser device is simple and compact in structure, low in energy consumption and capable of being miniaturized and fully solidified easily, and can be mounted onboard or on vehicles.
Owner:NANJING UNIV
A novel graphene composite type electrostatic loudspeaker diaphragm and a preparation method thereof
InactiveCN109743671AStable structureReduced Polarization VoltageElectrical transducersElectrically-conductive paintsWater basedSound sources
Owner:SHENZHEN GUOCHUANG JIAWEI GRAPHENE TECH CO LTD +1
Application method of hard carbon negative electrode material in sodium-ion battery
InactiveCN111600021AEasy transferImpede passingFinal product manufactureElectrode collector coatingElectrolytic agentElectrical battery
The invention relates to an application method of a hard carbon negative electrode material in a sodium ion battery. According to the invention, commercial hard carbon is selected as a negative electrode material of a sodium-ion battery, NaPF6-DGM is used as an electrolytic solution, Celgard 2325 is used as a diaphragm, and the formed sodium ion battery has low polarization voltage and excellent cycle rate performance in the aspect of electrochemical property, has high first effect and coulombic efficiency, takes high capacity and long service life into consideration, and still has the capacity of 224.4 mAh g<-1> after being circulated 3500 circles under the current density of 1 A g<-1>.
Owner:SHANDONG UNIV
Diaphragm coating, loudspeaker diaphragm and preparation method thereof, and electrostatic loudspeaker
PendingCN110430514AImprove migration speedImprove resolutionElectrostatic transducer loudspeakersNon-planar diaphragms/conesTransformerEngineering
The invention relates to a diaphragm coating, a loudspeaker diaphragm, a preparation method of the loudspeaker diaphragm and an electrostatic loudspeaker. The electrostatic loudspeaker comprises a loudspeaker diaphragm, two polar plates and a boosting transformer, the two polar plates are vertically arranged on the two sides of the loudspeaker diaphragm respectively, and the loudspeaker diaphragmis connected with the positive electrode of the output end of a power amplifier; and the two polar plates are connected with the negative electrode of the output end of the power amplifier through a boosting transformer. Compared with the prior art, the cost of the electrostatic loudspeaker can be reduced, the operation is simple, the performance is stable, the processing precision is high, and the service life is long.
Owner:宗阳阳
A kind of shear piezoelectric composite material
ActiveCN104821372BLow working voltageReduced Polarization VoltagePiezoelectric/electrostrictive device material selectionEpoxyEngineering
A shear type piezoelectric composite material, the outermost two layers of the composite material structure are flexible insulating films, the middle layer is a piezoelectric phase / epoxy resin composite layer, and interdigitated electrodes are placed between the middle layer and the flexible insulating film; The positive and negative fingers of the interdigitated electrodes are arranged alternately and equidistantly, and the upper and lower two interdigitated electrodes are mirror-symmetrical and aligned; the fingers of the interdigitated electrodes are aligned with the piezoelectric phase / The piezoelectric phases of the epoxy resin composite layer are parallel, and the electrode fingers are located on the upper and lower sides of the edge of the piezoelectric phase and the epoxy resin bonding surface; the polarization direction of the piezoelectric phase is a direction perpendicular to the plane of the composite layer. The invention provides a sheet-shaped piezoelectric composite material with thin thickness, compact structure, capable of fitting curved surface structures and realizing a certain degree of flexible deformation, which is suitable for making drivers, sensors and the like.
Owner:CENT SOUTH UNIV
Metal oxide composite self-supporting heat-conducting carbon film, metal lithium negative electrode and preparation and application of metal oxide composite self-supporting heat-conducting carbon film
ActiveCN111244390AUniform depositionPorosity adjustableElectrode manufacturing processesLi-accumulatorsCarbon filmMetallic lithium
The invention belongs to the technical field of lithium metal batteries, and particularly discloses a preparation method of a metal oxide composite self-supporting heat-conducting carbon film. The method comprises the following steps of (1) cracking a polymer to obtain a polymer carbon material, mixing the polymer carbon material with graphene, and pressing to form a film, namely obtaining the self-supporting heat-conducting carbon film; and (2) carrying out coordination reaction on a solution containing the self-supporting heat-conducting carbon film, an M metal source and an organic ligand to obtain a metal organic framework-self-supporting heat-conducting carbon film material, and then carrying out carbonization treatment to obtain the self-supporting metal oxide composite heat-conducting carbon film. The invention also provides a negative electrode obtained by filling the metal oxide composite self-supporting heat-conducting carbon film with lithium and an application method of thenegative electrode in a lithium metal battery. The material obtained by the technical scheme provided by the invention has excellent performance, and can significantly improve the long cycle performance of the lithium metal battery.
Owner:CENT SOUTH UNIV
Carbon oxide ball doped solid polymer electrolyte membrane and preparation method and application thereof
ActiveCN110911741AIncrease contactLower impedanceSolid electrolytesFinal product manufacturePolymer electrolytesPhysical chemistry
The invention provides a carbon oxide ball doped solid polymer electrolyte membrane and a preparation method and application thereof. The preparation method comprises the following steps: adding carbon oxide spheres into an organic solvent, ultrasonically stirring to obtain a uniform solution, adding a polymer matrix, and uniformly stirring to obtain a mixed solution; and carrying out film formingtreatment on the mixed solution, and drying to obtain the solid polymer electrolyte membrane. The carbon oxide sphere doped solid polymer electrolyte prepared by the method has the advantages of better mechanical property, higher specific capacity, lower polarization voltage, stronger cycling stability and the like, and provides a new possibility for the development of solid polymers.
Owner:CHINA UNIV OF PETROLEUM (BEIJING)
Preparation method of piezoelectric film based on PVDF-TrFE
The invention relates to a preparation method of a PVDF-TrFE-based piezoelectric film, which comprises the following steps: KH-550 is used for modifying CNT powder, the modified CNT powder is dissolved in N-Dimethylformamide (DMF) solution, PVDF-TrFE is added after ultrasonic oscillation, then stirring is carried out till uniform stirring, PMN-PT powder is added, stirring is carried out, ultrasonic dispersion is carried out till uniform dispersion, the obtained composite solution is coated on a casting plate which is horizontally placed, the solution flows uniformly, then the casting plate is placed in an oven for drying, so that a dry casting film is obtained, hot press molding is carried out on the casting film, and the 0-0-3 type CNT / PVDF-TrFE / PMN-PT flexible composite piezoelectric film is obtained.The 0-0-3 type CNT / PVDF-TrFE / PMN-PT flexible composite piezoelectric film which has good flexibility and high piezoelectric property, and can be applied to medical ultrasonic probes, underwater acoustic transducers and the like.
Owner:ZHEJIANG LAB
Preparation method of semi-interpenetrating network polymer gel electrolyte membrane
The invention provides a preparation method of a semi-interpenetrating network polymer gel electrolyte membrane. The method comprises the following steps: (A) adding a linear polymer and a solvent to a sample bottle, stirring and dissolving the linear polymer and the solvent, adding polyethylene glycol dimethyl acrylic ester, vinylene carbonate and a photoinitiator, and mixing the polyethylene glycol dimethyl acrylic ester, the vinylene carbonate and the photoinitiator evenly to form a solution; (B) coating a glass plate with the solution, covering a layer of glass plate to form a sandwich structure, and curing the sandwich structure to obtain an ultraviolet-cured semi-interpenetrating network polymer membrane; and (C) immersing the ultraviolet-cured semi-interpenetrating network polymer membrane into liquid electrolyte. According to the gel electrolyte provided by the invention, the balance between the ionic conductivity and the mechanical property is relatively well realized; the ionic conductivity at room temperature can be up to 1.49*10<-3>S cm<-1>; the mechanical property is good; the heat stability is good; the electrolyte can be prevented from leaking; the interface stability is good; and a lithium iron phosphate / metal lithium battery assembled by the gel polymer electrolyte membrane has excellent cycle performance and rate performance.
Owner:SHANGHAI JIAOTONG UNIV
Composite electrode material and preparation method and application thereof
ActiveCN114242989AHigh Li-ion conductivityStrong LithophilicityNegative electrodesLi-accumulatorsMetallic lithiumEther
The invention provides a composite electrode material and a preparation method and application thereof.The composite electrode material comprises a pole piece base body and an artificial solid electrolyte layer wrapping the surface of the pole piece base body, the artificial solid electrolyte layer is composed of a first polymer, and the structure of the first polymer is shown in the formula I; wherein n is equal to 10 to 1000; the pole piece substrate is at least one of lithium metal or a composite material containing metal lithium. According to the invention, the ether-containing side group copolymer is used as the artificial solid electrolyte layer to coat the surface of the electrode substrate to protect the electrode substrate, the solid electrolyte layer interface has high ion conduction rate and strong lithium affinity, the electrolyte is prevented from reacting with the electrode substrate while inducing uniform deposition of lithium ions, the interface of the electrode substrate is stabilized, and the service life of the electrode substrate is prolonged. And therefore, the consumption of the electrolyte is reduced.
Owner:CENT SOUTH UNIV
Method for reducing polarization of lithium battery
InactiveCN111755764AReduced Polarization VoltageReduce polarizationSecondary cells charging/dischargingElectrical batteryPhysical chemistry
The invention discloses a method for reducing polarization of a lithium battery. The method comprises the steps of S1, discharging the lithium battery to a discharging cut-off voltage of 2.5V; S2, performing positive and negative pulse charging on the lithium battery until the charging cut-off voltage is 4.2V, and recording the charging time; S3, placing the charged lithium battery for 50 to 70 minutes; and S4, carrying out constant-current discharging on the lithium battery under the condition that the charging average multiplying power is 0.2-3C, and recording the electric quantity discharged when the lithium battery is discharged. The method has the advantages that new substances do not need to be involved, and the battery polarization reaction can be effectively reduced.
Owner:天科新能源有限责任公司
Carbon fiber-loaded magnesium oxide particle crosslinked nanosheet array composite material and its preparation method and application
ActiveCN110010895BReduced Polarization VoltageUniform depositionCell electrodesSecondary cellsMetallic lithiumFiber
The invention discloses a carbon fiber loaded magnesium oxide particle cross-linked nanosheet array composite material and a preparation method thereof, and application of carbon fiber loaded magnesium oxide particle cross-linked nanosheet array composite material as lithium metal battery anode framework material in preparation of the anode of the lithium metal battery. The method comprises the following steps of: loading magnesium hydroxide nanosheets on carbon fibers in an electrodeposition mode, and performing heat treatment on the carbon fibers on this basis to obtain a lithium-philic magnesium oxide particle cross-linked nanosheet array. The lithium-philic magnesium oxide particle cross-linked nanosheet array is taken as the lithium metal battery anode framework material to assemble with a metal lithium sheet to form a battery for electrochemical deposition to deposit the lithium metal to obtain the anode of the metal battery. The anode of the lithium metal battery obtained afterdepositing can still show a low polarization voltage, high deposition-dissolution efficiency and long life, is excellent in electrical properties and has wide application prospects.
Owner:ZHEJIANG UNIV
Terahertz-frequency-band transparent piezoelectric film, ultrasonic transducer and preparation method of terahertz-frequency-band transparent piezoelectric film
ActiveCN114736465AImprove conductivityHigh transparencyMaterial analysis using sonic/ultrasonic/infrasonic wavesMaterial analysis by optical meansThin membranePhotoacoustic imaging in biomedicine
The invention discloses a terahertz-frequency-band transparent piezoelectric film, an ultrasonic transducer and a preparation method of the terahertz-frequency-band transparent piezoelectric film. The transparent piezoelectric film is formed by compounding an inorganic piezoelectric material, a conductive phase transparent in a terahertz frequency band and a polymer material. Then, the obtained transparent composite piezoelectric film of the terahertz frequency band is used as a core element to prepare a transparent ultrasonic transducer, and finally, the prepared ultrasonic transducer is applied to terahertz photoacoustic microscopic imaging, so that the light transmission efficiency in terahertz photoacoustic imaging is improved. The intensity of sound wave signals excited by the to-be-detected object after laser irradiation is improved, and then the definition of terahertz photoacoustic imaging is improved.
Owner:ZHEJIANG LAB
Flexible and low cost lead-free piezoelectric composites with high d33 values
PendingUS20220158075A1Increase blocking forceThinnerPiezoelectric/electrostrictive device manufacture/assemblyPiezoelectric/electrostrictive device material selectionEngineeringPiezoelectric composite
Owner:SABIC GLOBAL TECH BV
Electric vehicle battery vulcanization removing charging device manufactured by small-power power transformer
InactiveCN101834463AReduce volumeReduce running noiseBatteries circuit arrangementsElectric powerElectrochemical responseCapacitance
The invention relates to an electric vehicle battery vulcanization removing charging device manufactured by a small-power power transformer. A plurality of electrolytic capacitors are connected in series to realize the step-down of electric supply, a silicon rectifier diode is utilized to perform half-wave rectification, and a small-power power frequency power transformer is utilized to generate one-way silicon controlled trigger impulse, so that a trigger impulse circuit is simple and reliable; and although the charging device is not a charging device of a pure transformer without a power supply, a cumbersome master power transformer is thrown away, the problem of the isolation of an alternating-current power grid from the charging device is solved, and the hazard of electric shock of operators can be prevented effectively. The vulcanization removing charging device manufactured by the technical scheme can excite inert materials such as large-crystal lead sulfate and the like in a battery, so that the inert materials are converted into active materials to continue participating in electrochemical reaction and have the good vulcanization removing effect on an accumulator battery, the battery is fully charged and the service life of the battery is effectively prolonged. The electric vehicle battery vulcanization removing charging device can lighten the weight of the charging device effectively and reduce the consumption of non-ferrous metal substantially and the manufacturing cost; in addition, the vulcanization removing charging device has the characteristics of small volume, light weight, small running noise and the like.
Owner:李秉哲
Zinc-copper negative electrode, preparation method thereof and zinc ion battery
InactiveCN112687829AAvoid short circuitImprove stabilityElectrode manufacturing processesActive material electrodesElectrical batteryMaterials science
Owner:SHENZHEN GRADUATE SCHOOL TSINGHUA UNIV
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