62results about How to "Reduced Polarization Voltage" patented technology

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

The invention belongs to the field of application of graphene materials to electrostatic loudspeakers, and relates to a novel graphene composite type electrostatic loudspeaker diaphragm which comprises a loudspeaker diaphragm body and graphene coatings coating the two sides of the loudspeaker diaphragm body, the loudspeaker diaphragm body is a polymer film, and the thickness ranges from 2 micrometers to 7 micrometers. the graphene coating is prepared from the following components in parts by weight: 5-50 parts of a water-based film forming base material; 1-20 parts of a graphene slurry; 5-50 parts of deionized water; 5-50 parts of a cosolvent; And 1-10 parts of an auxiliary agent. The vibrating diaphragm is compounded with the graphene material, so that the structural strength of the vibrating diaphragm is enhanced under the condition that the thickness and the mass of the vibrating diaphragm are not changed basically, and the flexibility of the vibrating diaphragm is better; Meanwhile, the graphene has excellent superconducting performance; Uniform island type polarization charge points are formed on the surface of the vibrating diaphragm, the analyzing capacity of the vibrating diaphragm on a sound source is improved, the distortion rate of sound is reduced, and due to the fact that the graphene is high in heat conductivity coefficient, resistant to acid, alkali and salt andother chemicals and high in adhesive force with the PEI diaphragm, the graphene composite vibrating diaphragm is good in heat dissipation, good in abrasion resistance and improved in aging resistance.

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.

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.

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.

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.

Lead-free piezoelectric composites and methods of making and uses thereof are described. The lead-free piezoelectric composites have high flexibility and high piezoelectric properties.

The invention discloses a zinc-copper negative electrode which comprises a zinc current collector and a copper film covering the zinc current collector. The invention also provides a preparation method of the zinc-copper negative electrode and a zinc ion battery applying the zinc-copper negative electrode. The zinc-copper negative electrode provided by the invention can improve the stability of the zinc ion battery and prolong the cycle life of the zinc ion battery.