55results about How to "Reduced polarization loss" patented technology

The invention provides a single-crystal lithium nickel manganese cobalt positive electrode material. The single-crystal lithium nickel manganese cobalt positive electrode material comprises a substrate, wherein the substrate is a compound shown as a formula I of LiNi<x>Co<y>Mn<1-x-y>M<z>O<2>, x is more than or equal to 0.3 but less than or equal to 0.75, y is more than or equal to 0.2 but less than or equal to 0.3, z is more than or equal to 0 but less than or equal to 0.1, and a coating layer is coated on a surface of the substrate and is one or more of Li2ZrO3, Li2SnO3, LiNbO3, Li4Ti5O12 and LiAlO2. Compared with the prior art, a fast ion conductor is coated on the surface, thus, the rate performance of a single-crystal material is improved, the gram capacity of the single-crystal material is improved, the cycle performance of the material is further improved, the internal resistance can also be reduced, the polarization loss is reduced, and the cycle lifetime of a battery is prolonged; and meanwhile, the advantage of large compaction of a single-crystal ternary material is maintained, a particle broken phenomenon caused by rolling particles similar to secondary particles during battery fabrication can be prevented due to relatively high compaction, and the cycle performance is improved.

The invention relates to a preparation method for a ternary positive electrode material with a special single-crystal structure. A general formula of the positive electrode material is LiNixCoyMnzMvO2, wherein a sum of x, y and z is 1, x is equal to or larger than 0.2 but smaller than or equal to 0.6; y is equal to or larger than 0.1 but smaller than or equal to 0.4; z is equal to or larger than 0.2 but smaller than or equal to 0.5; v is equal to or larger than 0.01 but smaller than or equal to 0.03; and M is one of Ti, Zn, Cr and F. The preparation method for the ternary positive electrode material with the special single-crystal structure comprises two steps of 1. preparing a precursor-cobalt nickel manganese oxide with the single-crystal structure; and 2. preparing a cobalt nickel manganese ternary material with the single-crystal structure.

An anion transport membrane is provided enabling efficient anion exchange across the membrane, which could be used in applications like fuel cells, water electrolyzers, or water filtration systems. The structural membrane morphology is based on a hydrophobic polysulfone membrane backbone and co-grafted thereon hydrophilic poly(ethylene glycol) grafts and anion conducting quaternary ammonium species. This structure defines a bi-continuous morphology with locally phase-separated hydrophobic-hydrophilic domains, and a co-localization of the anion conducting quaternary ammonium species with respect to the hydrophilic poly(ethylene glycol) grafts enabling efficient and continuous ion transport channels for facilitating anion transport.

The invention discloses a high-voltage and single-crystal ternary positive electrode material and preparation method thereof. The general formula of the material can be expressed with Li<x>Ni<1-m-n>Co<m>Mn<n>O2, wherein x is more than 0.96 but less than 1.12, m is more than 0 but less than 1, n is more than 0 but less than 1, and (m+n) is less than 1. The preparation method comprises the steps of preparing a precursor by taking a nickel salt, a cobalt salt and a manganese salt as raw materials and by employing a co-precipitation method or a chemical synthesis method, mixing the precursor with a lithium source, adding a modifying agent into the mixture after pre-processing, and performing sintering, smashing and sieving after uniform mixing to obtain the high-voltage and single-crystal ternary positive electrode material. The grain size of the prepared high-voltage and single-crystal ternary positive electrode material is 2-15 micrometers, and the compaction density reaches 3.8-3.9g / cm<3>; meanwhile, the surface of the ternary positive electrode material is modified by a wet process to package Al, the material structure is stabilized, and side reaction of the material and an electrolyte is prevented; and according to actual detection, the cycle property, the high-temperature storage performance and the safety performance of the lithium ion battery under high voltages of 4.4V and 4.5V are effectively improved.

The invention relates to a lithium-enriched manganese-based material precursor which is a lithium-enriched manganese-based carbonate precursor of a lamellar morphology, the particle size of the precursor is 1-7mu m, and the specific surface area of the precursor is 8-50m<2> / g. By adopting the lithium-enriched manganese-based carbonate precursor of the lamellar morphology, a lithium-enriched manganese-based anode material of a high single crystallization degree can be easily prepared. The invention further relates to a preparation method of the lithium-enriched manganese-based carbonate precursor of the lamellar morphology, and a preparation method and the application of the lithium-enriched manganese-based anode material of a single crystal morphology. Therefore, the mechanical strength, the stability, the compaction density, the capacity and the first efficiency of the micro structure of the anode material can be improved, and the voltage attenuation of the material can be inhibited.

The invention relates to a satellite-borne K-band phased array antenna circularly-polarized waveguide radiation array, which can radiate microwave signals to the space, and can receive microwave signals from the space. The satellite-borne K-band phased array antenna circularly-polarized waveguide radiation array is composed of a plurality of antenna units, wherein each antenna unit comprises a matching diaphragm, an SMP coaxial feed socket, a square waveguide radiator, a waveguide-to-coaxial adapter, an SMP feed socket feed end, an impedance matching device and a circular polarizer, and adopts an integral design; and the matching diaphragms are adopted among the antenna units for deploying coupling characteristics among radiating units, so as to achieve more ideal standing wave performance and radiation characteristics. The satellite-borne K-band phased array antenna circularly-polarized waveguide radiation array is simple and reliable in structure, has the advantages of two-directional plus / minus 40-degree wide angle scanning, low sweep gain drop and excellent circular polarization characteristics, and satisfies the requirements for an phased-array antenna of satellite-borne intersatellite and satellite-to-ground communication. The antenna adopts an aluminum structure, and performances of the antenna are not affected by factors such as elemental oxygen corrosion and ultraviolet radiation of the on-orbit space environment.

This is a membrance electrode process method for fuel cell or eletrolysis. The membrance electrode includes a structure of three-layer or five-layer. The three-layer structure is composed by cathode catalytic layer-polymer electrolyte membrance-anode catalytic layer. The process method is as: loading cathode and anode catalytic ink to the two sides of the polymer electrolyte membrance and dry in AC field. The five-layer structure is composed by cathode diffusing layer-cathode catalytic layer-polymer electrolyte membrance-anode catalytic layer-anode diffusing layer. The process method is as: loading cathode and anode catalytic ink to cathode and anode diffusing layer separately and dry in AC field; heat compressing the cathode and anode to the polymer electrolyte membrance.

The invention belongs to the technical field of lithium ion battery negative electrode materials, and in particular relates to a preparation method for a high-capacity porous spherical graphitized carbon negative electrode material. The preparation method comprises the following steps: injecting a precursor dispersion liquid into nano pores of a silicon dioxide colloidal crystal spherical template; carrying out ultrasonic immersing, high-temperature calcinations, template removal, filtering and drying to obtain the high-capacity porous spherical graphitized carbon negative electrode material; and further emulsifying a colloidal silicon dioxide aqueous solution to obtain nano silicon dioxide mixed emulsion; and carrying out constant-temperature condensation, water evaporation, self-assembly, washing and calcinations on the nano silicon dioxide mixed emulsion to obtain the silicon dioxide colloidal crystal spherical template. The invention further discloses the high-capacity porous spherical graphitized carbon negative electrode material prepared by the method. The high-capacity porous spherical graphitized carbon negative electrode material is suitable for manufacturing an electrode material, an electrode plate and the like, can increase charging and discharging capacity of a battery, and is suitable for large-current charging and discharging; and compaction density of the electrode plate is increased, rebound of the electrode plate is reduced, and service life of the battery is prolonged.

The invention belongs to the technical field of an electrode preparation method, and in particular relates to a preparation method of an ordered solid oxide membrane electrode. In the method, a supporter array solid oxide bar of a catalyst can be prepared by a template method, and can be roasted and integrally fused with a compact solid oxide electrolyte membrane. The highly ordered array solid oxide bar defines the electrode void ratio and the catalyst surface size in the ordered solid oxide membrane electrode, so as to realize the controllable preparation of the ordered electrode. An anode catalyst and a cathode catalyst are prepared respectively on the array solid oxide bar, the catalysts are combined on the surface of the solid oxide bar in a nano- or micro-particle state to form a catalysis layer, the catalyst particles are communicated with each other and are connected to a collector, and the catalyst particles are dispersed highly and have higher specific surface area and catalysis activity, therefore, the three-phase reaction interface of an SOFC (solid oxide fuel cell) and an SOEC (solid oxide electrolysis cells) is increased greatly, the polarization resistance of the electrode is reduced, and consequently, the reaction rate of the fuel and the raw material gas reducing transforming rate are improved.

The invention discloses a novel molten carbonate fuel cell structure which has the main characteristics of ordered separator and ordered electrode compared with conventional molten carbonate fuel cells. The molten carbonate fuel cell structure is characterized in that the employed separator and electrode both have an ordered tunnel structure, and because of the ordered tunnel structure owned by the fuel cell self, a long-time separator roasting process is not needed again in a starting process of the fuel cell, and the first starting time of the molten carbonate fuel cell is substantially reduced. Also, the ordered tunnel structures of the separator and the electrode of the fuel cell are beneficial for substance transmission of reactants and products, help to reduce mass transfer polarization, and are beneficial for improvement of cell properties.

The present invention provides a method of preparing a direct higher alcohol battery membrane electrode, characterized in that the method includes following steps: A. dispersing a catalyst and a first binder to a dispersant, obtaining slurry; B. heating the slurry 10 min-3 hours under 40-100 DEG C, then ultrasonic heating 10 mins-2hours, forming uniform slurry; C. coating the slurry on the support layer to form a membrane electrode. The method of the preparing direct higher alcohol battery membrane electrode of the invention is simple, and easy to operate, markedly improving the power density and the stability of the fuel battery by adjusting and controlling the aggregation state of the first binder. The membrane electrode of the invention effectively improves the catalytic activity and the efficiency of the electrode, improving the catalytic activity and the utilization ratio of the catalyst of the fuel battery membrane electrode, effectively improving the performance and the stability of the battery, reducing the polarization loss of the battery, so as to improve the performance of the fuel battery.

The invention provides an osmium-doped LiAlSiO4 coated lithium nickel cobalt manganate positive electrode material and a preparation method and application thereof. The positive electrode material comprises a base material and a coating layer, wherein the base material is osmium-doped lithium nickel cobalt manganate, the general formula of the base material is LiNiaCobMn<1-a-b>OsxO2, a is greaterthan or equal to 0.3 and less than or equal to 0.8, b is greater than or equal to 0.1 and less than or equal to 0.2, X is less than or equal to 0.01, and the coating layer is LiAlSiO4. The positive electrode material is osmium-doped LiAlSiO4-coated lithium nickel cobalt manganate. The material has the characteristics of high discharge capacity, good cycle performance, excellent rate capability, good processability and the like. The preparation method has the advantages of simple steps, easy operation, low cost and the like.

The invention discloses a double-feed type circularly polarized millimeter wave array antenna system which comprises a substrate, a millimeter wave array antenna arranged on the substrate and a first feeding unit and a second feeding unit connected with the millimeter wave array antenna, wherein the millimeter wave array antenna comprises a plurality of rectangular metallic pasters in square array distribution, the rectangular metallic pasters are connected through bar-shaped metallic strips, and the first feeding unit and the second feeding unit are positioned on the adjacent edges of the millimeter wave array antenna and are mutually perpendicular to each other. The double-feed type circularly polarized millimeter wave array antenna system can radiate circular polarized wave and electromagnetic wave, generates good wave beam forming, improves transmit-receive efficiency, and reduces polarization loss.

The invention discloses a radio station transmitting antenna, especially a transmitting antenna with a perpendicular depolarizing single dipole, comprising a strut body and multilayer antenna vibrators fixed onto the strut body, wherein each layer of the antenna vibrator is a single dipole vibrator, the two poles of which are distributed in a linear form from up to down and perpendicular to the ground, each layer of the antenna vibrator is fixedly connected to the sides of the strut body through stings, the multilayer antenna vibrators are distributed uniformly on the same side of the strut body from up to down, the strut body is a hollow metal pole with a certain taper, and is connected with two sections or more.

The invention provides an antenna structure and a mobile terminal. The antenna structure comprises a feed source and an antenna radiator, wherein the antenna radiator is connected to the feed source; the antenna radiator includes at least one first antenna radiation portion which is in an umbrella structure; the first antenna radiation portion which is in the umbrella structure includes an antenna receiving port; and the antenna receiving port is far away from the feed source. In the invention, through a structure design of the first antenna radiation portion which is in the umbrella structure in the antenna radiator, a polarization mode of an antenna approaches circular polarization, a circular polarization signal sent by a GNSS satellite can be effectively received and polarization losses are reduced. Simultaneously, the antenna receiving port of the first antenna radiation portion is far away from the feed source so that radiation directivity of the antenna mainly points to an upper hemisphere; and a gain of the upper hemisphere is increased and signal receiving efficiency is improved.

The nonvolatile SRAM unit comprises a 6T SRAM and a nonvolatile storage module, the nonvolatile storage module comprises a fifth NMOS (N-channel metal oxide semiconductor) tube, a sixth NMOS tube, a seventh NMOS tube, an eighth NMOS tube, a first hafnium-based ferroelectric capacitor and a second hafnium-based ferroelectric capacitor and is of a 4T2C structure, and in the nonvolatile storage module, the first hafnium-based ferroelectric capacitor is connected with the second hafnium-based ferroelectric capacitor. A pair of hafnium-based ferroelectric capacitors, namely a first hafnium-based ferroelectric capacitor and a second hafnium-based ferroelectric capacitor, is adopted as nonvolatile memory devices to form a complementary bilateral structure, data in a 6T SRAM (Static Random Access Memory) is stored in the first hafnium-based ferroelectric capacitor and the second hafnium-based ferroelectric capacitor before power failure, and then the circuit is completely turned off, so that the standby power consumption is saved, and the power consumption is reduced. A complementary bilateral structure formed by the first hafnium-based ferroelectric capacitor and the second hafnium-based ferroelectric capacitor can improve the data recovery rate and the reliability of resisting process change; the method has the advantages of being high in data recovery rate and good in reliability of resisting process changes.

A cross polarization antenna comprises a substrate, a first impedance converter, a second impedance converter, a first cross polarization antenna and a second cross polarization antenna, wherein the first opening of the first cross polarization antenna is corresponding to the second opening of the second cross polarization antenna, and can be spatially arranged crosswise without contacting with each other. The cross polarization antenna can effectively receive electromagnetic waves from various polarization directions to reduce polarization loss, and is fabricated integrally to achieve convenient fabrication and assembly and low fabrication cost.

The invention provides a single-crystal lithium nickel manganese cobalt positive electrode material. The single-crystal lithium nickel manganese cobalt positive electrode material comprises a substrate, wherein the substrate is a compound shown as a formula I of LiNi<x>Co<y>Mn<1-x-y>M<z>O<2>, x is more than or equal to 0.3 but less than or equal to 0.75, y is more than or equal to 0.2 but less than or equal to 0.3, z is more than or equal to 0 but less than or equal to 0.1, and a coating layer is coated on a surface of the substrate and is one or more of Li2ZrO3, Li2SnO3, LiNbO3, Li4Ti5O12 and LiAlO2. Compared with the prior art, a fast ion conductor is coated on the surface, thus, the rate performance of a single-crystal material is improved, the gram capacity of the single-crystal material is improved, the cycle performance of the material is further improved, the internal resistance can also be reduced, the polarization loss is reduced, and the cycle lifetime of a battery is prolonged; and meanwhile, the advantage of large compaction of a single-crystal ternary material is maintained, a particle broken phenomenon caused by rolling particles similar to secondary particles during battery fabrication can be prevented due to relatively high compaction, and the cycle performance is improved.

A cross-polarized antenna includes a substrate, a first impedance converter, a second impedance converter, a first cross-polarized antenna, and a second cross-polarized antenna. The first cross-polarized antenna has a first opening corresponding to a second opening in the second cross-polarized antenna, in which the two openings cross each other in space without contacting. The antenna is capable of receiving electromagnetic waves from different polarization directions effectively, thereby reducing the polarization loss. Besides, as the antenna is integrally formed, the manufacturing and assembling process thereof are simplified, thus lowering the manufacturing cost.

The invention relates to a preparation method of a functional porous graphene integrated electrode material and application of the functional porous graphene integrated electrode material in a vanadium battery. The method comprises the following steps: taking a bipolar plate as a working electrode, adopting a three-electrode system, taking an aqueous solution containing graphene oxide and lithiumperchlorate as a supporting electrolyte, carrying out electrochemical deposition for the first time to obtain a porous graphene / bipolar plate integrated electrode material, and carrying out immersioncleaning with deionized water; and taking the immersed porous graphene / bipolar plate integrated electrode material as a working electrode, adopting a three-electrode system, taking a solution containing functional components as a secondary electro-deposition electrolyte solution, carrying out secondary electrochemical deposition, and introducing the functional components into the surface of the porous graphene to obtain the functional porous graphene integrated electrode material. When the electrode material is applied to a vanadium battery electrode, the polarization loss of a vanadium battery in the operation process can be effectively reduced, the battery storage capacity is increased, and the battery performance is improved. The method is easy and convenient to operate, flexible in design, high in controllability, environmentally friendly, free of pollution and good in application prospect.

The invention provides a proton conduction type solid oxide electrolytic tank and a preparation method thereof, belongs to the technical field of solid oxide electrolytic tanks, and solves the problems of large polarization loss, overlong heating time and overhigh energy consumption in the prior art. The proton conduction type solid oxide electrolytic tank sequentially comprises a porous metal supporting layer (6), a cathode layer (5), an electrolyte layer (3) and an anode layer (1) from bottom to top. The porous metal supporting layer (6) is made of a stainless steel material with ferrite and cadmium as main components, and the porous area of the porous metal supporting layer (6) accounts for 60%-80% of the overlapping area of the porous metal supporting layer (6) and the cathode layer (5). The cathode layer (5) and the anode layer (1) are made of the same mixed material, and the main components of the material are Ni and BCZYZ; the electrolyte layer (3) is made of a material whose main component is BCZYZ. The electrolytic tank realizes the functions of multiple functions, low energy consumption and quick start.

An anion transport membrane is provided enabling efficient anion exchange across the membrane, which could be used in applications like fuel cells, water electrolyzers, or water filtration systems. The structural membrane morphology is based on a hydrophobic polysulfone membrane backbone and co-grafted thereon hydrophilic poly(ethylene glycol) grafts and anion conducting quaternary ammonium species. This structure defines a bi-continuous morphology with locally phase-separated hydrophobic-hydrophilic domains, and a co-localization of the anion conducting quaternary ammonium species with respect to the hydrophilic poly(ethylene glycol) grafts enabling efficient and continuous ion transport channels for facilitating anion transport.

The invention belongs to the field of preparation of lithium ion battery materials, and particularly relates to a preparation method of a strontium titanate modified nickel cobalt lithium manganate positive electrode material, the prepared positive electrode material and a lithium ion battery containing the positive electrode material. The positive electrode material is a rare earth element doped strontium titanate modified nickel cobalt lithium manganate positive electrode material doped with large and small particles. The preparation method has the advantages that rare earth element doped strontium titanate modification and large and small particle mixing are adopted, requirements on a precursor is not high, the prepared precursor is wide in particle size distribution, a large and small particle mixed ternary material can be formed in a later period, ammonia water does not need to serve as a complexing agent in the preparation method, harm of ammonia water serving as a complexing agent to the safety and health of workers is avoided, and the treatment cost of wastewater is reduced.

The invention provides a mixed conduction type solid oxide electrolytic tank and a preparation method thereof, belongs to the technical field of solid oxide electrolytic tanks, and solves the problems of large polarization loss, overlong heating time and overhigh energy consumption in the prior art. The electrolytic tank sequentially comprises a porous metal supporting layer (6), a cathode layer (5), an electrolyte layer (3) and an anode layer (1) from bottom to top. The porous metal supporting layer (6) is made of a stainless steel material of which the main components are ferrite and cadmium; the cathode layer (5) is made of a mixed material of which the main components are Ni and BZCYYb; the electrolyte layer (3) is made of a material of which the main component is BZCYYb; and the anode layer (1) is made of a mixed material of which the main components are NBSCF and BZCYYb. The electrolytic tank has the functions of low energy consumption and quick start.

A high-power ring-shaped energy storage battery, including several layers of ring-shaped walls made of solid electrolyte coaxially set together, the two ends of the ring-shaped wall are respectively fixed on the insulating circular base and the circular upper cover, all the ring-shaped walls Together with the circular base and the circular upper cover, several layers of airtight chambers are enclosed together. The adjacent airtight chambers are filled with positive electrode materials or negative electrode materials at intervals. When the battery is running, the positive and negative electrode materials are both in liquid state; The bottom of the body draws out the positive and negative current lead-out poles respectively and gathers them to form the positive and negative poles of the battery. The battery provided by the invention has a large electrochemical reaction area and a current flow area, has excellent electronic conductivity, can reach a sufficiently large current density, and ensures a sufficiently high charge and discharge rate and power, and has a simple structure and low cost. It is cheap, can determine size parameters according to different capacity requirements, is easy to expand in scale, and can meet different capacity and space requirements.

The invention relates to a multi-channel wireless signal transceiver, and the transceiver comprises a high-gain antenna device, an antenna switch device, a signal processing device and a controller; the high-gain antenna device comprises a substrate and two or more than two three-dimensional antennas, and the three-dimensional antennas comprise dual-polarization yagi antennas and / or dual-polarization log-periodic antennas. Each dual-polarization yagi antenna comprises an antenna axial rod, a dual-polarization reflector, a dual-polarization active oscillator and a dual-polarization director, and the dual-polarization log-periodic antenna comprises an antenna body composed of four assembly lines, a feed coaxial line tightly attached to the assembly lines and a plurality of antenna oscillators which are alternately arranged on the assembly lines in parallel at equal intervals. Meanwhile, the feed coaxial line passes through the through hole in the assembly line and is connected to the other assembly line opposite to the assembly line. The high-gain antenna device is designed into a three-dimensional structure, so that the overall gain of the antenna is improved, and the use reliability of the multi-channel wireless signal transceiver is improved.