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.

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 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 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 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-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.

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.

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.