744results about How to "Reduce current density" patented technology

A preparation method for a metallic aluminum super-hydrophobic surface is disclosed, relating to the treatment of metal surface. A preparation method for the metallic aluminum super-hydrophobic surface is provided. Cleaning of an aluminum sheet comprises cleaning and then air-drying the aluminum sheet to obtain the cleaned and air-dried aluminum sheet for future use; chemical corrosion comprises removing an oxide layer on the surface of the cleaned and air-dried aluminum sheet and then immersing the aluminum sheet in a HCl solution for corrosion or in a NaOH solution; electrochemical corrosion comprises regarding the chemically-corroded aluminum sheet as an anode and regarding a platinum sheet or a titanium net as an cathode, arranging in parallel the anode and the cathode in face of each other, and implementing one-step anodic oxidation in a constant-current mode; fluorosilane modification comprises immersing the electrochemically-corroded aluminum sheet in a fluorosilane alcohol solution for the modification and the drying to result in the metallic aluminum super-hydrophobic surface. Compared with the use of the chemical method or the electrochemical method only, the two-step method integrates the advantages of the chemical method and the electrochemical method, the required processing time is shorter, the apparatuses are so simpler as to be beneficial for large-scale production, and the invention can be used for the preparation of the super-hydrophobic surface of other metals.

The invention relates to an energy-saving drive circuit of a motor, and aims to provide a super capacitor-based energy-saving drive circuit of a motor and a control method. The main circuit of the circuit consists of a super capacitor bank, a super capacitor charge/discharge management circuit, a controllable rectifying circuit, a controllable rectifying control circuit and the like. Impact to a power grid when an elevator runs is reduced by optimized control of the controllable rectifying circuit and the super capacitor charge/discharge circuit and absorption of running power peak of the elevator, the controllable rectifying circuit bears the smooth part of the electric and generating power of the motor and has emergency power supply function after the elevator is cut off electricity, and the super capacitor and a DC bus form through connection in a normal state to achieve high efficiency. The drive circuit has the advantages of compact line and high integral work efficiency, the service life of the super capacitor is prolonged, and the integral technical and economic performance of the energy feedback elevator is improved. The drive circuit is particularly suitable for driving the energy feedback energy-saving elevator, and is also suitable for motor energy-saving drive situations of a crane and the like.

The invention discloses a metal lithium negative electrode piece, a preparation method thereof and a metal lithium secondary battery. The metal lithium negative electrode piece comprises a current collector, wherein a metal lithium layer is formed on the current collector; a composite conductive film is formed on the metal lithium layer. The preparation method of the metal lithium negative electrode piece comprises the following steps: laminating a metal lithium foil and the current collector together, or plating lithium metal on the surface of the current collector; dissolving a polymer electrolyte in a solvent to prepare a polymer electrolyte solution; adding a conductive agent into the polymer electrolyte solution; stirring uniformly and then coating a mixed solution on the metal lithium layer; after evaporating the solvent, forming the composite conductive film on the surface of the metal lithium layer to obtain the metal lithium negative electrode piece; or, coating the mixed solution on a substrate and evaporating the solvent to obtain the composite conductive film, laminating the composite conductive film on the surface of the metal lithium layer to form the composite conductive film and obtain the metal lithium negative electrode piece. The metal lithium negative electrode piece provided by the invention can inhibit lithium dendrites, prevent batteries from being short-circuited, and improve safety performance and cycling performance of lithium batteries.

A high power high temperature superconductive circuit for use in various microwave devices including filters, dielectric resonator filters, multiplexers, transmission lines, delay lines, hybrids and beam-forming networks has thin gold films deposited either on a substrate or on top of the high temperature superconductive film. Alternatively, other metal films can be used or a plurality of dielectric films can be used or a dielectric constant gradient substrate can be used. The use of these materials in a part or parts of a microwave circuit reduces the current density in those parts compared to the level of current density if only high temperature superconductive film is used. This increases the power handling capability of the circuit.

The invention provides a pixel circuit and a driving method, an organic light-emitting diode (OLED) display panel and a device thereof. The pixel circuit comprises a plurality of rows of pixel units. Each row of pixel units comprises a plurality of sub pixel units and further comprises an auxiliary compensation circuit. Each auxiliary compensation circuit generates a switch control signal input into a sub pixel driving circuit included by the corresponding sub pixel units according to a scanning signal from a gate drive circuit and generates a compensation control signal input to the sub pixel driving circuit according to a control signal from the gate drive circuit, and the sub pixel driving circuit receives data voltage from a data line according to the switch control signal, controls the OLED to emit light according to the data voltage through a driving transistor included by the sub pixel driving circuit, and controls and compensates threshold voltage of the driving transistor according to the compensation control signal when the driving transistor drives the OLED to emit light. By means of the pixel circuit, the driving method, the OLED display panel and the device, the pixel circuit design is simplified, the pixel opening rate is increased, the service life of the OLED panel is prolonged, and the cost is reduced.

A superconducting nanowire photon detector apparatus comprising detection, insulating, and substrate layers. The insulating layer provides electrical isolation of a plurality of individual detector elements from the interconnection network fabricated on the substrate layer except where electrical interconnection between the inputs and outputs of each detector element and the interconnection network is intended.

The invention discloses a preparation method of a soft/hard carbon modified anode material for lithium ion batteries. The method comprises the following steps: (1) carrying out mixed granulation; (2)screening and crushing; (3) mixing; (4) treating at high temperature; (5) screening; (6) modifying; (7) carrying out secondary carbonization. The method is characterized in that a soft carbon precursor and a hard carbon precursor are both used as binding agents, kneading and granulating are carried out at a certain temperature and under other conditions, small graphite particles are polymerized soas to enable the internal structure to be further densified and increase the volume density, high-temperature graphitization is then performed, and asphalt and resin are converted to pyrolytic carbon, so that a soft/hard carbon graphite composite systems is formed; the surface of the modified soft/hard carbon composite anode material is evenly coated with a layer of Ti3SiC2, having good electrical conductivity and stable chemical properties, and a conductive network, so that the improvement of the discharge capacity, discharge efficiency and cycling stability of the graphite anode material isbetter promoted.

The invention discloses a nitrogen and sulfur co-doped carbon-loaded non-noble metal type oxygen reduction catalyst and a preparation method thereof and discloses a M-N-S-C oxygen reduction catalyst and a preparation method thereof. The raw materials of the catalyst comprise copolymer P (TPT+Tp) of tripyrrole-[1,3,5]-triazine (TPT) and thiophene (Tp) and non-noble metal salt. The preparation method of the catalyst includes the following steps that firstly, a Friedel-Crafts reaction is adopted for synthesizing the copolymer P (TPT+Tp) of the tripyrrole-[1,3,5]-triazine (TPT) and the thiophene (Tp); secondly, the P (TPT+Tp) and the non-noble metal salt are added into ethanol, mixtures are placed in an ultrasonic dispersing instrument, a whole system is evenly dispersed due to ultrasound, and then the ethanol is dried by distillation and placed in a vacuum drying box to be dried for 4 h at the temperature of 80 DEG C; thirdly, thermal treatment is performed for the first time and nitrogen doped materials are obtained; fourthly, the nitrogen doped materials are completely washed through dilute acid; fifthly, thermal treatment is performed for the second time, and then the M-N-C oxygen reduction catalyst can be obtained.

An improved apparatus and method of producing metal foam is provided which involves optimizing the natural convection of electrolyte through a foam being electroplated by inclining the foam during plating. A diagonal flow of electrolyte though the foam enhances electrolyte turnover within the foam while increasing electroplating efficiency. Further increases in plating efficiency are provided by shifting current density from higher plating zones to lower plating zones.

The invention discloses an M-N-C oxygen reduction catalyst and a preparation method thereof, wherein the raw materials of the catalyst comprise a copolymer (P(TPT+Py)) of tripyrrole-[1,3,5]-triazine (TPT) and pyrrole (Py) and a non-noble metal salt. The preparation method comprises: (1) using a Friedel-Crafts reaction to synthesize a copolymer (P(TPT+Py)) of tripyrrole-[1,3,5]-triazine (TPT) and pyrrole (Py); (2) adding (P(TPT+Py)) and a non-noble metal salt to ethanol, placing into an ultrasonic dispersion device, carrying out an ultrasonic treatment to make the whole system be uniformly dispersed, evaporating the ethanol, placing into a vacuum oven, and drying for 4 h at a temperature of 80 DEG C; (3) carrying out a first heat treatment to obtain a nitrogen-doped carbon material; (4) completely washing the obtained nitrogen-doped carbon material with a diluted acid; and (5) carrying out a second heat treatment so as to obtain the M-N-C oxygen reduction catalyst.

A locating system of oxidation/reduction potential of the electrolysis water and the constant output method of calibration and compensation thereof are disclosed. Thus, the voltage of the electrolytic bath can be regulated so as to control an electrolytic current of the electrolytic bath exactly, so that the electrolytic current of the electrolytic bath is maintained at a constant value.

A unipolar semiconductor laser is provided in which an active region is sandwiched in a guiding structure between an upper and lower cladding layer, the lower cladding layer being situated on a semiconducting substrate. The unipolar semiconductor laser comprises a raised ridge section running from end to end between end mirrors defining the laser cavity. The ridge section aids in optical and electrical confinement. The ridge waveguide is divided in a plurality of cavity segments (at least two). Lattice structures can be arranged to these cavity segments. Each cavity segment is in contact with upper metallic electrodes. A metallic electrode coupled to the bottom surface of the semiconducting substrate facilitates current injection through the device.

The invention provides a circuit board connector and communication equipment, belonging to the technical field of communication. The circuit board connector comprises an outer conductor, an inner conductor and a connecting piece, wherein the outer conductor is in a metal cylindrical structure; the inner conductor is a cylindrical metal body, and is independent of the outer conductor and arranged in the outer conductor; an insulating medium is filled between the inner conductor and the outer conductor; and two ends of the inner conductor are connected with the connecting piece of the circuit board respectively. The connector has simple structure, no complicated mechanical structure and low material cost; and the outer conductor can be shared with a structure piece, and the structure piece is manufactured by a die sinking method without increasing additional cost.

The invention relates to a rare-earth ferroalloy for producing a rare-earth permanent magnetism material with high performance and a preparation process thereof. The ferroalloy comprises the contents according to the weight percentage: 30-90 of neodymium or didymium rare earth, and the balance ferrum and less than 1 of unavoidable impurities, wherein the O content is less than or equal to 0.1, the C content is less than or equal to 0.1 and the N content is less than or equal to 0.05. The alloy is prepared by an electrolytic method of fluoride molten salt system oxide, and an electrolyte of the alloy comprises rare-earth fluoride and lithium fluoride.

The invention discloses a zinc oxide-metal lithium composite negative electrode and a preparation method thereof, and a metal lithium secondary battery. The zinc oxide-metal lithium composite negativeelectrode has a three-dimensional structure and comprises foamy copper and metal lithium and zinc oxide compounded in the foamy copper. The negative electrode utilizes combination of foamy copper andmetal lithium, utilizes three-dimensional foamy copper as a skeleton, utilizes a hydrothermal method to deposit a layer of a zinc oxide nano-layer on the foamy copper surface, and utilizes the lithium loving performances of the zinc oxide nano-layer to melt the solid lithium metal into liquid lithium spontaneously adsorbed into the three-dimensional foamy copper skeleton. Compared with the lithium sheet negative electrode, the three-dimensional metal lithium negative electrode has a large specific surface area and can effectively reduce the current density during charging and discharging. Theporous structure can well limit lithium in the internal space, reduce the volume expansion of the lithium negative electrode during charging and discharging, and effectively inhibit the growth of dendrites.

The invention provides positive electrode material Fe<x>Co<1-x>S<2> powder of a thermal battery and preparation method for the powder. In the Fe<x>Co<1-x>S<2> powder, x is greater than 0 and less than 1. The positive electrode material Fe<x>Co<1-x>S<2> powder of the thermal battery is prepared by combination of advantages of two kinds of positive electrode materials of CoS<2> and FeS<2> by a method in combination of chemical deposition and high-temperature solid-phase reaction. The positive electrode material Fe<x>Co<1-x>S<2> powder of the thermal battery has the advantages of high capacity and high voltage platform of the FeS<2>, as well as the advantages of low electrical resistivity and thermal stability of CoS<2>, and is a novel positive electrode material of the thermal battery.

The invention discloses a lithium metal composite negative electrode with a lithium-philic and lithium-phobic gradient structure, and a preparation method thereof. The lithium metal composite negativeelectrode is of a three-layer structure, wherein the bottom layer is a 3D porous matrix framework, the middle layer is a lithium-philic layer compounded on the 3D porous matrix framework, and the toplayer is a lithium-phobic layer compounded on the surface of the lithium-philic layer. The preparation method comprises the following steps: (1) preparing a 3D porous matrix skeleton, and cleaning; (2) transferring the 3D porous matrix skeleton to a prepared precursor solution; (3) forming a lithium-philic layer on the 3D porous matrix skeleton in situ by adopting a solvothermal method; (4) modifying a lithium-phobic layer on the lithium-philic layer; and (5) finally filling with lithium by adopting an electro-deposition method. According to the invention, the overpotential in the lithium metal nucleation and deposition process can be reduced by utilizing the lithium-philic layer, and the uniform deposition and dissolution of the lithium metal in the continuous cycle process are realizedby utilizing the characteristic that the lithium ion diffusion is promoted by utilizing the lithium-phobic layer, so that the growth of dendritic crystals is effectively avoided, and the cycle life ofthe lithium metal battery is greatly prolonged.

The invention discloses a lithium-dissimilar metal composite negative electrode material and a preparation method thereof, and belongs to the technical field of battery negative electrode materials. The method includes the following steps of: firstly, heating metal lithium to 200-800DEG C to ensure that the metal lithium is in a molten state; then, adding dissimilar metal to the metal lithium in the molten state, performing heat preservation for 5-60min, and uniformly mixing to form a molten alloy; and finally, cooling the molten alloy to room temperature to obtain the lithium-dissimilar metalcomposite negative electrode material. The material contains a metal lithium elemental phase, and when the material is used as a negative electrode material of a lithium battery, the metal lithium elemental phase acts as a lithium source. The lithium-dissimilar metal composite negative electrode material and the preparation method thereof provided by the invention are simple and feasible and havelow costs, and when the negative electrode material is applied in the lithium battery, the coulombic efficiency and cycle life of the battery can be effectively improved.