114results about How to "Improve voltage efficiency" patented technology

An integrated circuit device comprises a memory cell well formed with a flash memory device, first and second well of opposite conductivity types for formation of high voltage transistors, and third and fourth wells of opposite conductivity types for low voltage transistors, wherein at least one of the fist and second wells and at least one of the third and fourth wells have an impurity distribution profile steeper than the memory cell well.

The present disclosure relates to solid oxide fuel cells (SOFCs) exploiting gas separation devices in which a first gas mixture including components A (for example hydrogen) and B (for example carbon dioxide) is to be separated so that a first product of the separation is enriched in component A, while component B is mixed with a third gas component C (for example air, oxygen-enriched air or oxygen-depleted air) contained in a displacement purge stream to form a second gas mixture including components B and C, and with provision to prevent cross contamination of component C into the first product containing component A, or of component A into the second gas mixture containing component C. The invention may be applied to hydrogen (component A) enrichment from fuel cell anode exhaust, where dilute carbon dioxide (component B) is to be rejected such as to the atmosphere by purging with cathode exhaust oxygen-depleted air (as component C).

The invention relates to a bipolar plate for a liquid flow energy storage battery and a preparation method. The bipolar plate employs a carbon plastic composite plate with a thickness of 0.5-5mm as a matrix material. Conducting layers with a thickness of 1-1000 microns are coated on the surface of one side or surfaces of two sides of the matrix. The bipolar plate combines advantages of the carbon plastic composite plate and a graphite plate, decreases the contact resistance between an electrode and the bipolar plate, and finally decreases the Ohm internal resistance of the liquid flow energy storage battery. The bipolar plate raises the energy efficiency and the voltage efficiency of the liquid flow energy storage battery, and therefore the working current density is increased, thus weight, volume and cost of a battery with the same output power are all decreased.

An organic light-emitting device includes a first electrode; a second electrode; an emissive layer disposed between the first electrode and the second electrode; a first hole injection layer disposed between the first electrode and the emissive layer; a second hole injection layer disposed between the first electrode and the emissive layer; and an electron transport layer disposed between the emissive layer and the second electrode. The first hole injection layer includes a metal fluoride and a first hole injecting material. The second hole injection layer includes a molybdenum oxide and a second hole injecting material. The electron transport layer includes an electron transporting material and a metal oxide. The metal oxide may be one of lithium oxide (Li2O), molybdenum oxide (MoO3), barium oxide (BaO), and boron oxide (B2O3).

The invention provides a flow battery integrating device which comprises a negative electrode flow frame, a negative electrode, a proton exchange membrane, a positive electrode and a positive electrode flow frame which are sequentially connected with each other. The proton exchange membrane and the flow frames are spliced by acid-resistant binding agent, and the positive electrode and the proton exchange membrane, and the negative electrode and the proton exchange membrane are splice by conductive adhesive. Because the proton exchange membrane, and the flow frames and the electrodes on both sides are integrated in a bonding method, the invention simplifies the battery assembling process and enhances the tightness of the battery, and meanwhile, the integrating device reduces contact resistance between the membrane and the electrodes due to the integration of the membrane and the electrodes so as to reduce the internal resistance of the battery and enhance the efficiency of the battery.

The invention provides a mono-trapezoid flow battery, a poly-trapezoid flow battery and an electric pile thereof. Both a cathode porous electrode and an anode porous electrode in the mono-trapezoid flow battery are trapezoidal plate electrodes and are respectively arranged inside a cathode electrolyte flow frame and an anode electrolyte flow frame. On the cathode electrolyte flow frame and the anode electrolyte flow frame, two electrolyte inlet flow paths are arranged nearby the lower bottom edges respectively of the cathode porous electrode and the anode porous electrode, and two electrolyte outlet flow paths are arranged nearby the upper bottom edges respectively of the cathode porous electrode and the anode porous electrode. The electrolyte flows into the cathode porous electrode through the lower bottom edges of the cathode porous electrode and the anode porous electrode and then flows out from the upper bottom edges of the cathode porous electrode and the anode porous electrode. The trapezoid flow battery is reduced in concentration polarization at certain degree and further is reduced in voltage loss, and meanwhile, is improved in utilization efficiency of the electrolyte and is increased in total efficiency.

The present invention describes an improved membrane for Redox Flow Batteries, in particular for Vanadium Redox Batteries and energy storage systems and applications employing the Vanadium Redox Cells and Batteries. Redox Flow Batteries involve the use of two redox couple electrolytes separated by an ion exchange membrane that is the most important cell component.

A multi-chip module (MCM) for power supply circuitry integrates a controller, a driver and two power MOSFETs in a single chip to shorten the signal path between the controller and the driver. When applied to a voltage regulator, the MCM shortens the feedback paths between the current sensors and the controller, so as to reduce the loss of and interference with the feedback signals, thereby improving the efficiency of the voltage regulator and simplifying the PCB traces routing.

The invention belongs to the technical field of electrode material surface treatment and especially relates to a modified electrode for a full-vanadium flow battery and a preparation method thereof. A carbon paper or a carbon felt is used as a modified electrode base material. An antimonic stannic oxide nanometer particle is attached to the surface of the carbon paper or the carbon felt fiber. The preparation method for the modified electrode is characterized by comprising the following steps: utilizing stannic chloride, antimony chloride and isopropyl alcohol to prepare a precursor solution; stirring for 30min at 80 DEG C and ageing for 24h; soaking the carbon paper or the carbon felt into the solution; adopting a pulling method for attaching the nanometer particle from the related solution to the surface of the carbon paper or the carbon felt fiber; drying at 80-150 DEG C; and finally, putting the dried carbon paper into a tube furnace, and calcining for 90min at 450-550 DEG C, thereby completing the preparation of the modified electrode. The invention provides the modified electrode which has a simple structure and is convenient in preparation method. After the modified electrode is applied to the full-vanadium flow battery, the problems of insufficient anode activity and oxygen evolution side reaction of the full-vanadium flow battery can be solved.

The invention discloses an electrode of a vanadium redox flow battery. The electrode is obtained by depositing a nano-carbon-based electrode material in a current collector, wherein the electrode comprises 0.1-10 of the nano-carbon-based electrode material in percentage by weight; the nano-carbon-based electrode material has the thickness of 1-200 mu m; the surface of the nano-carbon-based material comprises oxygen functional groups; the nano-carbon-based electrode material comprises a conductive agent and a bonding agent; the electrode material is deposited on the current collector to serve as an anode; a graphite electrode serves as a cathode; a Nafion117 film serves as a diaphragm; by charging and discharging in 2M vanadium ion electrolyte, under the same test condition, the voltage efficiency is improved by nearly 15 percent compared with the voltage efficiency of the battery which takes a common carbon electrode as the a; and the electrode with high performance is provided for the field of vanadium redox flow battery manufacturing.

The invention, relating to the field of battery production and energy storage, discloses a surface modification treatment method for increasing the activity of vanadium battery electrode materials, comprising the following steps: immersing a graphite-felt or carbon-felt material in a dispersion liquid of multi-walled carbon nanotubes for soaking, then cleaning, drying to obtain a modified graphite-felt or carbon-felt electrode material. According to the invention, mild and controllable surface modification treatment on the electrodes is carried out by using the multi-walled carbon nanotubes, the disadvantages of stability reduction of electrode materials and battery life shortening caused by peroxidation of the materials due to heat treatment and acid treatment are overcome, the technology is simple, and the cost is low. According to the invent, the graphite-felt or carbon-felt treated by the method as electrodes, a cation-exchange membrane as a separator, and positive and negative electrolytes which both consist of 1.5 M vanadyl sulfate and 2 M sulfuric acid form a battery, and the current efficiency, voltage efficiency, and energy efficiency of the battery are all obviously improved.

The invention relates to the field of alkaline redox flow battery energy storage, in particular to a preparation method of an ion exchange membrane for an alkaline redox flow battery, which is mainlyused for solving the problem of the high price of a Nafion diaphragm in the alkaline redox flow battery at the present stage, so that the cost of the redox flow battery is greatly reduced. An alkalineaqueous solution of ferricyanide (such as Na3[Fe(CN)6], K3[Fe(CN)6], (NH4)3[Fe(CN)6] and the like) is used as a positive electrolyte, and a strong alkaline solution (such as KOH, NaOH and the like) is used as a negative electrolyte; graphite felt and carbon felt are selected as positive electrode materials, and a zinc plate is selected as a negative electrode material; and the ionized sulfonatedpolyether ether ketone (SPEEK) diaphragm is used as an ion exchange membrane to assemble the battery. Therefore, the alkaline redox flow battery system with low cost and high performance is obtained.The flow battery system provided by the invention has the advantages of the high open-circuit voltage, the low cost, the high efficiency, the good cycling stability, safety, reliability and the like,and has a wide application prospect.

This invention relates to an electrode used in V oxide liquid flow battery, which takes a metal foil / net as the collector deposited with Ir, Ta, Mg, Co, Ag, Ru, Mn and Fe on the surface. The electrode has high mechanical strength, high non-corrodibility against strong acid and keeps high electrochemical activation. When it has the same thickness with that of carbon conduction plastics, or even thinner, it has even better tensile strength and bending strength, suitable for increasing the volume ratio energy of the battery. Charge, discharge experiment in 2M V electrolyte is carried out taking this invented electrode as the positive, graphite electrode as the negative, N-115 Nafion as the membranes when the current density is set, the voltage efficiency is increased by 10% to that of carbon electrodes.

A direct-current stabilized power supply device that drops a voltage from a power supply of a solar cell in which output power is unstable, and supplies a stable voltage necessary for measurement equipment and the like.

A device is described for charging an electrical energy storage device, which has an active current-limiting device in a main current path in order to limit a supply current to a predefined maximum current. A voltage transformer device is situated downstream from the current-limiting device for raising the potential of the electrical energy storage device over a supply potential.

Provided is a novel electronic device that comprises graphite, graphene or the like.An electronic device having a substrate, a layer comprising a 6-member ring-structured carbon homologue as the main ingredient, a pair of electrodes, a layer comprising aluminium oxide as the main ingredient and disposed between the pair of electrodes, and a layer comprising aluminium as the main ingredient, wherein the layer comprising aluminium oxide as the main ingredient is disposed between the layer comprising a 6-member ring-structured carbon homologue as the main ingredient and the layer comprising aluminium as the main ingredient so as to be in contact with the two layers.

An OLED device comprises a cathode, an anode, and has therebetween a light emitting layer (LEL), at least one layer between the cathode and anode comprising a carbocyclic 2-aryl-9,10-biphenylanthracene compound containing a total of 8-12 aromatic rings, wherein the 6-substituent is hydrogen or an alkyl group and the 2-substituent is: (A) an unsubstituted phenyl group; (B) a phenyl group substituted with (a) a fluoro, a cyano, or an alkyl group or (b) a m- or p-phenyl group; or (C) a substituted or unsubstituted fused ring aromatic group.

A drive for motor that can be operated up to a high load while improving efficiency of an inverter is provided. The drive for a motor includes: a voltage conversion circuit 2 that changes a value of a DC voltage and outputs the DC voltage; an inverter 3 that converts the DC voltage output from the voltage conversion circuit into an AC voltage, the conversion being performed by a switching operation of a switching element; and control means that controls the DC voltage output from the voltage conversion circuit and controls a voltage output from the inverter by the switching element so as to drive the motor 1. The control means executes DC voltage adjustment control in which the DC voltage output from the voltage conversion circuit is controlled based on a modulation factor of the DC voltage modulated by the inverter so that the modulation factor becomes closer to 1.

The invention discloses a porous electrode, a liquid flow battery with the same, a liquid flow battery stack and a liquid flow battery system. A flow guide channel through which an electrolyte solution flows is formed in the porous electrode, and the flow guide channel penetrates in the thickness direction of the porous electrode. The invention has the advantages that the flow guide channel through which the electrolyte solution flows is formed in the porous electrode, liquid flow resistance of the porous electrode on flowing of the electrolyte solution is reduced under the flow guide action of the flow guide channel on the electrolyte solution, and liquid flow pressure difference which is required by flowing of the electrolyte solution is effectively reduced; and moreover, when flowing in the flow guide channel, the electrolyte solution uniformly permeates through the porous electrodes at two sides of the flow guide channel, the uniformity of flowing of liquid flow is improved, concentration polarization caused by non-uniform flowing of the electrolyte solution is reduced, and the voltage efficiency of the liquid flow battery system is improved.

The invention provides a method for modifying a carbon porous material, characterized in that by applying a high pressure pulse voltage on two opposite plate electrodes and inserting an electrolyte plate which has a high dielectric constant and a compact structure and has an area that is slightly larger than the size of the plate electrodes between the two opposite plate electrodes, a uniform discharge plasma reaction zone is formed between the plate electrodes; mixed gasses containing oxygen are uniformly mixed at normal temperatures and pressures, the mixed gasses are subject to ionization activation by the plasma reaction zone to generate a plurality of oxygen-containing plasma gasses, after gas distribution is carried out, the gasses vertically flow through a pre-cleaned carbon porous material in the thickness direction to react to obtain the activated carbon porous material. The method has the advantages of environmental protection, low cost, mild treatment conditions, easy control of function group quantity, and outstanding improvement of the activity of the electrode material, and the method can realize gradient treatment, can reduce the area resistance of the contacting surface of the porous material and the bipolar plate, so as to increase the battery efficiency. The method uses devices, thus the method is easy for industrialized operation.

The invention discloses a method for preparing a highly conductive multi-layered composite plate, which is a carbon plastic conductive composite plate formed by directly fusing and mixing polymer matrix and conductive stuffing in a certain mass ratio and by a multi-layer coextrusion or laminating process, and the resistance of the prepared highly conductive multi-layered composite plate is generally less than 0.5 omega.cm. The types and ratios of the polymer matrix and the conductive stuffing of each layer can be individually designed according o the requirements on conductivity, mechanical property, thickness and the like, the composite can be designed and prepared according to the requirement on the mechanical performance of a battery and the requirement on assembly, and a thin conducting plate can be prepared to fulfill the aim of improving the voltage efficiency of the battery. When the method is used, some structural design of the surface of the highly conductive multi-layered composite can also be performed simply and conveniently to meet the particular demands for application in the field of energy storage.

The invention discloses a method for chemically plating Ni-W-P on a carbon felt electrode material of a modified redox flow battery. The method comprises the steps of carrying out cleaning and impurity removal on a PAN (Polyacrylonitrile) carbon fiber felt material; preparing a roughening solution from nitric Acid and sulfate, and soaking the PAN carbon fiber felt material in the roughening solution for increasing the surface area of the PAN carbon fiber felt material; preparing a sensitized-activated solution, and soaking the PAN carbon fiber felt material in the sensitized-activated solution; soaking the PAN carbon fiber felt material after sensitization-activation treatment in deionized water, and cleaning to be neutral; drying; chemically plating the dried PAN carbon fiber felt material in a plating solution to enable the surface to be plated with a uniform Ni-W-P alloy layer; cleaning the plated PAN carbon fiber felt material in the deionized water to be neutral; and drying for 8-10h at the temperature of 100-200 DEG C. The method for chemically plating Ni-W-P on the carbon felt electrode material of the modified redox flow battery is simple and feasible, is easy to operate and is low in the cost; with the adoption of the method, the whole performance, including the energy efficiency, the coulombic efficiency and the voltage efficiency, of the Fe / Cr redox flow battery are all improved by about 5 percent.

A spring modulation is proposed to regulate the output voltage of a voltage regulator. The spring modulation comprises a differential amplifier to generate a pair of voltage signal and current signal varied with the difference between a reference signal and a feedback signal related to the output voltage, and a PWM generator to generate a PWM signal in response to the pair of voltage signal and current signal to regulate the output voltage, in such a manner that, in load transient, the greater the difference between the feedback signal and reference signal is, the greater the on-time duty-cycle of the PWM signal is.

The invention relates to the field of the manufacture of vanadium batteries, in particular to a novel bipolar plate for a vanadium battery and a preparation method of the novel bipolar plate and solves the problems of great physical internal resistance, low voltage efficiency, uneven voltage of a single piece and the like of the battery in the prior art. The bipolar plate disclosed by the invention consists of four parts, namely a carbon material, a grid-shaped two-side through-hole resin plate, a conductive filler and a carbon material. The grid-shaped two-side through-hole resin plate and the conductive filler are used as a framework layer to be firstly manufactured into a low conductive plastic plate through a hot-press method. Then, the composite carbon materials on both sides of the low conductive plastic plate are subjected to hot press molding again so as to obtain the novel high conductive bipolar plate for the vanadium battery. According to the working requirements of the vanadium battery, for most of the existing bipolar plates, the process of using multiple steps of mixing or stirring and the like is simplified, the preparation process is simple, and only the production device namely a hot press is adopted to complete processing. The bipolar plate disclosed by the invention has high electric conductivity, the contact resistance between electrodes and the bipolar plate is very little, the physical internal resistance of the vanadium battery can be greatly reduced, the energy capacity of the vanadium battery can be increased, and therefore, the cost of the vanadium battery is reduced.

An organic-inorganic composite anion exchange membrane for non-aqueous redox flow batteries, which contains a polyvinylidene fluoride polymer, and a method for preparing the same are disclosed.

The invention provides a voltage compensation device, a voltage compensation method and a display device. The voltage compensation device comprises a heat-sensitive sensor group, a processor and a power management module, wherein the heat-sensitive sensor group and the power management module are electrically connected with the processor, and the heat-sensitive sensor group is arranged at a position corresponding to a pixel unit. By cooperative work of the heat-sensitive sensor group, the processor and the power management module, the power management module is controlled to output data voltage compensated by the pixel unit based on temperature information corresponding to the pixel unit and detected by the heat-sensitive sensor group, so that the pixel unit reaches reference pixel voltage. Compared with a method for compensating voltage by sensing electrical or optical characteristics of pixels through equipment in the prior art, time consumed for detecting the temperature informationcorresponding to the pixel unit is less, the voltage compensation efficiency of the pixel unit is high, the cost of the heat-sensitive sensor group is lower than that of the pixel sensing equipment,and large-area production can be realized.

The invention relates to a method and a device for removing heavy metal ions in wastewater by virtue of photoelectrocatalysis. According to the method, a metal material is used as a photo-anode, an organic substance contained in a reaction solution is used as a reducing agent, the organic substance is excited by virtue of ultraviolet illumination to generate free electrons and active free radicals, the active free radicals move to the photo-anode and are oxidized under the action of an external electric field, and the free electrons reduce the heavy metal ions in the solution. The device comprises a metal photo-anode, a counter electrode, a direct-current power supply, an ultraviolet source and a reaction vessel. Under an experimental condition, the rate of reducing Cr (VI) in the wastewater by virtue of titanium mesh photo-anode photoelectrocatalysis is 5.5 times that of typical TiO2 film semiconductor catalyst under the same reaction condition, and the repeatability is very good. The method and the device provided by the invention overcome certain defects of a photoelectrocatalysis technology and an electrocatalysis technology, and a new method capable of efficiently degrading the heavy metal ions in the wastewater is put forward, and the method is very high in practical value and application prospect, and is easy to popularize and use.

The invention provides a redox flow battery system. A positive electrolyte storage tank and / or a negative electrolyte storage tank of the redox flow battery system is partitioned into N and / or M cavities in a vertical direction, and the N and / or M cavities are arranged in a circumferential direction; during the running process and in each electrolyte storage tank, when a cavity liquid inlet valve of one of the cavities and a cavity liquid outlet valve of another cavity are opened, the other valves are closed, so that only two cavies are simultaneously communicated with a positive / negative liquid flow circulation pipeline all the time, and an electrolyte circulation loop is formed from a positive electrode / negative electrode of a battery stack; and moreover, an electrolyte is introduced to another empty cavity from a full cavity all the time, and thus, the electrolyte already flowing through the battery stack cannot be mixed with the electrolyte which does not flow through the battery stack. Therefore, by the redox flow battery system, the voltage efficiency can be improved, and the energy efficiency is further improved.

A down converter for converting an input DC voltage (Vin) into a lower output DC voltage (Vout). The down converter has on the primary side (2) an LC series resonance circuit (4) that can be connected via a first switch (S1) to the input voltage (Vin) and via a second switch (S2) to ground. On the secondary side (3), an output switch (S3) and an output capacitor (C) are each connected in parallel to the DC voltage output (Vout) and connected to each other through an inductor (L). The output switch (S3) is connected via a diode (Dr) to the input voltage (Vin) so as to divert voltage overshoots.

The invention relates to a weldable bipolar plate for a flow battery and preparation and application thereof. The weldable bipolar plate comprises a main body layer consisting of high-density polyethylene, carbon nanotubes, a coupling agent and a lubricant, and the areas, in contact with the electrode, in the middle parts of the upper and lower surfaces of the main body layer are provided with high-conductivity coatings. The area, in contact with the electrode material, on the bipolar plate has relatively high conductivity and low contact resistance, so that the ohmic polarization of the battery is reduced, and the voltage efficiency of the battery is improved; and the contact area with the electrode frame has relatively high polymer content, so that enough high welding strength can be ensured during welding, and the sealing reliability of a galvanic pile is ensured.