506 results about "Energy storage efficiency" patented technology

The invention discloses a paraffin / iron tailing ceramic composite phase change energy storage material and a melt and infiltration preparation method thereof. The composite material is prepared from the following raw materials in percentage by volume: 70 to 85 percent of paraffin and the balance of iron tailings. The composite phase change energy storage material provided by the invention has the advantages of high solid waste utilization rate, high phase change material content, high energy storage density, good mechanical property, low cost and the like; after large-scale application, the peak load shifting of energy sources can be realized; the pressure of the iron tailings on ecological environment is relieved; meanwhile, the heat conduction performance and the energy storage efficiency of the phase change material are effectively improved. The invention also discloses a melt and infiltration preparation method of the paraffin / iron tailing ceramic composite phase change energy storage material. The process parameters of the method are controllable; the operation is simple; the production period is short; products with complicated structures can be prepared.

The invention relates to an anti-ferroelectric ceramic material which is sintered at low temperatures and has high energy storage density and a method for preparing the anti-ferroelectric ceramic material. Chemical components of the anti-ferroelectric ceramic material conform to a chemical general formula of Pb<0.97>La<0.02> (Zr<x>Sn<y>Ti<1-x-y>) O<3>+a*wt.% CuO, wherein the x is larger than or equal to 0.4 and is smaller than or equal to 0.6, the y is larger than or equal to 0.4 and is smaller than or equal to 0.6, the a is larger than or equal to 0.2 and is smaller than or equal to 1, the x and the y are mole numbers, and the a is a mass percent. The anti-ferroelectric ceramic material and the method have the advantages that appropriate sintering additives are chosen, and appropriate Zr / Sn / Ti ratios are adjusted, so that the PLZST anti-ferroelectric energy storage ceramic material sintered at the temperatures of 950-1000 DEG C can be obtained; the anti-ferroelectric ceramic material is high in energy storage density and energy storage efficiency, can be used for manufacturing energy storage multilayer ceramic capacitors and has an excellent application prospect.

The invention discloses an efficient temperature stratification-type water energy-storage water-storage device, and relates to the technical filed of water energy storage, for solving the technical issue of improving the energy storage efficiency. The device comprises a water storage groove and tubular water distributors, and is characterized in that the upper part and the lower part of the inner cavity of the water storage groove are respectively provided with a water seepage flat-type porous medium plate; the plate surface of each porous medium plate is in parallel with the water level, and the periphery of each porous medium plate is jointed with the inner wall of the water storage groove and is water-proof and sealed; the tubular water distributors are two, and are all distributed in the inner cavity of the water storage groove, wherein one tubular water distributor is positioned above the porous medium plate at the upper part, and the other tubular water distributor is positioned below the porous medium plate at the lower part; and the opening of the tubular water distributor at the upper part is upwards, the opening of the tubular water distributor faces downwards, and the two tubular water distributors are communicated with the outer part of the water storage groove through a pipeline. The device provided by the invention has high energy storage efficiency.

The invention relates to the field of compressed air energy storage power generation and particularly relates to a constant-temperature air storage system applied to a compressed air energy storage power generation system. The constant-temperature air storage system comprises an air storage device 1 and a heat storage device 2 arranged in the air storage device, wherein the heat storage device 2 is a heat storage working medium; the required heat storage working medium is a phase change heat storage working medium or the heat storage working medium with the specific heat capacity more than 0.5 kJ / kgk or a combination of the phase change heat storage working medium and the heat storage working medium. The constant-temperature air storage system has the following advantages: firstly, the air storage device can adopt a cheaper steel and iron material, so that the adoption of a more expensive low-temperature-resistant material is avoided and the cost is saved; secondly, heat stored in a high-efficiency heat storage device in an air bleeding process can be used for heating air in the air storage device, so that the primary temperature of the air entering a turbo expander is increased, the work applying capability of the air is improved, and the energy storage efficiency of the system is improved.

The invention discloses a preparation method of low-loss high-energy-density sodium bismuth titanate based ceramic. The preparation method includes: weighing certain amounts of analytically pure Bi2O3, Na2CO3, TiO2, BaCO3 and SrCO3 according to a chemical proportion; mixing and ball-milling zirconium oxide ball, material and alcohol according to a volume ratio of 3:1:1; drying the ball-milled material, pressing the material into blocks, and pre-sintering to obtain pre-sintered powder; placing the pre-sintered powder in a ball-milling tank for milling for 10-12h, and drying before sieving; pressing sieved powder for forming; sintering a wafer at temperature of 1100-1200 DEG C; polishing the wafer sintered into ceramic, cleaning, coating silver size, and sintering at temperature of 550 DEG C to obtain a silver electrode. By optimizing ceramic formulation, energy density and energy efficiency of BNT-based ceramic are both improved. When an electric field at room temperature is 95kV / cm, the energy density of the ceramic is up to 1.22J / cm3, and energy storage efficiency is up to 91%.

The invention discloses a low-temperature and high-pressure liquid air energy storage system. The system comprises a drive motor, a compressor unit, a cooler unit, a cold accumulator, a liquid air storage tank, a throttle valve, a heater unit, an expansion unit and a power generator. The drive motor, the compressor unit, the cooler unit, the cold accumulator and the liquid air storage tank are sequentially connected to form an energy storage channel. The liquid air storage tank, the throttle valve, the cold accumulator, the heater unit, the expansion unit and the power generator are sequentially connected to form an energy releasing channel. According to the system, air is stored in the liquid storage tank in a high-pressure and low-temperature liquid state manner, limitation from the geographical environment is avoided, and the energy storage density is high; the liquefaction ratio of the system can theoretically reach 100%, backflow gas losses are avoided, and the energy storage efficiency is further improved; and in addition, the system is more simple in structure and low in energy consumption.

The invention discloses a bismuth ferrite-based dielectric film for high-density energy storage and a preparation method and application thereof. The bismuth ferrite-based dielectric film is characterized in that a general formula of the chemical composition of the dielectric film is (1-x)BiFeO(3-x)SrTiO3, wherein x is a mole fraction greater than 0 and less than 1. The dielectric film has excellent energy storage property; the energy storage density can reach 70.3J / cm<3>; and the energy storage efficiency is as high as 70%.

The invention discloses a carbon dioxide gas-liquid phase change energy storage method. The method comprises the following steps that firstly, when electric power is in surplus, carbon dioxide in a carbon dioxide warehouse is compressed and cooled to be liquefied into liquid carbon dioxide, and the thermal energy released during compressing and liquefying is stored through a phase change energy storage heat exchange system; secondly, when power is needed, the liquid carbon dioxide is gasified by reducing pressure and absorbing the thermal energy stored in the phase change energy storage heat exchange system, the gaseous carbon dioxide enters an expansion machine to act, and the expansion machine drives a power generator to generate electricity. A device for achieving method is characterized in that the carbon dioxide warehouse is connected with the phase change energy storage heat exchange system through a gaseous carbon dioxide pipeline via a compressor, a liquid carbon dioxide storage tank is connected with the phase change energy storage heat exchange system through a liquid carbon dioxide pipeline, and the phase change energy storage heat exchange system is connected with the carbon dioxide warehouse through a gaseous carbon dioxide pipeline. The gas-liquid phase change energy storage efficiency is high, and safety and reliability are achieved.

The invention discloses a high-voltage high-energy density unleaded ceramic dielectric material. The components of the material are expressed through the general formula (0.95-x-y-z)Bi0.5Na0.5TiO3-xBi0.5K0.5TiO3-yBa0.65Sr0.35TiO3-zK0.5Na0.5NbO3-0.05LiTaO3, wherein x, y, z represent mole fractions; x is larger than or equal to 0.002 and smaller than or equal to 0.3; y is larger than or equal to 0.002 and smaller than or equal to 0.2; z is larger than or equal to 0.001 and smaller than or equal to 0.3. The material is sintered by adopting electric discharge plasma; uniform dense ceramic texture can be obtained at a low sintering temperature; the ceramic has excellent energy storage density, energy storage efficiency and high voltage electricity constant; the energy storage density can reach 1.75 J / cm<3>; the energy storage efficiency can reach 65%; the piezoelectric constant d33 can reach 682 pm / V; the practicability is good.

The invention relates to a similar linear lead-free relaxor ferroelectric ceramic material and a preparation method thereof, and belongs to the field of dielectric capacitor material preparation. Thesimilar linear lead-free relaxor ferroelectric ceramic material has a chemical composition being 0.82Na0.5Bi0.5TiO3-0.18CaTiO3; when the electric field intensity of the material is 180kV / cm at the room temperature, the effective energy storage density is 2.34J / cm<3>, the total energy storage density is 2.87J / cm<3>, and the energy storage efficiency is larger than 80 percent; in addition, when a temperature stability test is conducted at 30 to 150 DEG C, the energy storage efficiency is maintained to be above 80 percent and is relatively stable, so that the similar linear lead-free relaxor ferroelectric ceramic material becomes an ideal material applied to high energy storage density; and meanwhile, the material is prepared and synthesized by adopting a traditional solid-phase reaction method, the preparation method is simple, the requirement on equipment is low, the sintering temperature is relatively lower (below 1180 DEG C), the reaction conditions are easily controlled, and the repeatability is good.

The invention discloses a lead-free relaxation antiferroelectric ceramic energy storage material, and a preparation method thereof. The chemical formula is (1-x-y)(Na<0.5>Bi<0.5>)TiO<3-x>(Sr<0.7>Bi<0.2>)TiO<3-y>Me<2>O<3>, wherein Me is used for representing one or two elements selected from La, Sm, and Dy, x and y are used for representing molar fractions, 0.2<=x<=0.7, and 0.01<=y<=0.2. The lead-free relaxation antiferroelectric ceramic energy storage material is relatively in energy storage density, energy storage efficiency, and possesses relaxation characteristics, and the preparation method is simple.

The invention provides a lead-free ceramic dielectric material with high energy storage density and high energy storage efficiency, of which the chemical formula is (1-x) [0.84 (Bi0.5 Na0.5) TiO3-0.16 (Bi0.5 K0.5) TiO3]-xK0.5 Na0.5 NbO3, wherein x is equal to 0.06-0.15, the energy storage density is 1.51-1.89 J / cm<3>, and the energy storage efficiency is 58.1-78.4%. A preparation method of the lead-free ceramic dielectric material with high energy storage density and high energy storage efficiency comprises the following steps: (1) after raw materials are prepared, putting the materials into a ball mill to carry out mixed ball-milling by using a wet ball-milling method, and drying and pre-calcining the obtained substance so as to obtain ceramic powder; (2) adding a binder into the ceramic powder, mixing the obtained mixture, and pressing the obtained mixture so as to obtain a green ceramic blank piece; and (3) carrying out batch drop on the green ceramic blank piece, and sintering the obtained substance by using a two-step sintering method, so that the lead-free ceramic dielectric material with high energy storage density and high energy storage efficiency is obtained. The method is simple in preparation process and low in cost, and has no pollution, and the prepared ceramic material has a relatively high energy storage density and relatively high energy storage efficiency at room temperature.

The invention, relating to the field of cell manufacturing and energy storage, discloses an enhanced ion-exchange membrane for a vanadium cell, solving the problems that Nafion membranes have low vanadium resistance and have influence on vanadium cell performances in the prior art. The preparation method is characterized by carrying out ultrasonic dispersion on the prepared nano carbon particles containing functional groups in a Nafion resin solution, and then conducting cast molding to obtain the enhanced membrane material. According to the method, by doping the nano carbon material whose surface contains functional groups (carboxyl or hydroxyl, etc.) in a matrix membrane material to enhance the vanadium resistance and ion exchange rate of the membrane material, thus the energy storage efficiency of the cell can be raised. The prepared ion-exchange membrane has outstanding stability. The cell performance is tested by using the prepared membrane material as a cell membrane and using 1.5M vanadyl sulfate and 2M sulfuric acid as an electrolyte, and the cell performance is obviously raised. The result of the test by vanadium resistance experiments shows that the vanadium resistance of the membrane is obviously raised.

The invention, relating to the field of cell manufacturing and energy storage, discloses a surface modification method for raising the activity of an electrode material of a vanadium cell, comprising the following steps: firstly cleaning the electrode material of the vanadium cell to remove surface impurities, then carrying out modification treatment of the electrode material by using plasma, reacting the gas which generates plasma with the electrode surface under ionization state to generate polar functional groups; and finally carrying out ultrasonic cleaning on the modified electrode material for 5-30 min and drying at 60-120 DEG C. According to the invention, by using the method of the invention to carry out surface modification on the electrode material of the vanadium cell, the hydrophilcity of the electrode surface is enhanced, partial polar functional groups has good catalytic influence on electrode reaction, and the energy storage efficiency of the cell is expected to increase. The method can be used for processing material surfaces with various morphologies and can keep mechanical properties and the like of material matrixes, the experiment condition are easy to control and the method has no pollution to environment. The method is efficient and environmentally friendly.

The invention belongs to the field of application of novel environment-friendly high-efficiency energy storage technology, and particularly relates to a device and a method for utilizing a hydrated salt phase-change material to stabilize a supercooling energy storage device and application. The method includes heating hydrated salt crystals in summer until being completely melted and having a certain superheat degree, and injecting superheat liquid into a circular-arc chamfering or oval-arc chamfering flat cuboid container with a smooth inner wall for sealing; standing in an indoor environment, stably storing the phase-change material in the container in a supercooling liquid form for a long time, storing most of melting heat, and applying mechanical vibration, an electric field, a magnetic field, ultrasonic waves or local low temperature on the device to trigger the device for crystallization energy releasing when heat supply is needed in winter. Compared with conventional cross-season energy storage systems, the energy storage device has the advantages being smaller in heat-radiating loss and higher in energy storage efficiency in the process of energy storage, and being simple to manufacture and low in cost; the used phase-change material is large in energy storage density, and is applied in a cross-season energy storage system, size of the energy storage device is greatly reduced, initial cost is saved, and convenience in control is realized.

The invention discloses a ceramic material with high energy storage density and energy storage efficiency and a preparation method thereof. The chemical formula of the ceramic material is (1-x)(KyNal-y)NbO3-xBi(Mg2 / 3Nb1 / 3)O3, wherein x is greater than or equal to 0.08 and less than or equal to 0.5, and y is greater than or equal to 0.2 and less than or equal to 0.8. By adding Bi(Mg2 / 3Nb1 / 3)O3, the breakdown strength of the (KyNal-y)NbO3-based ceramic is enhanced remarkably, reaching 240kV / cm, and the effective energy storage density is 0.59J / cm<3> to 1.66J / cm<3>, and the energy storage efficiency is 49.4 to 95 percent; by batching, drying, grinding, secondary presintering, granulation, forming, sintering, grinding and silvered electrode sintering, the ceramic material is obtained, and the preparation process is simple; the cost is low; no pollution is produced, and the ceramic material has the advantages of high energy storage density, high energy storage efficiency, simple preparation process, low preparation cost and high practicability.

The invention discloses a silicon-carbon material serving as a lithium ion battery anode and a preparation method thereof. The silicon-carbon material is of a structure that carbon coats porous silicon. The preparation method of the silicon-carbon material serving as the lithium ion battery anode comprises the following concrete steps: (1) preparing porous silicon; (2) preparing a carbonization precursor; and (3) obtaining an anode electrode material. The silicon-carbon material disclosed by the invention can effectively alleviate great volume change in a porous silicon electrode reaction process, and an electrode can be beneficially and fully wetted by electrolyte, so that energy storage efficiency is improved; and diffusion distance of lithium ions also can be shortened, and electron conduction in the porous silicon electrode is promoted, so that charge-discharge efficiency is improved. Meanwhile, a micro-sized carbon fiber and a nanoscale porous silicon lithium ion battery anode material which are manufactured by adopting the silicon-carbon material are large in specific surface area and length-diameter ratio and also have the advantages of small pore diameter, high porosity andhigh fiber uniformity, and the used raw materials are fewer and steps are simple, thereby being beneficial to industrial mass production.

A preparation method of a silk fibroin energy storage and temperature regulation fiber membrane includes the following steps of preparing a regeneration silk fibroin aqueous solution with the concentration of 2-6 wt% and a regeneration silk fibroin aqueous solution with the concentration of 10-20 wt%; weighing organic phase-change materials, wherein the mass ratio of the organic phase-change materials to regeneration silk fibroin is between 1 to 1.2 and 2 to 1; adding the solution A to the melted materials to conduct emulsification for 10-30 min to obtain emulsion; measuring ethyl alcohol, wherein the volume ratio of ethyl alcohol to the solution A is between 3 to 20 and 7 to 20; adding emulsion, conducting stirring, and inducing silk fibroin to generate conformation conversion; conducting unfreezing after conducting freezing, and obtaining suspension liquid with phase-change energy storage microcapsules as the suspension phase and with water as the dispersion phase; adding suspension liquid to the solution B to be evenly stirred, conducting concentration till the concentration is 25-35 wt%, injecting the mixture into an electrostatic spinning device for electrostatic spinning, and obtaining the silk fibroin energy storage and temperature regulation fiber membrane. The method solves the problems that energy storage and temperature regulation fiber manufactured in the prior art is low in strength and energy storage efficiency.

The invention discloses a novel method and device for compressed air energy storage, and particularly discloses a compressed air energy storage method and device suitable for variable working condition operation. According to the compressed air energy storage method and device suitable for the variable working condition operation, the variable working condition input power range of input electric energy is divided into a plurality of levels, and all the power levels correspond to the pressure levels of a compressed air energy storage system. When the input electric energy power change is large, the variable working condition operation is achieved by changing the compressed air pressure levels of the compressed air energy storage system, and the electric energy is stored; when the input electric energy power change is small, the compressed air pressure levels of the compressed air energy storage system remain the same, the variable working condition operation is achieved by adjusting the flow of the compressed air, and the electric energy is stored. Compressed air of different pressures is stored respectively through a constant pressure storage mode. The compressed air energy storage method and device suitable for the variable working condition operation are adopted for carrying out compressed air energy storage, the fact that all the main equipment of a system runs around a rated condition all the time can be guaranteed under the condition that the electric input power changes frequently by a large margin, and therefore the energy storage efficiency of the energy storage system can be improved greatly.

The invention belongs to the technical field of electric energy storage of compressed air, in particular to a method and system for increasing energy storage efficiency of compressed air by using ORC.The method comprises the following steps: during an energy storage process, compressing air and storing compression heat into a heat storage tank; during an energy releasing process, heating high-pressure air by a part of heat in the heat storage tank, wherein heated air enters an expansion machine to do work through expansion and the remaining heat of a heat storage working medium after an expansion process and the remaining partial heat in the heat storage tank are used for organic rankine cycle to generate electricity. The system comprises a compressor unit, a first heat exchanger, an airstorage tank, a second heat exchanger and an expansion unit. The first heat exchanger is connected with the heat storage tank. The heat storage tank is connected with the second heat exchanger and anorganic rankine cycle electricity-generating system. The remaining heat storage amount in a compressed air energy storage system is fully utilized. Firstly, the remaining heat is firstly used for pre-heating an organic working medium. Then, storage heat that cannot be fully used is used for reheating the working medium in order to ensure that heat is completely leveraged.

The invention relates to the field of battery manufacturing and energy storage, in particular to an ion liquid reinforced film for vanadium ion redox flow battery and a preparation method thereof, aiming to solve the problems that the diaphragm vanadium resistant performance for all fluorinated, partial fluorinated and non-fluorine vanadium battery is low and the battery performance of vanadium battery is influenced. The ion liquid reinforced film for the vanadium ion redox flow battery comprises the following components in percentage by weight: 80-90 percent of film forming matrix macromolecular material and 1-20 percent of ion liquid, wherein the sum of the weight of the film forming matrix macromolecular material and the ion liquid is 100%. The method comprises the following steps of dissolving the film forming matrix macromolecular material in organic solvent, dispersing the ion liquid in the film forming matrix solution through agitating and ultrasonic ways, and preparing a reinforced compound film material through solution evaporating and molding by casting in a plane. According to the method provided by the invention, repellency is doped in the matrix film material, and the vanadium resistant property of the film material is strengthened through ion liquid with higher conductivity, so that the reduction of battery performance caused by vanadium ion penetration and migration can be effectively inhibited, and the energy storage efficiency of the battery can be improved.

The invention discloses a preparation method of a crosslinked nano-cellulose / hexagonal boron nitride nanosheet composite film. The composite film is prepared by the steps of compositing nano-cellulosewith diameter of 2nm-20nm and length of 100nm-5micron with a hexagonal boron nitride nanosheet with excellent dielectric property, and soaking into a polyvalent metal salt solution. The composite film provided by the invention has relatively low dielectric loss and relatively high disruptive strength, energy storage density and energy storage efficiency. Besides, the composite film further has agood stratified structure, and the thermal stability of the composite film is remarkably improved after crosslinking. The composite film has wide and highly-potential application prospects in the application of dielectric energy storage.

The invention belongs to avionics technology, is applied to the technical field of avionics, and particularly relates to an aviation onboard recorder independent power supply. The aviation onboard recorder independent power supply comprises a charging circuit 1, a control unit 2, an energy storage unit 3, a power supply voting unit 4 and a boosted circuit 5. As a super-capacitor is adopted as the energy storage unit, compared with a charging battery, the aviation onboard recorder independent power supply has the advantages that the cycle life is more than 100 times that of the charging battery, maintenance-free of the energy storage unit of the recorder independent power supply in a full life circle is achieved, large-current charging and discharging can be borne, self-heating quantity is small, energy storage efficiency can be improved conveniently, and the heat dissipation design can be simplified conveniently. The aviation onboard recorder independent power supply is designed according to requirements of the TSO-C155 airworthiness standard, adopts the super-capacitor for energy storage, and is capable of providing a 12 W back up power supply which can last 10 minutes for a recorder after being charged for 15 minutes when a main power supply of an aircraft is cut off.

The invention discloses a ceramic material integrating high energy storage density and efficiency, and a preparation method thereof, wherein the chemical formula is (1-x)NaNbO3-x(Bi0.5Na0.5)HfO3, x ismore than or equal to 0.05 and is less than or equal to 0.2, and the material is obtained through material matching, ball milling, pre-firing, secondary ball milling, granulation molding, debinding,firing, polishing and coating with a silver electrode. According to the present invention, the energy storage density calculated based on electric hysteresis loop is 0.99-3.51 J / cm<3>, and the energystorage efficiency is 60-80.1%; and the material as the novel energy storage ceramic material has advantages of high energy storage density, simple preparation process, low cost, no pollution, easy mass production and the like, and further has strong practicability.

The invention relates to the technical field of battery power supplies and in particular discloses a novel power supply with comprehensive performances of a supercapacitor and a zinc-silver battery. The power supply comprises electrolyte, a positive pole, a diaphragm and a negative pole, wherein the positive pole is isolated from the negative pole; the positive pole, the negative pole and the diaphragm are arranged in a battery shell, and the electrolyte is filled in the battery shell; the positive pole simultaneously has comprehensive capacities of a positive pole of the zinc-silver battery and a positive pole of the supercapacitor; the negative pole simultaneously has comprehensive capacities of a negative pole of the zinc-silver battery and a negative pole of the supercapacitor. According to the power supply, the advantages of high specific power of the supercapacitor and high energy of the zinc-silver battery are integrated, the problems that the battery polarization is sharply increased, the internal loss is increased, the energy storage efficiency is reduced, the voltage fluctuation is great and the like during high-current pulse discharge of the conventional zinc-silver battery are solved, the volume and weight are reduced, and the voltage accuracy and specific energy are improved.

The invention provides a polyimide high-temperature dielectric composite film and a preparation method thereof. The composite film is formed by blending at least one of hexagonal boron nitride nanosheet and molybdenum disulfide nanosheet as well as polyimide. The mass fraction of the hexagonal boron nitride nanosheet is 6% to 12%, and the mass fraction of the molybdenum disulfide nanosheet is 1% to 2%. The introduction of a nanosheet filler not only improves the thermal properties of a polyimide film, but also improves the high temperature dielectric properties that a conventional PI film hasnot been involved. The composite film has the advantages of low dielectric loss, high breakdown strength, energy storage density and energy storage efficiency at normal temperature, and keeps low conductance loss and high breakdown field strength and energy storage density at the temperature of 150 DEG C.

The invention relates to a high energy density sodium-bismuth titanate based thin dielectric film as well as a preparation method and application thereof. The high energy density sodium-bismuth titanate based thin dielectric film is prepared from Bi0.5(Na0.8K0.2)0.5TiO3-xSiZrO3. The preparation method of the high energy density sodium-bismuth titanate based thin dielectric film is a sol-gel methodand comprises the following steps: preparing a precursor solution according to stoichiometric ratio, and subsequently dropwise adding the precursor solution on a cleaned Pt / Ti / SiO2 / Si substrate for rotating and coating; carrying out 150 DEG C heat treatment, 350 DEG C heat treatment and 700 DEG C heat treatment in sequence, and repeating a spin-coating and heat treatment technology until the thickness of the film reaches 500 to 600nm; in addition, a metal top electrode also can be prepared by using a sputtering technology on the thin film. Compared with the prior art, a high energy density thin film capacitor has excellent energy storage performance (energy storage density of the high energy density thin film capacitor is 25J / cm<3> and the energy storage efficiency is 79.16 percent) and good temperature stability.

The embodiment of the invention discloses a method and device for controlling the energy storage grid-connected charge and discharge capacity at the power generation side, a server and a storage medium. The method comprises the steps of acquiring historical data of the power generation side in a power station, and acquiring the actual power generation condition and power limitation condition of the power station according to the historical data; calculating the actual generation power after power station energy storage equipment is added according to parameters of the energy storage side; calculating the dual-detailed rule assessment score difference by combining the actual power generation condition, the power limitation condition and the actual generation power after the power station energy storage equipment is added; optimizing parameters of a correction function so as to minimize the dual-detailed rule assessment score difference calculated by using the optimized correction function; and adjusting the predicted power value according to the corrected and optimized parameters, and controlling the energy storage side to perform charge / discharge control according to the adjusted predicted power value. The method can effectively improve the accuracy of the predicted power, and can optimize the energy storage efficiency of energy storage equipment under the premise of meeting the dual-detailed rule assessment.

The invention discloses a heat pump water heater with a nano phase change thermal storage material. The water heater consists of a condenser filled with nano phase-change energy storage materials, a compressor, a throttling element and an evaporator. It is characterized in that the evaporator absorbs heat from the air to evaporate the heat-transfer working medium, and the temperature and pressure of the working medium steam rise after being compressed by the compressor. When the high-temperature steam is condensed into liquid through the nano energy storage condenser, the heat released is transferred to the Nano phase change energy storage materials, and store them. When the user uses hot water, the nanophase-change energy storage material releases thermal energy to heat the water in the hot water pipe. This device improves the heat transfer performance of the phase change energy storage material, and has a large energy storage density, which accelerates the energy storage and release rate of the phase change material, thereby improving the energy storage efficiency, making the phase change energy storage water heater more energy-saving and more applicable. for extensive.

The invention relates to the field of nanometer power generation, and discloses an energy management method, an energy management circuit and an energy management device for a friction nano-generator. The energy management method of the friction nano-generator comprises the steps of: storing electric energy output by the friction nano-generator temporarily in an energy temporary storage; and transferring the electric energy temporarily stored in the energy temporary storage to an energy storage. By adopting the technical schemes, the charging of the energy storage is realized through charging and discharging the energy temporary storage periodically, the impedance matching of the friction nano-generator and the energy storage is realized, and the energy storage efficiency is significantly improved, thereby the AC electric energy generated by the friction nano-generator can be efficiently converted into a constant-voltage direct current for output.