114results about How to "High degree of practicality" patented technology

The invention discloses a preparation method of a silicon and carbon-coated graphene composite cathode material. The technical problem to be solved is to enhance the electronic conductivity of the silicon-based cathode material, buffer the volume effect produced in the process of deintercalation of the lithium in the silicon-based cathode material and enhance the structure stability in the circulation process of the material at the same time. The material is prepared by using a spray drying-thermally decomposing treatment process in the invention. The preparation method comprises the following steps of: evenly dispersing nano silicon and graphite micro powder in a dispersion solution of oxidized graphene, carrying out thermal treatment under an inert protection atmosphere after spray drying, subsequently cooling along a furnace to obtain the silicon and carbon-coated graphene composite cathode material. The extra binder does not need to add in the process of manufacturing balls in the invention and the outer oxidized graphene is thermally reduced in situ to graphene in the thermal treatment process of the composite precursor, so that the process is simple and easy to operate; and the practical degree is high. The prepared composite material has the advantages of great reversible capacity, designable capacity, good cycling performance and high-current discharging performance, high tap density and the like.

The invention discloses a preparation method for a composite cathode material of a lithium ion battery by means of spray drying pyrolysis treatment. The preparation method includes the steps: dissolving a first type of binder organic carbon source into solvent of a proper quantity, adding a silicon source, a second type of binder and a dispersing agent, dispersing uniformly, adding graphite, dispersing for a certain time, subjecting uniformly dispersed suspension to spray drying, and using the first type of binder organic carbon source to bond the silicon source, the graphite and the second type of binder particles into spherical or spherical-like forms to obtain a composite precursor; and transferring the precursor into a shielding atmosphere for sintering, heating the second type of binder to a certain temperature to be melted into a liquid crystal state, bonding the particle silicon source and the graphite into cores, subjecting the organic carbon source to pyrolysis at the high temperature to form a coating, and furnace cooling to obtain the carbon-silicon composite cathode material of the lithium ion battery. The preparation method is simple, easy in implementation and high in practicality. The carbon-silicon composite prepared by the method has the advantages of high reversible capacity, designable capacity, high circulating performance and high-current discharging performance, high tap density and the like.

The invention discloses a composite lithium-rich anode material of a lithium battery, its preparation method and its application. According to the invention, the surface modified lithium-rich material comprises a metal salt of a coating layer (M' denotes Mo, Zn, Ti, V, W) and a main phase Li[Li1-x-y-zMnxCoyNiz] O2 (0.1<=y=z<x<=2/3), wherein the mass ratio of the two is 0-50%. The preparation method comprises the following steps: dissolving the obtained Li [Li1-x-y-zMnxCoyNiz]O2 (0.1<=y=z<x<=2/3) lithium-rich material in a transition metal salt solution of 0.02-10g/L, well mixing and drying the solution under the temperature of 50 - 150 DEG C, and then calcining under the temperature of 200 DEG C - 800 DEG C for 2 - 12 hours to obtain the surface modified Li [Li1-x-y-zMnxCoyNiz]O2 (0.1<=y=z<x<=2/3) lithium ion battery anode materials. The present invention reduces initial irreversible capacity loss of the lithium-rich material, and is capable of greatly improving the multiplying power performance and the cycle performance, as well as meeting the requirement of the high-power lithium ion battery.

The invention discloses a method for preparing silicon carbide composite particles and application thereof as a cathode material of a lithium ion battery. The method for preparing silicon carbide composite particles comprises the following steps: 1) performing electrostatic spraying on solution containing a silicon source and a carbon source so as to obtain spherical particles, wherein the carbon source is a carbon-containing high-molecular polymer; and 2) sintering the spherical particles in a non-oxidizing atmosphere to obtain the silicon carbide particles. The method enables one-step forming without needing a template and has high practicality; and moreover, the obtained silicon carbide composite particle integrates the advantages of the silicon carbide composite material with the advantages of a porous material, and improves the problems of weak cyclicity and low coulombic efficiency of using silicon-based material as the cathode material of the lithium ion battery.

The invention provides a high-compaction density silicon-carbon negative electrode material and a preparation method and an application thereof. The silicon-carbon negative electrode material is formed by mixing silicon powder, graphite and an additive at a certain ratio; and the final product is obtained by burning, coating and re-burning the silicon-carbon negative electrode material, wherein the silicon-carbon composite material is of a porous spherical structure; silicon is evenly dispersed into porous silicon carbon balls in a form of nanometer silicon; the particle sizes of the silicon are smaller than 200nm; and a uniform coating layer is formed on the surface of the silicon. The high-compaction density silicon-carbon negative electrode material is high in efficiency, high in capacity and good in cycling stability when applied to a lithium-ion battery, low in cost and suitable for large-scale production and the preparation method is simple.

The invention provides a spherical silicon/carbon composite material for a lithium ion battery and a preparation method thereof. The spherical silicon/carbon composite material for the lithium ion battery comprises a porous silicon/carbon composite material and an organic or inorganic carbon source filling the porous silicon/carbon composite material, wherein the content of silicon in the porous silicon/carbon composite material is 20% to 80%, and the content of carbon in the porous silicon/carbon composite material is 20% to 80%. The spherical silicon/carbon composite material for the lithium ion battery is high in cycling stability and high in tap density if applied to a lithium ion battery, and can be produced on a large scale.

The invention discloses an alkaline earth metal germanate nanomaterial and a preparation method thereof and use of the nanomaterial as a cathode material of lithium ion batteries. The method comprises the following steps of: (1) mixing an aqueous solution of alkaline earth metal salt and germanium source compound GeO2 to obtain a liquid mixture; (2) allowing reaction of the liquid mixture obtained in the step (1) to take place in a polytetrafluoroethylene-lined high-pressure reaction kettle after heating, and cooling after the reaction is completed to obtain the alkaline earth metal germanate nanomaterial. The method is simple, has abundant and easily-available raw materials, is suitable for large-scale production and has a high level of practicability. The obtained alkaline earth metal germanate is a nanomaterial, has a high actual capacity, can be directly used as a cathode material of lithium ion batteries, solves the problem that the germanium-based material as lithium ion battery cathode material has a poor cycling property and takes a violent change of volume during charging/discharging process, and can be directly used as the cathode material of lithium ion batteries.

The invention discloses a porous silicon-carbon composite material and a preparation method thereof. The porous silicon-carbon composite material is formed by bonding a silicon-based material and a carbon-based material. The silicon-based material comprises silicon, a silicon oxide and silicate, and the silicate is dispersed in a silicon oxide substrate. The carbon-based material comprises a carbon material and an amorphous carbon coating material. The carbon material and the silicon-based material are in contact with each other and are bonded together to form a porous structure, and the amorphous carbon coating material coats the surface of the porous structure. The condition is that the total mass of the porous silicon-carbon composite material is 100%, and the mass percentage content ofsilicate is 5%-30%. The porous silicon-carbon composite material shows an extremely low expansion rate when used as a lithium ion battery negative electrode material, and has high specific capacity,high initial coulombic efficiency, excellent cycle performance and excellent rate capability. In addition, the preparation method is simple, and is a method suitable for industrial large-scale production of the silicon-carbon composite material for lithium ion batteries.

The invention discloses a preparation method of a zinc ferrite nano-material and belongs to the technical field of nano-material preparation. The ZnFe2O4 nano-material is prepared in the way that a solvothermal method is adopted to prepare a metal-organic precursor material, and then a high-temperature calcining method is adopted for treatment. The zinc ferrite nano-material is prepared by the following steps: zinc nitrate hexahydrate, ferric acetylacetonate, terephthalic acid and polyvinylpyrrolidone are dissolved in a N,N-dimethylacetamide and ethyl alcohol mixed solution; stirring is performed at the room temperature, an obtained turbid liquid is transferred into a reaction kettle, heating is performed under a certain temperature condition, and centrifugal separation and vacuum drying are performed to obtain a precursor Fe III-MOF-5 nano-material; and high-temperature calcination is performed at a certain temperature to obtain the ZnFe2O4 nano-material. The preparation method is simple, green, pollution-free and high in degree of practicability, and the prepared ZnFe2O4 nano-material can directly serve as a gas-sensitive material for use.

The invention discloses a preparation method and application of an in-situ carbon-compounded prussian blue type compound thin film. The preparation method comprises the following steps: (1) carrying out ultrasonic dispersion on carbon materials in a NaCl solution; (2) weighing transition metal cyano complexes, a reducing agent and inorganic acid in a ratio and adding into the solution; (3) electrolyzing for 3-5 minutes in water to clean the surface of an ITO conducting substrate; and (4) generating the in-situ carbon-compounded prussian blue type compound thin film on the ITO conducting substrate under a constant-voltage condition relative to voltage from -2.0V to 2.0V of a standard Ag/AgCl electrode. According to the preparation method and the application, the film is formed in one step, the preparation method is rapid and simple and low in cost and the electrical conductivity of the obtained compound material is greatly improved; and the content of sodium is high, and vacancy and the water content are low. As a sodium-ion battery positive electrode material, the material has the characteristics of high specific capacity, high cycling stability, excellent rate performance and the like, and has a bright prospect in large-scale development and application of sodium-ion batteries.

The invention relates to a measuring method for an effective value of an electric parameter of an electric motor powered up by a frequency converter and a frequency control system. The method comprises the following steps of: (a) obtaining a period T of the electric parameter, determining the sampling frequency N according to the period T, and establishing an array {p(0)2, p(1)2, p(2)2, to p(N)2, p'} for data storage; (b) sampling the electric parameter N times in one period T, and sequentially storing the square of the sampling value to p(1)2, p(2)2, to p(N)2; and (c) utilizing a formula to compute the effective value P of the electric parameter in the period T. By adopting the method, the effective value of a non-sinusoidal periodic electric signal can be precisely obtained in real time, the computational method is simple, the treatment of an arithmetic unit is convenient and fast, the requirements for hardware are low, and the practical degree is high.

The invention discloses a preparation method and an application of reduced graphene oxide. The reduced graphene oxide is prepared through an ionothermal technology. The method comprises the following steps: adding graphene oxide into an ionic liquid, carrying out ultrasonic dispersion to obtain an ionic liquid solution of graphene oxide, heating the solution to 150-220DEGC, reacting for 6-30h, cleaning, and freeze-drying to obtain the reduced graphene oxide. The preparation method has the advantages of simplicity, no pollution and high practicality degree, and the obtained reduced graphene oxide can be directly used as a super capacitor electrode material.

The invention discloses a day-ahead power generation plan optimization method based on thermal power fusion and electric energy storage combined peak shaving. The day-ahead power generation plan optimization method comprises the following steps: S1, acquiring relevant parameter information of deep peak regulation and electric energy storage bidirectional peak regulation of a thermal power generating unit, and generating a day-ahead power generation plan calculation scene of thermal power fusion and electric energy storage combined peak regulation in combination with various parameter information required by a day-ahead power generation plan; S2, generating a day-ahead power generation plan optimization model of thermal power fusion electric energy storage combined peak regulation accordingto the parameter information in S1; and S3, carrying out optimization calculation and safety check on the day-ahead power generation plan optimization model of thermal power fusion electric energy storage combined peak regulation generated in the S2 to obtain a day-ahead power generation plan, and clearing the price of a peak regulation auxiliary service market. The day-ahead power generation plan optimization method can improve the day-ahead plan execution rate, promote the new energy consumption and meet the increasingly lean large power grid safety operation demands under the condition offully evaluating the next-day new energy consumption capability and the system load peak regulation demands in combination with the next-day power grid operation mode.

The invention discloses a nano silicon alloy based composite negative pole material. The nano silicon alloy based composite negative pole material has a three-shell layer structure, wherein a core layer is a nano carbon material coated nano silicon alloy core layer, and a three-shell layer is of a three-shell layer structure and is a conductive polymer film layer which is prepared by taking Fe3O4 nano-microspheres as sacrificial templates. The invention further discloses a preparation method of the nano silicon alloy based composite negative pole material. According to the preparation method, firstly, a nano silicon alloy material is prepared by a ball milling method and is subjected to wet grinding with a nano carbon material, then, hot coating is carried out so as to form the nano carbon material coated nano silicon alloy core layer, and then, the conductive polymer film layer with the three-shell layer structure is formed on the surface of the core layer by using a sacrificial Fe3O4 microsphere template method, so that the volume expansion of the nano silicon alloy material is effectively buffered. The nano silicon alloy based composite material disclosed by the invention has the advantages of high specific capacity, excellent cycle performance and rate performance, high tap density, and the like. The preparation method of the negative pole material, provided by the invention, is simple, environmentally friendly and pollution-free.

The invention relates to a chlorine-doped modified lithium ion battery lithium-rich cathode material and a preparation method thereof and belongs to the field of lithium ion batteries. The cathode material is Li[Li0.2Ni(0.2-0.5b+0.5a)CobMn(0.6-0.5b-0.5a)]O(2-a)Cl(a), wherein a is more than 0 and not more than 0.1, and b is not less than 0 and not more than 0.13; and lithium salt, nickel salt, manganese salt, cobalt salt, lithium chloride and a combustion improver are ground into fine powder, a solvent is added and then uniformly mixed, and the lithium ion battery lithium-rich cathode material is obtained by firing. The lithium ion battery lithium-rich cathode material is high in discharge specific capacity, high in cycle stability, high in magnification performance and compatible in high-temperature performance and low-temperature performance, and can meet requirements of a power battery. The chloride salt for doping is rich in source, low in cost, environment-friendly, simple and practicable in synthesis process, low in manufacturing cost, convenient for large-scale industrial production and high in practicability.

The invention belongs to the field of battery electrode materials, and relates to a method for preparing heteroatom co-doped porous carbon materials based on a direct ionic liquid carbonization method. The heteroatom co-doped porous carbon materials prepared by the direct ionic liquid carbonization method have proper pore size distribution and high specific surface area, and show high specific capacity and excellent circulating stability when serving as super-capacitor and lithium secondary battery electrode materials. The synthesis process of the heteroatom co-doped porous carbon materials synthesized by the direct ionic liquid carbonization method is simple, and other heteroatom sources are omitted. The heteroatom co-doped porous carbon materials synthesized by ionic liquid serving as a green solvent is green, environmentally friendly and high in practical level, and the problems of toxicity and complexity of a current preparation process of heteroatom doped electrode materials are solved.

A wave soldering tank is provided on which it is easy to perform maintenance, which does not have fluctuation of the height of spouted solder, which does not damage the rotating shaft of a discharge pump, and which can be stably used for long periods.

The wave soldering tank 1 has a tank body 1a which houses molten solder S, a discharge pump 5 which pumps molten solder S, a discharge nozzle 4 which spouts molten solder S which was sent to it by the discharge pump 5 upwards, a duct 2 having the discharge pump 5 installed at one of its ends and the discharge nozzle 4 installed at its other end, an oxidation preventing member 22 which has a prescribed size and which floats on the surface of the molten solder S, and an engaging means 13 which controls rotation of the oxidation preventing member 22 in a horizontal plane. The oxidation preventing member 22 has a surrounding member 28 which extends downwards at its center and which surrounds the rotating shaft 10 with a gap between it and the rotating shaft 10, and a hollow space 26 in its interior for providing buoyancy.

The invention discloses a waste heat recovery system of a liquid cooling data center. The waste heat recovery system comprises a first heat exchanger, a heat dissipation system, a solar heat collection and heat storage system and a heat energy utilization system, wherein each system is a circulation loop internally provided with a working medium flow, the first heat exchanger is a part of the heatdissipation system, the heat dissipation system and the solar heat collection and storage system are connected with the heat energy utilization system through a heat exchange pipeline and the solar heat collection and storage system to provide heat energy, and the waste heat of the solar heat collection and heat storage system is used for civil heating. The solar heat collection and heat storagesystem is used for upgrading a low-temperature waste heat source, energy storage is carried out, the input energy fluctuation in the daytime and at night is balanced, the heat source is utilized for heat energy utilization, the waste heat is used for providing hot water and heating for a building, redundant low-grade heat is discharged into the environment through a cooling tower, and the waste heat recovery efficiency of the liquid cooling data center is improved, the energy consumption of the data center is reduced, the energy utilization efficiency is improved, the energy consumption is reduced, and meanwhile, the operation cost of the data center is reduced.

The invention discloses an air quality management method which comprises the steps that after an execution terminal is started up, the execution terminal detects whether the execution terminal has anair quality active management authority authorized by a user in advance, and if so, an air quality parameter of a site where the execution terminal is located is acquired and the acquired air qualityparameter is transmitted to a cloud server; the cloud server generates a corresponding air quality executive instruction according to the received air quality parameter and user authorization information which is stored in advance and corresponds to the execution terminal, and the cloud server issues the generated air quality executive instruction to the execution terminal; and the execution terminal executes a corresponding air conditioning function according to the air quality executive instruction. The invention further discloses an air quality management system and a computer-readable storage medium. System product design related to air quality management can be simplified, the cost is lowered, and the intelligent degree, the practical degree and the user privacy protection degree of the air quality management are improved.

The invention relates to a high-altitude wind energy power generation system and a high-altitude wind energy power generation air bag. The high-altitude wind energy power generation system comprises at least one high-altitude wind energy power generation device, and each high-altitude wind energy power generation device comprises an umbrella-shaped kite and a high-altitude power generation part; each high-altitude power generation part is composed of a turbo machine and an electric generator, and each umbrella-shaped kite is of a gradually-shrinking structure from front end to rear end; an opening is formed in the rear end of each kite, and each turbo machine is fixedly arranged at the position of the corresponding opening; and when the power generation system comprises at least two high-altitude wind energy power generation devices, the electric generators in all high-altitude wind energy power generation devices are in series connection; the power generation air bag comprises an air bag body and a power generation part; and both the power generation system and the power generation air bag can achieve high wind speed, high rotating speed, high voltage, small weight and small size, and therefore the functionization degree of the power generation devices is improved. The electric generators in the power generation devices of the power generation system are arranged in a series-connection manner, and the electric generation voltage can be greatly improved.