67results about How to "Decrease decay speed" patented technology

The embodiment of the invention provides a luminance compensation method and a self-illumination display device, and relates to the technical field of display devices. According to the luminance compensation method and the self-illumination display device, attenuation difference of self-illumination elements in all areas after the self-illumination display device works for a long time can be reduced, and the lumpy mura phenomenon occurring after a displayer of the self-illumination display device works for a ling time can be avoided. The luminance compensation method comprises the steps of obtaining a pre-stored compensation factor table of the self-illumination display device, wherein the compensation factor table comprises compensation factors of N areas, the compensation factor of the area with the temperature higher than the temperature of a standard area is smaller than G, and the compensation factor of the area with the temperature lower than the temperature of the standard area is larger than G; compensating for the luminance of images displayed in all the N areas according to the compensation factor table. The luminance compensation method is used for compensating for the luminance of the self-illumination display device.

The invention discloses a complex reverse osmosis membrane which comprises a non-woven fabric layer and a polysulfone supporting layer, wherein a crosslinked polyamide layer which uses polyamine and an organic solution containing an acyl halide compound for interfacial synthesis is arranged on the polysulfone supporting layer. In the invention, the polyamine and the organic solution containing the acyl halide are adopted on the polysulfone supporting layer of the prior reverse osmosis membrane to obtain the polyamide layer with a three-dimensional crosslinked structure through interfacial condensation, thus the performance of the complex reverse osmosis membrane is further improved, and the membrane molecules have better compactness and stronger rigidness, wherein the improved compactness can improve the salt rejection rate of the membrane, and the improved rigidness can enable the membrane to have excellent anti-densification performance, thus the rate of decay of the performance of the membrane can be reduced, and the service life of the membrane can be prolonged. Therefore, the complex reverse osmosis membrane has the advantages of high salt rejection rate, large water flux, long service life and obvious reduction of engineering investment and production cost, and can be widely applied to the fields of electricity, metallurgy, petroleum and petrochemical industry, medicine, food, municipal engineering, seawater desalination, and the like.

The invention provides a silicon-based composite material and a preparation method thereof, a silicon-carbon composite material, and a lithium ion battery containing the materials, belongs to the technical field of lithium ion batteries, and can solve the problem of capacity fading caused by a volume effect of the existing silicon-based composite material and the lithium ion battery prepared by using the silicon-based composite material in the charge and discharge processes. The preparation method of the silicon-based composite material, disclosed by the invention, comprises the steps of: mixing SiOx (x is smaller than or equal to 1.5 and greater than or equal to 0.5) and a conductive carbon substrate to obtain compound powder of the SiOx ( the x is smaller than or equal to 1.5 and greater than or equal to 0.5); and coating the compound powder by a carbon precursor to obtain a coating and carrying out carbonization reaction on the coating. The silicon-based composite material and the silicon-carbon composite material with an excellent cycle performance are obtained by selecting proper technological parameters, and the lithium ion battery containing the materials is prepared. The composite materials disclosed by the invention are prepared by using the method, and the lithium ion battery disclosed by the invention contains the composite materials.

The invention relates to the technical field of filtering separation of membranes, in particular to a rotating disc type dynamic membrane separating assembly. The rotating disc type dynamic membrane separating assembly comprises a machine frame, an outer cylinder and a motor, wherein the outer cylinder is vertically arranged on a mounting plate, the lower port of the outer cylinder is connected with the mounting plate through sealing components, and a separation barrel is arranged in the outer cylinder; a dynamic sealing bearing is arranged on the mounting plate, a hollow shaft is arranged on the dynamic sealing bearing in a rotating manner, and a plurality of filtering discs are arranged in the separation barrel; a belt wheel is arranged on the hollow shaft under the dynamic sealing bearing, and the motor is arranged on the machine frame on one side of the outer cylinder and connected with the belt wheel in a transmission manner. According to the rotating disc type dynamic membrane separating assembly disclosed by the invention, organic filtering materials in various flux specifications can be mounted on the filtering discs, the filtering discs in flat design can improve the filling densities of the organic filtering materials, and hollow flow baffles in fluid flow passage design are arranged among the filtering discs, so that a good hydraulic shear effect and rotary currents are formed on the surfaces of the membranes of the filtering discs by the flow baffles, the membrane pollution can be reduced, the generation of the concentration polarization can be alleviated, the decay speed of membrane flux is lowered, and the cleaning and maintaining period is shortened.

The invention discloses a pixel unit, a driving method thereof, a pixel driving circuit, and a display device. A pixel unit comprises a light-emitting device and at least two driving circuits connected with the light-emitting device. The at least two driving circuits are used for driving the light-emitting device in an alternative way. According to the technical scheme provided by the invention, the pixel unit comprises the light-emitting device and the at least two driving circuits connected with the light-emitting device, and the at least two driving circuits are used for driving the light-emitting device in an alternative way. By adopting the at least two driving circuits to drive the light-emitting device in an alternative way, the vth drift of the driving circuits generated by being arranged under a positive bias for a long time is effectively reduced, and therefore the attenuation speed of the vth is reduced, and the service lifetimes of the driving circuits are prolonged.

The invention provides a battery charging method and device and a computer readable storage medium, and relates to the field of a battery. The battery charging method comprises the step of performing constant-power charging on the battery with a preset power to a charging ending voltage, wherein the charging ending voltage is higher than an ending voltage of the battery which is charged in constant current and constant voltage and is lower than an upper limit of the highest safety rechargeable voltage of the battery. With the battery charging method and device and the computer readable storage medium, provided by the embodiment of the invention, the lifetime of the battery for charging in constant power can be prolonged.

The invention relates to a unipolar horizontal battery which comprises a battery jar, positive and negative polar columns, front and back covers and pole groups connected in series together, wherein a pole group accommodating cavity which is used for accommodating the pole groups is in front-back direction and is opened at front and back parts is formed in the battery jar; positive and negative tabs are respectively arranged the left ends or the right ends of front and back sides of the positive and negative pole plates; cavities for accommodating the positive and negative tabs are formed on the front and back covers; holes through which the positive and negative polar columns penetrate and an injection hole are formed in the front cover, and the front and back covers are hermetically connected with the front and back sides of the battery jar, respectively. A manufacturing method of the unipolar horizontal battery comprises the following steps: 1, manufacturing each part of the battery; 2, filling and coating positive and negative active substances on the positive and negative poles; 3, manufacturing pole groups, welding the positive and negative polar columns, and welding a splice behind the pole groups; 4, putting the pole groups in the battery jar and sealing the back cover; 5, welding a splicer in front of the pole groups and sealing the front cover; and 6, filling an electrolyte.

The invention relates to a method for detecting the skin burn depth based on unilateral nuclear magnetic resonance sensing equipment, and belongs to the field of nuclear magnetic resonance detection. The structure of the unilateral nuclear magnetic resonance sensing equipment mainly comprises a permanent magnet structure, a radio-frequency coil, a gradient coil and a radio-frequency shielding device. The gradient coil conducts spatial encoding; a natural gradient perpendicular to the surfaces of magnets is taken as a selective layer gradient according to the characteristics of a magnetostatic field formed by the unilateral magnets, bi-phase encoding is conducted instead of frequency encoding, and according to the difference of the skin longitudinal relaxation time T1, the skin transverse relaxation time T2 and the diffusion coefficient D measured through obtained magnetic resonance signals, the skin burn depth can be detected. According to the method, the characteristic that the magnetostatic field formed by the unilateral magnets has a longitudinal gradient is fully utilized, and thus the loss of radio frequency energy is reduced; the defect that the signal-to-noise ratio is low is overcome with an accumulation method, signals are constantly restored with a series of 180-degree refocused pulses, and the signal-to-noise ratio can be increased after the signals are superposed and averaged.

The invention discloses a battery heating control device and a heating control method. The heating control device comprises at least three heating modules, at least three temperature detection modules, a control module and first switches, wherein the heating modules are in one-to-one correspondence with battery cell groups, and the heating modules heat battery cells in the corresponding battery cell groups when being started; the temperature detection modules are in one-to-one correspondence with the battery cell groups, and the temperature detection modules are used for detecting a real-timetemperature of the battery cells in the corresponding battery cell groups and generating temperature detection signals; the first switches are arranged corresponding to the heating modules; and the control module adjusts a starting state of the corresponding heating modules through the first switches according to the temperature detection signals and a received external power supply signal, and adjusts heating power of the corresponding heating modules through the first switches according to the received temperature detection signals so as to make a temperature difference value between the battery cell group with a maximum temperature and the battery cell group with a minimum temperature be less than or equal to a set difference value. Through the technical scheme of the invention, consistency of the battery cell temperatures is improved.

The invention discloses a preparation method of a lithium-sulfur battery anode material, and relates to the technical field of lithium-sulfur batteries. The preparation method comprises the following steps of 1 cotton dipping , wherein cotton is soaked in a hydrochloric acid solution containing zinc chloride for sealed heat preservation, the redundant solution is removed, and a mixture is dried and subjected to heat preservation treatment to obtain gray or brown solids; 2 porous carbon matrix preparing, wherein carbonization treatment and acidification treatment are conducted on the solids in sequence, and then washing, drying and calcining are conducted to obtain a porous carbon matrix; 3 carbon-sulfur composite material preparing, wherein the porous carbon matrix and elemental sulfur are heated together to synthesize the lithium-sulfur battery anode material. The invention further discloses the lithium-sulfur battery anode material prepared through the method and a lithium-sulfur battery. Compared with the prior art, the lithium-sulfur battery anode material obtained through the method has the advantages of being high in sulfur loading amount and capacity, good in cycle performance, simple in process and low in cost.

The invention relates to a backward reflecting modulation tag with light as a medium and a reader-writer system. A tag body and a reader-writer are included. The tag comprises a thin film solar cell panel which is used for obtaining energy from light emitted by the reader-writer and ambient light, a backward reflecting thin film for backward reflecting, a liquid crystal light valve for carrying out modulation on light reflecting, a liquid crystal light valve modulation circuit and a first photosensitive diode for receiving reader-writer signals. The liquid crystal light valve adheres to the backward reflecting thin film. The reader-writer comprises an LED for emitting visible light or infrared light, an LED driving and modulation circuit, a microcontroller, and a second photosensitive diode. The backward reflecting modulation tag has the advantages that the passive tag-tag reader-writer system with light as the medium is provided, through the backward reflecting features of the backward reflecting thin film on light, compared with radio-frequency signals, the decay rate is greatly lowered, the tag body uses the thin film solar cell, reading-writing distance is improved, and the power consumption of the reader-writer is lowered.

The invention relates to the field of heat conducting equipment, in particular to a superconductive heat pipe and a heat transfer medium thereof, and solves such problems as easy corrosion, weak pressure resistance and short service life of superconductive heat pipes in the prior art. The superconductive heat pipe comprises a vacuum heat conducting pipe and the heat transfer medium, wherein the heat transfer medium is positioned in an inner cavity of the vacuum heat conducting pipe, and comprises the following substances: 1-3 parts of zinc permanganate, 3-8 parts of magnesium chloride, 5-15 parts of sodium tetraborate, 3-8 parts of potassium dichromate, 2-8 parts of ferrous chloride, 2-6 parts of strontium chloride, and 800-1000 parts of water. The superconductive heat pipe has the advantages of high conduction efficiency, stable performance and good energy saving effect, and is suitable for promotion and application.

The invention discloses an injection-production process for prolonging the service life of a coalbed methane production well group by injecting carbon dioxide, and belongs to the technical field of coalbed methane development. The method comprises the following steps: selecting a coalbed methane production well group which has produced continuously, taking a central well as a CO2 injection well and a peripheral well as a gas recovery well, and utilizing the displacement and replacement effects of CO2 on CH4 to improve the daily gas production rate of the gas recovery well and prolong the service life of the coalbed methane production well group; in the step-type injection increasing and pressure increasing stage, the bottom hole pressure of the CO2 injection well is rapidly increased in a step-type daily injection rate increasing mode; in the pressure-limiting injection displacement stage, the bottom hole pressure of the CO2 injection well is maintained to be lower than the minimum principal stress of the coal reservoir; in the gas-driven water energy generation inhibition stage, inhibition of gas-driven water on gas production of a gas recovery well is eliminated by increasing the stroke frequency of a pumping unit; cO2 is injected for displacement in the yield increasing stage of the gas recovery well, and CH4 is replaced, so that the yield increasing effect of the gas recovery well gradually appears; in the intermittent drainage and mining stage, the concentration of CO2 in produced gas is inhibited from exceeding the limit by irregularly shutting in the well; in the well site reclamation stage of the gas recovery well, the liquid CO2 is continuously injected by closing the gas recovery well, and continuous storage of CO2 in the well group range is achieved.

The invention discloses a reflection plate fixed condensation heat collection device adopting a rotating rod type adjusting receiver. The reflection plate fixed condensation heat collection device comprises a main reflection plate, a rotating rod module and a receiver module, wherein the rotating rod module comprises a supporting rod, a rotating rod, a rotating shaft, a receiver fixing frame, a balancing weight and a power device, the rotating rod is connected with the upper end of the supporting rod through the rotating shaft, the rotating shaft is connected with a power device, and the power device drives the rotating shaft and the rotating rod to rotate; the two ends of the rotating rod are connected with the receiver fixing frame and the balancing weight correspondingly. and an adjustable base is arranged below the main reflection plate, and a greenhouse room is arranged outside the main reflection plate, the rotating rod module and the receiver module. The reflection plate fixed condensation heat collection device adopting the rotating rod type adjusting receiver has the advantages of few rotating parts, high solar energy utilization rate per unit occupied area, good wind resistance, high device stability, low construction and maintenance cost and light weight.

The invention provides a method for parallel production of sugarcane concentrated juice and sugarcane drinking water by multi-stage films. The method comprises the steps as follows: enabling sugarcanes to be subject to blanching enzyme deactivation, pressing and juice extracting and crude filtering sequentially, to obtain crudely filtered sugarcane juice; ultra-filtering and cleaning the crudely filtered sugarcane juice by a first ceramic film to obtain clear sugarcane juice; concentrating the clear sugarcane juice by an organic nano-filtration film to obtain a nano-filter clear solution and a nano-filter concentrated solution; ultra-filtering the nano-filter concentrated solution by a second ceramic film, sterilizing and filling sterilely to obtain the sugarcane concentrated juice; purifying the nano-filter clear solution by an organic reverse osmosis film to obtain a reverse osmosis clear solution; ultra-filtering and sterilizing the reverse osmosis clear solution by a third ceramic film, and filling sterilely to obtain the sugarcane drinking water. Based on the integration of film process separation, concentration, cold sterilizing and other functions, the high-quality sugarcane concentrated juice and sugarcane drinking water are produced in parallel with sugarcanes as a raw material, and the optimization of products and comprehensive utilization of sugarcane resource are prompted.

The invention provides an OLED life attenuation compensation method and a method for driving an OLED display. According to the OLED life attenuation compensation method, in the initial stage of decrease in the attenuation coefficient of OLED pixels, compensation is made for the OLED pixels at a high initial value of compensation to increase the attenuation coefficient to a high target value of compensation, and then, the initial value of compensation and the target value of compensation are gradually lowered so that compensation can be made for the OLED pixels at a low initial value of compensation after multiple times of compensation to increase the attenuation coefficient to a low target value of compensation. Therefore, the attenuation of OLED pixels is delayed, and the compensation effect of OLED life attenuation is improved.

The invention relates to a control method capable of slowing down transmit power attenuation of an elevator light curtain. The control method includes following specific steps that S1, an interlockingsignal of an elevator door is detected by a control circuit to determine whether or not the elevator door is closed for 2 seconds or above; S2, if the elevator door is closed for less than 2 seconds,the elevator light curtain works normally, if the elevator door is closed for greater than 2 seconds, the elevator light curtain stops working, and a power test unit on the control circuit performs testing on transmit power of each transmitting unit of the elevator light curtain one by one; S3, the smallest power value obtained by the testing is used as a calibration parameter; S4, based on the smallest transmit power calibration value of the control circuit, the optimal amplification factor of a receiving digital amplifier circuit is calculated to amplify an infrared receive signal. The control method automatically inspects the power of an infrared emitting tube in real time, and automatically adjusts the parameters of the receiving amplifier circuit according to the attenuation degree of the infrared emitting tube to greatly improve the life cycle of products.

The embodiment of the invention discloses a risk control model construction method and device, a storage medium and a terminal. The method comprises the steps of obtaining historical data of at leastone user in a preset time period; extracting at least one type of first feature information related to the historical data; for each type of first feature information, sorting the first feature information in the historical data according to a preset sorting rule to generate a first feature information sequence; determining a first arrangement quantile of the first feature information in the firstfeature information sequence; and training a preset machine learning model based on the first arrangement quantile to generate a risk control model. By adoption of the technical scheme, the corresponding feature information is replaced with the arrangement quantiles of the feature information in the historical data; and model training is performed based on the arrangement quantiles of the featureinformation to generate a risk control model, so that the constructed risk control model can achieve a dynamic self-adaptive effect on the change of the input data, and the attenuation speed of the risk control model along with time is effectively reduced.

The invention discloses a reflector seasonal adjustment type light-gathering and heat-collecting device. The reflector seasonal adjustment type light-gathering and heat-collecting device comprises a main reflector, a rotating rod module, a reflector supporting and adjusting module and a receiver module, wherein the rotating rod module comprises a supporting rod, a positioning cross rod, a rotating shaft, a rotating rod, a receiver fixing frame, a balancing weight and a power device; the reflector supporting and adjusting module comprises a rotating frame, an angle adjusting and fixing device and an adjustable reflector supporting frame; and the upper end of the rotating frame is connected to the positioning cross rod, the rotating frame can rotate around the positioning cross rod, and a greenhouse is arranged outside the main reflector, the rotating rod module, the reflector supporting and adjusting module and the receiver module. The reflector seasonal adjustment type light-gathering and heat-collecting device has the advantages that the number of rotating components is small, the solar energy utilization rate of the unit occupied area is high, the light-gathering effect is excellent, the wind resistance is good, the stability of the device is high, the construction and maintenance cost is low, and the weight is low.

The invention provides a battery pack, which comprises a cell assembly and a heat dissipation component, wherein the cell assembly comprises a cell array and a gap arranged in the cell array; the cellarray is formed by arranging a plurality of cells in sequence; the gap is enclosed by N cells; N is greater than 2; the heat dissipation component comprises a heat absorption element arranged in thegap; the heat absorption element comprises N side walls; and the N side walls are propped against the side walls of the N cells separately. Compared with the prior art, the battery pack provided by the invention has the advantages that the battery pack assists the cell assembly in heat dissipation through the heat dissipation component, so that the temperature of various regions of the cell assembly can be relatively balanced, the working time of the cell assembly can be effectively prolonged and the decay rate of the cell assembly is reduced, thereby effectively prolonging the service life ofthe battery pack.

The invention discloses an organic electroluminescence device. The organic electroluminescence device comprises a glass substrate, a scattering layer, a positive pole, a hole-injection layer, a hole-transmission layer, a light-emitting layer, an electronic transmission layer, an electronic injection layer and a negative pole which are sequentially overlapped, wherein the scattering layer comprises a metal oxide layer, a light-emitting material layer and an iron salt layer; the HOMO energy level of the material of the metal oxide layer is between -5.2 eV and -6.0 eV; the material of the light-emitting layer is selected from one and more of 4-(dicyanomethyl)-2-butyl-6-(1,1,7,7-tetramethyljulolidine-9-ethenyl)-4H-pyran, 9,10-di-beta-naphthyl anthracene, 4,4'-di(9-ethyl-3-vinylcarbazole)-1-1'-biphenyl and 8-hydroxyquinoline aluminum; the material of the iron salt layer is selected from one and more of iron chloride, iron bromide and iron sulfide. The organic electroluminescence device is relatively high in light-emitting efficiency. The invention also provides a manufacturing method for the organic electroluminescence device.

The invention relates to the field of biotechnology, and develops a method for homogenizing concentrations of different oligonucleotides in an oligonucleotide library and amplifying the oligonucleotide library at a normal temperature. The method can be applied to DNA data storage. The method can homogenize the concentrations of the different oligonucleotides, and can also improve the purity of oligonucleotide fragments. According to a strand displacement amplification technique, the oligonucleotide library can be amplified at a constant temperature, and an amplified product is ssDNA with a phosphate group, so that great convenience is brought to library preparation in subsequent second-generation sequencing. Nickase required in an SDA reaction has a long recognition sequence, which makes data coding easier. In addition, the amplification method is a linear amplification method in which a most original template is used for amplification, so that mutation is not amplified as compared toPCR, and multiple rounds of amplification can be performed.

The invention belongs to the technical field of vitamins, and particularly relates to a fat-soluble vitamin composition and a preparation method thereof. The fat-soluble vitamin composition provided by the invention is prepared from the following components in parts by mass: 0.05 to 5 parts of fat-soluble vitamin; 5 to 80 parts of an oil phase; 5 to 50 parts of an emulsifier; 0.1 to 10 parts of an antioxidant; 5-60 parts of a co-emulsion, wherein the emulsifier is colloidal silicon dioxide. The invention also provides the preparation method which comprises the following steps: mixing the fat-soluble vitamin and the oil phase to prepare a first mixture; mixing the antioxidant, the co-emulsion, the emulsifier and water to prepare a second mixture; and mixing the first mixture and the second mixture, and then drying and sieving to obtain the fat-soluble vitamin composition. According to the fat-soluble vitamin composition and the preparation method thereof, the technical problems of low uniformity and easiness in oxidation and degradation in the existing fat-soluble vitamin compound product can be effectively solved.

The invention discloses a follow-up recycling device for wood chips. The follow-up recycling device comprises a pipeline, a rotational flow cover, a motor, a fan chamber and a storing cabin. The rotational flow cover comprises a guiding pipe and multiple tangential guiding pipes; one end of the guiding pipe movably communicates with one end of the pipeline; and the multiple tangential guiding pipes are evenly and annularly distributed on the outer side wall of the guiding pipe and communicate with the guiding pipe, and each tangential guiding pipe tangentially stretches out at the position, where the corresponding tangential guiding pipe is fixed, of the guiding pipe in the clockwise surrounding direction. The motor drives the guiding pipe to rotate relative to the pipeline. A fan in the fan chamber sucks the multiple tangential guiding pipes through the pipeline, and a tornado sucked into the guiding pipe is formed under rotation of the guiding pipe. The storing cabin is installed atthe bottom of the fan chamber, communicates with the fan chamber and is used for storing the wood chips sucked into the fan chamber. According to the follow-up recycling device for the wood chips, anactual product can well suck the wood chips and can shield flying of the wood chips when the actual product works, the cleanliness of the working environment of a wood processing site is guaranteed, and the follow-up recycling device for the wood chips has the advantages of being good in wood chip suction effect and high in safety and practicability.

The invention discloses an organic electroluminescence device which comprises a glass substrate, a scattering layer, an anode, a hole injection layer, a hole transmission layer, a light emitting layer, an electron transfer layer, an electron injection layer and a cathode which are overlapped in sequence, wherein the scattering layer consists of a first light emitting material layer, a metallic oxide doped layer and a second light emitting material layer; the first light emitting material layer and the second light emitting material layer are made of a same material selected from at least one of 4-(dinitrile methyl)-2-butyl-6-(1,1,7,7-tetramethyljulolidine-9-vinyl)-4H-pyran, 9,10-di-beta-naphthylene anthracene, 4,4'-di(9-ethyl-3-carbazole vinyl)-1,1'-biphenyl and 8-hydroxyquinoline aluminum; the metallic oxide doped layer comprises a first metallic oxide and a second metallic oxide doped in the first metallic oxide. The organic electroluminescence device disclosed by the invention is relatively high in light emission efficiency. The invention further provides a preparation method of the organic electroluminescence device.

The invention discloses a preparation method of an environment-friendly liquid brushing type negative ion diatom ooze coating, and relates to a preparation method of a diatom ooze coating. The invention aims to solve the problems that existing diatom ooze coatings easily cause an indoor secondary pollution source and pores of diatomite are easily blocked. The method comprises the following steps: preparing a negative ion diatom ooze powder by taking nano tourmaline, a nano rare earth material, nano titanium dioxide, superfine calcium stearate, superfine talcum powder and superfine diatomite as raw materials, stirring and dispersing a defoaming agent, a thickening agent, a dispersing agent and water, adding the negative ion diatom ooze powder with stirring, and then adding acrylic resin dispersion, a coalescing agent, the defoaming agent and single-layer graphene. The coating disclosed by the invention is high in negative ion release concentration, and can achieve the effects of removing harmful gases such as formaldehyde and benzene for a long time, purifying indoor air, resisting bacteria, preventing mildew and resisting aging. The method is suitable for preparing the diatom ooze coating.

The invention discloses an iron and nickel-doped activated carbon-sulfur material. The iron and nickel-doped activated carbon-sulfur material is obtained by activating an inorganic nickel salt, an inorganic iron salt, activated carbon and sulfur as raw materials through a hydrothermal method, a liquid-phase in-situ composite method and a melting method. The preparation method comprises the following steps of (1) preparing iron and nickel-doped activated carbon powder through the hydrothermal method; (2) preparing an unactivated iron and nickel-doped activated carbon-sulfur material through theliquid-phase in-situ composite method; and (3) activating the iron and nickel-doped activated carbon-sulfur material. The iron and nickel-doped activated carbon-sulfur material is used as a positiveelectrode of a lithium-sulfur battery; when the current density is 167.5mA / cm<2>, the initial specific discharge capacity is 1,000-1100mAh / g; and after 100 cycles, the specific capacity is reduced to500-550mAh / g. The iron and nickel-doped activated carbon-sulfur material has the advantages that (1) the sulfur content is greatly improved; (2) dissolution of one part of polysulfide is successfullyinhibited; and (3) component distribution is uniform, negative electrode corrosion and internal resistance increase of the battery caused by the shuttle effect are effectively inhibited, and the effects of providing the specific discharge capacity, reducing the battery capacity attenuation rate and improving the cycle performance are achieved.