1549results about "Silicon" patented technology

The invention discloses a carbon-silicon negative electrode material and a preparation method and application thereof, and the preparation method comprises the following steps: S1, carrying out mixed reaction on a lithium source compound, a lanthanum source compound and a titanium source compound to obtain a mixed reactant; mixing the mixed reactant with a carbon source compound, and dispersing and emulsifying to obtain element-doped microspheres; s2, carbonizing the element-doped microspheres in the step S1 to obtain carbides, and activating the carbides to obtain a porous carbon material; and S3, performing silicon deposition on the porous carbon material in the S2 to obtain silicon deposition porous carbon, and performing carbon deposition on the silicon deposition porous carbon to obtain the carbon-silicon negative electrode material. The carbon-silicon negative electrode material disclosed by the invention is high in lithium ion transmission rate, the problem of poor electronic conductivity of silicon is solved, and the electrical property of a battery can be effectively improved.

The present invention provides a negative electrode active material which has negative electrode active material particles, the negative electrode active material being characterized in that: the negative electrode active material particles each include a porous carbon structure; amorphous low valence nano silicon oxide is dispersed inside the porous carbon structure; the low valence nano silicon oxide includes the states where SiOx:x < 1.0 is satisfied; and the low valence nano silicon oxide has an average particle diameter of 50 nm or less as determined by image processing of a cross-sectional TEM image thereof. As a result, a negative electrode active material which is capable of increasing the capacity while maintaining the battery characteristics is provided.

The present invention relates to a porous silicon-carbon composite having a core-shell structure, a preparing method therefor, and an anode active material comprising same, wherein the core comprises silicon particles and the shell comprises two or more carbon layers including a first carbon layer and a second carbon layer, so that the application of the composite as an anode active material for a secondary battery can enhance the discharge capacity, initial efficiency, and capacity retention rate of the secondary battery. In addition, the preparing method for the porous silicon-carbon composite having the core-shell structure enables the mass production through a continuous process with minimized steps.

The invention discloses a preparation method of a silicon-carbon material for a negative electrode of a lithium ion battery, and relates to the technical field of lithium ion batteries, and the preparation method comprises the following steps: (1) selecting a specific silicon source solute and an organic solvent to prepare an organic silicon source solution; (2) selecting porous carbon as a substrate, and carrying out vacuum impregnation treatment in a silicon source solution; (3) carrying out solvothermal silicon deposition reaction on the porous carbon impregnated with the silicon source solution in a high-pressure reaction kettle; (4) carrying out vacuum impregnation on the deposited silicon porous carbon subjected to solvent heat treatment in a carbon source organic solvent; and (5) cracking and carbonizing the deposited silicon porous carbon impregnated with the carbon source solvent at a high temperature to form the composite silicon carbon material with carbon-coated silicon crystal particles. According to the present invention, the energy density of the lithium ion battery negative electrode material is improved while the cycle life and the rate capability are significantly improved, such that the prepared silicon-carbon material has excellent electrochemical performance, and can well meet the application requirements of the lithium ion battery on the aspects of high energy density, long cycle life, high-rate charge-discharge and the like.

The invention relates to a preparation method and application of a composite porous carbon-based negative electrode material with soft carbon coated with hard carbon. The preparation method comprises the following steps: (S1) carbonizing and activating a soft carbon material precursor to obtain soft carbon core particles; (S2) carrying out graft modification on the oxidized soft carbon inner core particles through dopamine polyethylene glycol silane, and then carrying out in-situ copolymerization reaction on the modified soft carbon inner core particles and dopamine to obtain organic silicon-polydopamine coated soft carbon composite particles; (S3) carrying out in-situ polymerization of phenolic aldehyde on the surfaces of the composite particles to form phenolic aldehyde coated soft carbon composite particles; (S4) carbonizing and activating the phenolic aldehyde coated soft carbon composite particles to obtain hard carbon coated soft carbon composite porous carbon; and (S5) carrying out silicon deposition and carbon coating on the composite porous carbon to obtain the composite porous carbon-based negative electrode material with soft carbon coated with hard carbon. When the composite porous carbon-based negative electrode material with the soft carbon coated with the hard carbon prepared by the invention is applied to a negative electrode of a lithium battery, the composite porous carbon-based negative electrode material has good electrochemical performance, and particularly has excellent cycle performance and compression resistance.

The invention provides a silicon-carbon negative electrode material and a preparation method thereof, a negative electrode plate, an electrode and an electric device, and relates to the field of batteries. The silicon-carbon negative electrode material comprises porous carbon and silicon particles attached to the pore walls of the porous carbon, crystalline phases exist in the silicon particles, the crystallinity of the silicon particles is at least 90%, and the average grain size of the silicon particles is smaller than 4 nm. According to the silicon-carbon negative electrode material, the battery can obtain relatively good cycling stability and high initial coulombic efficiency at the same time.

The invention provides a negative electrode material and a preparation method thereof. The negative electrode material comprises an inner core and a coating layer coating the surface of the inner core, the inner core comprises a porous carbon matrix and amorphous nano silicon particles dispersed in the porous carbon matrix; pores in the porous carbon matrix comprise micropores, the pore diameter of the micropores is less than 2nm, and the quantity of the micropores accounts for more than or equal to 80% of the total quantity of the pores. According to the negative electrode material, a silicon-carbon material core is coated with a coating layer, and the number of micropores in a porous carbon matrix is adjusted, so that on one hand, direct contact reaction between high-activity nano silicon and an electrolyte is effectively avoided; and on the other hand, the particle size of the amorphous nano silicon particles in the negative electrode material is relatively small, the dispersity in the porous carbon matrix is relatively good, and the negative electrode material has relatively low expansion rate and relatively high initial coulombic efficiency, rate capability and cycle performance.

The present invention is a negative electrode active material comprising negative electrode active material particles. The negative electrode active material is characterized in that: the negative electrode active material particles include porous carbon structures; silicon and a silicon oxide are dispersed in the interiors of the porous carbon structures; a low-valent nanosilicon oxide in an amorphous state is dispersed in at least surface-layer portions of the interiors of the porous carbon structures; the low-valent nanosilicon oxide is SiOx, where x is less than 1.0; and nanosilicon with a crystalline structure is dispersed at least in deep layer portions of the interiors of the porous carbon structures, such portions being deeper than where the low-valent nanosilicon oxide is dispersed. Due to this configuration, it is possible to provide a negative electrode active material that can increase capacity while maintaining battery characteristics.

The invention belongs to the field of electrochemistry, and discloses a silicon-carbon negative electrode material based on nanocellulose and a preparation method and application thereof. The preparation method comprises the following steps: dispersing cellulose in deionized water, and carrying out physical stripping and ionic liquid assisted acidolysis to obtain a cellulose colloidal solution; and dispersing the conductive agent and the carbon source into the colloidal solution, adding the coupling agent and the silicon source, and carrying out spray drying and sintering. According to the invention, nano cellulose preparation and silicon carbon preparation processes are combined, so that an intermediate separation process is reduced, and the process is simplified. Meanwhile, in the silicon-carbon balling process, the ionic liquid and the coupling agent in the slurry can induce and promote surface combination of the carbon source and the silicon source; the nano cellulose promotes nano-micro forming of components such as silicon and carbon, and is coupled with the conductive agent in the carbonization process to form an internal conductive network and a coating layer; in the carbonization process, hydrolysis catalyst metal ions play a role in catalyzing gas source cracking deposition to form a stable coating carbon layer. The silicon-carbon material is novel in route, rapid electron transmission and capacity exertion are guaranteed through the conducting layers from inside to outside, and the cycling stability of the material can be improved through the multi-carbon-layer coating structure.

The invention relates to the field of battery materials, in particular to a preparation method and application of a modified porous carbon material for nano silicon CVD (chemical vapor deposition). According to the invention, the non-porous two-dimensional lamellar material is self-assembled on the porous carbon material, so that the modified porous carbon material for CVD deposition of nano-silicon is obtained, when high-speed carrier gas passes through the surface of the porous carbon material, the two-dimensional lamellar material on the surface of the porous carbon material is stressed intensively, and is not dispersed due to a pore channel structure on the surface of the porous carbon material; therefore, under the same fluidization condition, the modified porous carbon material shows better fluidization characteristics, deposition of nano silicon is more uniform after silane or organic gas is subsequently introduced, the content of floating silicon on the surface is extremely low, silicon enrichment can be reduced while the capacity of the negative electrode material is ensured, and the service life of the negative electrode material is prolonged. Furthermore, the electrochemical performance of the obtained nano silicon-carbon composite negative electrode material is more prominent, and the performance stability of negative electrode materials produced in different batches is also good.

The present invention relates to a silicon-carbon composite, a preparation method therefor, and an anode active material comprising same. The silicon-carbon composite includes silicon particles, silicon oxides, magnesium compounds, and carbon. As a molar ratio (O / Si) of oxygen (O) atoms to silicon (Si) atoms in the silicon-carbon composite satisfies 0.01 to 0.60, when the silicon-carbon composite is applied to an anode active material, the discharge capacity, initial efficiency, and capacity retention ratio after cycles of a lithium secondary battery may be simultaneously improved.

The invention belongs to the technical field of batteries, and particularly relates to a porous carbon material, a silicon carbon material, a secondary battery and an electric device. The porous carbon material comprises carbon particles, the carbon particles have a porous structure, the porous structure comprises mesopores and micropores, and the number of the mesopores is not less than that of the micropores; the volume distribution particle size of the carbon particles meets the condition that Dv1 is greater than or equal to 0.5 mu m, and the specific surface area of the porous carbon material is 1,400 m < 2 > / g to 1,800 m < 2 > / g. The porous carbon material provided by the invention has a suitable porous structure, the number of micropores and mesopores in the porous structure is controllable, the content of a silicon material formed in the porous structure and the size of silicon crystal grains can be conveniently controlled, and a part of volume space for buffering the expansion of the silicon material can be reserved to improve the cyclicity of a battery; on the other hand, micro-powder particles attached to the surfaces of the carbon particles are reduced, the volume distribution particle size concentration ratio of the carbon particles is improved, and the number of cycles of the battery is increased.

The invention relates to the technical field of lithium ion batteries, in particular to a lithium-doped silicon-carbon composite material, a preparation method thereof, a negative plate and a lithium ion battery. The preparation method of the lithium-doped silicon-carbon composite material comprises the following steps: carrying out reduction reaction and activated pore-forming on a mixed material containing a carbon source, an organic pore-forming agent, a lithium supplement agent and a reducing agent to obtain lithium-doped porous carbon; performing first deposition on the lithium-doped porous carbon and mixed gas containing an inorganic lithium compound and an organic lithium compound; carrying out second deposition on the material obtained after the first deposition and silane gas to obtain a lithium compound doped silicon carbon precursor material; and mixing the lithium compound doped silicon carbon precursor material, an organic metal compound, asphalt and an organic solvent, performing spray drying, and then performing carbonization. According to the preparation method, the initial efficiency and the power performance of the silicon-carbon composite material can be improved.

The invention relates to the technical field of batteries, in particular to a porous carbon material, a silicon-carbon composite material and application of the porous carbon material and the silicon-carbon composite material. According to the porous carbon material, the micropore rate phi, the pore volume Pv and the compressive strength Cs meet the relational expression that (Cs * phi) / Pv is larger than or equal to 550 and smaller than or equal to 1050, and the micropore rate phi gt; and the compressive strength Cs is 600 to 850 MPa. The porous carbon material provided by the invention has high microporosity, and the microporosity phi, the pore volume Pv and the compressive strength Cs of the porous carbon material meet the relation that (Cs.phi) / Pv is more than or equal to 550 and less than or equal to 1050, so that the particle size of silicon particles can be effectively reduced, the absolute expansion of silicon in a carbon matrix is reduced, and the first effect and the cycling stability of the silicon-carbon composite material are improved.

A silicon-carbon negative electrode material, which comprises a core and a shell, wherein the core comprises a porous carbon skeleton and silicon, which is dispersed in pores of the porous carbon skeleton. Carbon nanotubes are wrapped in and dispersed in the porous carbon skeleton; the content of silicon element in the silicon-carbon negative electrode material is 25 to 55 wt%; and the shell comprises a carbon material. In a linear scanning electron microscope energy spectrum of a cross section of the silicon-carbon negative electrode material, the standard deviation of the content change of silicon element does not exceed 200 in the direction from the center to the edge of the cross section. Provided are an electrochemical device and a preparation method for the silicon-carbon negative electrode material.

The invention relates to a graphite silicon carbon composite negative electrode material, a negative electrode plate and a lithium ion battery, and belongs to the technical field of battery negative electrode materials. The graphite silicon carbon composite negative electrode material comprises a graphite inner core and a composite shell layer, the composite shell layer coats the surface of the inner core, the composite shell layer comprises a continuous carbon layer, the carbon layer is of a porous structure, and the porous structure is filled with nano silicon particles. According to the core-shell structure, through a three-stage synergistic mechanism of graphite inner core conductive supporting, porous carbon layer expansion buffering and nanometer silicon capacity contribution, the cycling stability of the negative electrode material is remarkably improved while the high specific capacity is maintained.

Performance is improved. There is provided a negative electrode material for a battery, in which the negative electrode material includes carbon, sodium tungstate, and silicon particles 33 including silicon, and in the silicon particle 33, a ratio of the amount of Si in Si2p derived from elemental silicon to the amount of Si in Si2p derived from SiO2 in a surface layer when measured by X-ray photoelectron spectroscopy is 3 or more on an atomic concentration basis.

The invention discloses a lithium ion battery silicon-carbon composite negative electrode material and a preparation method and application thereof.The lithium ion battery silicon-carbon composite negative electrode material comprises a rigid three-dimensional porous carbon skeleton, elastic carbon and nanometer silicon, and three-dimensional holes are formed in the rigid three-dimensional porous carbon skeleton; three-dimensional holes formed by the rigid three-dimensional porous carbon skeleton are filled with the elastic carbon and the nano silicon, the rigid three-dimensional porous carbon skeleton is obtained by carbonizing polyurethane foam with a through three-dimensional porous structure, and the elastic carbon is obtained by carbonizing a carbon source. The rigid three-dimensional porous carbon skeleton has a submicron-scale three-dimensional through hole structure, and the pore channel structure is filled with elastic carbon and nano silicon. Through the synergistic confinement effect of the rigid three-dimensional carbon skeleton and the elastic carbon, the volume expansion / shrinkage problem of the nano silicon is buffered, and the elastic carbon cannot be broken due to the volume change of the nano silicon. The lithium ion battery prepared by the method has the advantages of high specific capacity, cycling stability and the like, and has a potential application prospect in high-specific-energy lithium ion batteries.

The invention discloses an atomization control method and device in a reduction furnace and a training method and device of a target model, and relates to the technical field of new energy. The atomization control method in the reduction furnace comprises the steps that real-time parameters in a target reduction furnace are obtained, the real-time parameters comprise at least one of N first-class real-time parameters in one-to-one correspondence with N different moments in a current polycrystalline silicon growth cycle and second-class real-time parameters at the current moment, and N is a positive integer; a target model corresponding to the real-time parameters is utilized to predict the real-time parameters, a first prediction result is obtained, and the target model comprises at least one of a target atomization trend prediction model and a target atomization state prediction model; and determining a target control strategy according to the first prediction result, and executing the target control strategy. According to the embodiment of the invention, the method can improve the quality of the polycrystalline silicon in the process of preparing the polycrystalline silicon.

The invention belongs to the field of lithium battery negative electrode materials, and particularly relates to a TiO2 (at) SiO (at) Si / RGO silicon-based negative electrode material and a preparation method and application thereof. The silicon-based negative electrode material comprises RGO with a three-dimensional skeleton structure and TiO2 (at) SiO (at) Si particles compounded on the RGO, each TiO2 (at) SiO (at) Si particle comprises a Si inner core, a SiO layer coated on the surface of the Si inner core and a TiO2 layer coated on the surface of the SiO. The preparation method is characterized in that a TiO2 (at) SiO (at) Si / RGO silicon-based negative electrode material with a specific structure is designed and synthesized, SiO and TiO2 double-layer coating is carried out on a Si core in sequence, and TiO2 (at) SiO (at) Si particles are uniformly compounded on RGO with a three-dimensional skeleton structure, so that the TiO2 (at) SiO (at) Si / RGO silicon-based negative electrode material with a specific structure is obtained. The obtained TiO2 (at) SiO (at) Si / RGO silicon-based negative electrode material not only can effectively inhibit volume expansion when the silicon-based negative electrode material is applied to a lithium ion battery, but also is beneficial to promoting electron transfer, so that the rate capability, the first effect performance and the cycle performance of the silicon-based negative electrode material are improved.

The invention provides a negative electrode material, a preparation method thereof and a lithium ion battery, and relates to the technical field of lithium ion batteries. The negative electrode material comprises a silicon-based material core and a coating layer formed on at least part of the surface of the silicon-based material core, wherein the coating layer has a pore structure; the differential pore structure ratio delta phi of the negative electrode material meets # imgabs0 #, wherein delta S is the area of a hysteresis loop in an isothermal adsorption and desorption curve of the negative electrode material; s is the specific surface area of the negative electrode material; delta P is the interval difference value of the relative pressure P / P0 corresponding to the hysteresis loop; qmax is the maximum isothermal adsorption capacity of the negative electrode material. The preparation method of the negative electrode material comprises the step of carrying out CVD (Chemical Vapor Deposition) treatment on a to-be-coated silicon-based material core to obtain the negative electrode material of which the coating layer has a pore structure. The coating layer with a special pore structure is arranged on the negative electrode material, so that the rate capability and the cycle performance of the material are improved.

The invention belongs to the field of negative electrode materials, and particularly relates to a silicon-graphite composite material, a preparation method and application thereof and a lithium ion battery, the preparation method comprises the following steps: mixing and slurrying silicon powder, graphite and a composite functional additive, and then carrying out ball milling modification to obtain primary composite particles; the composite functional auxiliary agent comprises an auxiliary agent A, an auxiliary agent B and an auxiliary agent C; the primary composite particles and a carbon source liquid phase are compounded and then subjected to spray drying and heat treatment, or spray pyrolysis is directly carried out, and secondary composite particles are prepared; and carrying out modification treatment on the secondary composite particles prepared in the step 2 in a surface modification liquid, and then carrying out low-temperature annealing at 150-300 DEG C to prepare the silicon-graphite composite material. The surface modification liquid is an organic solution in which conductive lithium salt and an auxiliary agent D are dissolved. Based on the combined control of the preparation process and the structure, the silicon-based negative electrode material with ultra-long cycle life and excellent low-temperature fast charging performance can be obtained.

The invention specifically discloses porous carbon, a silicon carbon material, a preparation method and application of the silicon carbon material in a lithium ion battery. The porous carbon material with high aperture order degree is prepared by taking phenol metal salt as a carbon source through an in-situ template method, and the novel silicon carbon material is prepared by taking the porous carbon material as a substrate through vapor deposition. The porous carbon prepared by the method has the advantages of high microporosity, uniform pore diameter, high order degree and the like, and when the porous carbon is used for further preparing a silicon-carbon material by chemical vapor deposition, the diffusion resistance of silane gas in the porous carbon material is smaller, so that the silicon deposition efficiency is improved, and meanwhile, the service life of the silicon-carbon material is prolonged. The silicon particles can be uniformly dispersed and fixed in the porous carbon pore channel structure, aggregation of the silicon particles is avoided, nucleation and growth of the silicon particles can be effectively controlled through the limiting effect of the pore channel size of the micropores, and the silicon particles with the uniform size are prepared. When the silicon-carbon material is applied to the lithium ion battery, the electrochemical performance of an electrochemical device comprising the silicon-carbon negative electrode material is favorably improved.

The invention belongs to the technical field of lithium ion batteries, and particularly relates to a preparation method of a graded ordered silicon-carbon negative electrode material for a lithium ion battery, which comprises the following steps: (S1) mixing phenolic resin and a template agent, calcining, and etching to obtain porous carbon containing macropores; (S2) carrying out cracking and carbon coating on the silicon source gas to obtain nano crystalline silicon containing a carbon coating layer; (S3) mixing the porous carbon with the nano crystalline silicon containing the carbon coating layer, and then carrying out ultrasonic vibration, so that macropores of the porous carbon are filled with the nano crystalline silicon to obtain a silicon-carbon composite material I; (S4) treating the silicon-carbon composite material I by using a carbon-containing sealing agent, and then activating to obtain a silicon-carbon composite material II; and (S5) carrying out vapor phase silicon deposition on the silicon-carbon composite material II to fill the amorphous silicon in the pores of the porous carbon, and then carrying out carbon coating to obtain the graded ordered silicon-carbon negative electrode material. The silicon-carbon negative electrode material prepared by the invention is of a composite structure in which crystalline silicon and amorphous silicon are spatially and orderly distributed, so that the structural stability and the uniform distribution of silicon are realized.

The invention provides a silicon-based composite material, a preparation method thereof and a negative plate. The silicon-based composite material comprises silicon-based composite material particles, the silicon-based composite material particles comprise a porous substrate and silicon particles loaded in pores of the porous substrate, the silicon particles comprise at least one silicon nanoparticle and an oxygen-enriched layer at least partially coating the silicon nanoparticle, the oxygen-enriched layer is made of SiOx, x is more than 0 and less than or equal to 2, and x is more than 0 and less than or equal to 2. And the oxygen content in the oxygen-rich layer is in gradient change along the direction from the center to the surface of the silicon nanoparticle. According to the silicon-based composite material provided by the invention, the plurality of silicon particles taking the silicon nanoparticles as the core and the oxygen-enriched layer as the shell are loaded on the porous substrate, and the oxygen content in the oxygen-enriched layer is in gradient change, so that the conductivity of the silicon-based composite material is improved; moreover, the volume expansion of silicon in the lithium intercalation process can be relieved by utilizing the oxygen-enriched layer with the gradient change of the oxygen content, the expansion rate of the electrode is reduced, and the cycle performance of the battery is further improved.

The invention provides an oxide-modified positive electrode material and a preparation method and application thereof. The preparation method comprises the following steps: 1) reacting metal salt with a precursor alcohol solvent for a certain time to form a solution A; 2) mixing the coated substrate material with an anti-solvent to form a solution B; (3) mixing the solution A obtained in the step (1) with the solution B obtained in the step (2), and forming a uniform and continuous coating layer with controllable thickness on the surface of the coating substrate material to obtain uniformly coated powder; and 4) calcining the uniformly coated powder obtained in the step 3) to form the oxide modified positive electrode material. The oxide-modified positive electrode material can be used for remarkably prolonging the cycle life and improving the rate capability of the positive electrode material of the lithium ion battery, and has very high practical value and application prospect.

The present application relates to the field of batteries and provides a silicon-carbon negative electrode material, a preparation method therefor, a negative electrode piece, an electrode, and an electric device. The silicon-carbon negative electrode material comprises porous carbon and silicon particles attached to the pore walls of the porous carbon, a crystal phase being present in the silicon particles, crystallinity being at least 90%, and the average crystal grain size of the silicon particles being less than 4 nm. The silicon-carbon negative electrode material can allow batteries to obtain better cycle stability and high initial Coulombic efficiency.

To provide a negative electrode active material which is capable of increasing the capacity while maintaining the battery characteristics.SOLUTION: There is provided a negative electrode active material including negative electrode active material particles. The negative electrode active material particles each include a porous carbon structure. Silicon and an oxide of silicon are dispersed inside the porous carbon structure. An amorphous low-valence nano silicon oxide is dispersed at least in a surface layer part inside the porous carbon structure. In the low-valence nano silicon oxide, SiOx: x<1.0 is satisfied. Nano silicon having a crystal structure is dispersed at least in a deeper layer portion than the low-valence nano silicon oxide inside the porous carbon structure.SELECTED DRAWING: Figure 1

The invention relates to a silicon-carbon negative electrode material and a preparation method and application thereof, in particular to a liquid-phase in-situ polymerization coating-based silicon-carbon negative electrode material and a preparation method and application thereof, and the preparation method comprises the following steps: mixing a silicon-carbon composite precursor and a solvent according to a certain mass ratio, and uniformly stirring to form a solvent system; adding an organic carbon source into the solvent system, and uniformly stirring to form an organic precursor solution; carrying out hydrothermal reaction on the organic precursor solution, so that an organic carbon source is subjected to in-situ polymerization reaction on the surface of the silicon-carbon composite precursor to form a compact coating layer, and obtaining an intermediate product; and carrying out heat treatment on the intermediate product, discharging, and sieving to obtain the silicon-carbon negative electrode material based on liquid-phase in-situ polymerization coating, when the silicon-carbon negative electrode material is used for preparing a negative electrode plate and assembling the negative electrode plate into a lithium ion battery, the first-cycle coulombic efficiency and the cycle performance of the lithium ion battery can be improved.

The invention discloses a polycrystalline silicon production industrial load participated power grid dispatching method and related products. According to the method, a target function is constructed according to the maximum adjustable capacity of a polycrystalline silicon factory within a preset time, and constraint conditions comprise a material balance constraint, an electric quantity balance constraint, a storage constraint, a yield constraint, a purification task starting constraint and a reduction task starting constraint. The constraint conditions consider the coupling relationship of each link in the polycrystalline silicon production process, so that the formed economic dispatching model can improve the dispatching capability of the polycrystalline silicon production industrial load to the power grid. Moreover, in the construction process of the economic dispatching model, materials and processes are abstracted into states and tasks respectively by utilizing a state task network method in the polycrystalline silicon production process, and a state task network block diagram is drawn to describe the coupling relationship among the processes, so that the accuracy of the model can be ensured.