378results about How to "Inhibit swelling" patented technology

The invention relates to a preparation method and application of an inner-rigid outer-soft core-shell structure silicon dioxide blocking agent for marine drilling fluid, and belongs to the field of deepwater oil and gas drilling. N-vinyl-2-pyrrolidone, dimethyl diallyl ammonium chloride, acrylamide and 2-acrylamide-2-methylpropanesulfonic acid are polymerized and grafted on the surface of nano silicon dioxide to form the silicon dioxide blocking agent with a core-shell structure and a rigid inside and a soft outside; by means of rigid plugging of a nano material and deformation filling flexible plugging of a high-molecular polymer, shale micro-nano pores are efficiently plugged with rigid inside and flexible outside, so that the stability of a well wall is maintained, meanwhile, secondary generation of hydrates is effectively inhibited, and the safety and efficiency of deepwater drilling are improved; the plugging agent provided by the invention reduces the demand on a large number of thermodynamic inhibitors, not only saves the cost, but also has the characteristic of environmental protection.

The invention relates to the technical field of battery negative electrode materials, in particular to a silicon-carbon negative electrode material and a preparation method of the silicon-carbon negative electrode material in a low-temperature silicon-carbon deposition mode. The method comprises the following steps: performing synchronous silicon-carbon deposition or step-by-step silicon-carbon deposition on carbon-based material particles in a fluidized bed at a relatively low temperature to form silicon-carbon intermediate phase particles, and further performing carbon coating to form the silicon-carbon negative electrode material. The low-temperature silicon-carbon deposition mode involved in the process can effectively control the stability of heat release of the chemical vapor deposition reaction in the aspect of operation and improve the uniformity of temperature field distribution in the reactor, so that the overall reaction rate is controllable, and parameters such as the particle size and the nano silicon content of the silicon-carbon negative electrode material are easy to regulate and control. When the preparation method provided by the scheme of the invention is adopted, on the basis of ensuring that the safety is effectively improved, the yield and the product quality of the silicon-carbon negative electrode material are obviously optimized, and the silicon-carbon negative electrode material shows excellent electrochemical performance.

The invention discloses high-temperature and high-pressure filtrate reducer sulfonated asphalt for drilling fluid and a preparation method of the high-temperature and high-pressure filtrate reducer sulfonated asphalt, and belongs to the technical field of filtrate reducers. A comb-shaped side chain is introduced into a benzene ring of SEBS, the benzene ring is endowed with a comb-shaped structure, the structure strongly interacts with sulfonated asphalt, asphalt dispersion is optimized, agglomeration is avoided, 5-(2-hydroxyethyl) uracil is introduced, the oleophylic and hydrophilic characteristics are balanced, the acting force between asphalt particles is reduced, the reaction efficiency and uniformity of asphalt and fuming sulfuric acid are improved, and the sulfonated asphalt is prepared. The dispersant promotes uniform dispersion of asphalt, accelerates sulfonation reaction and improves sulfonated asphalt quality. The surface activity of the modified SEBS and the sulfonated asphalt form a net structure, so that the water solubility of the asphalt is enhanced, the drilling fluid is convenient to blend, the liquid surface tension is reduced, and the bubble formation condition is destroyed. A quaternary ammonium salt group is introduced, a well wall is stabilized by utilizing an opposite attraction principle, clay hydrophobicity is promoted, hydration and expansion are inhibited, and collapse is prevented. The modified sulfonated asphalt is resistant to temperature and pressure, good in filtration resistance and stable in filtration control at high temperature and high pressure.

The invention discloses a lithium ion battery negative electrode with low expansion and low impedance. The lithium ion battery negative electrode comprises a composite current collector and a negative electrode active material coating coated on at least one surface of the composite current collector, the negative electrode active material coating comprises a negative electrode active material, graphene and lithium polyacrylate; the mass ratio of the negative electrode active material to the graphene to the lithium polyacrylate is (90-99): (0.5-5): (0.5-5), the negative electrode active material comprises a silicon carbon material and a coating material layer arranged on the outer surface of the silicon carbon material, and the coating material layer comprises a polypyrrole layer and single-walled carbon nanotubes uniformly distributed in the polypyrrole layer. Compared with the prior art, the lithium ion battery negative electrode provided by the invention has the advantages of low expansion and low impedance, and can effectively inhibit the expansion of silicon particles, reduce the internal resistance of the battery and maintain the structural stability of the electrode.

The invention provides a polyurethane waterproof coating, a preparation method and a waterproof product. The polyurethane waterproof coating comprises the following raw materials in parts by weight: 206 parts of a polyurethane prepolymer; the polyurethane prepolymer is formed by reaction of hydroxyl-terminated polybutadiene acrylonitrile, organic silicon dihydric alcohol, polyether polyol and polyisocyanate; and 3 to 7 parts of oxazolidine end-capped modified resin based on 206 parts of the polyurethane prepolymer; 6-12 parts of a latent curing agent; 40 to 85 parts of an epoxy plasticizer; and 130 to 300 parts of an additive. According to the polyurethane waterproof coating, organic silicon dihydric alcohol, hydroxyl-terminated polybutadiene acrylonitrile and polyisocyanate react to form an NCO-terminated prepolymer, oxazolidine-terminated modified resin contains terminal group oxazolidine, and the terminal group oxazolidine is hydrolyzed to release secondary hydroxyl and amino to participate in the reaction; the peeling strength of the waterproof material formed by compounding the polyurethane coating and the coiled material is improved.

The invention provides a myriameter deep oil-gas wall-fixing type water-based drilling fluid as well as a preparation method and application thereof, and belongs to the technical field of drilling fluids. The myriameter deep oil gas wall-fixing type water-based drilling fluid is prepared from the following raw materials in parts by weight: 100 parts of water, 1-5 parts of a modified clay shear strength improving agent, 2-4 parts of a hydrophobic association polymer flow pattern regulator, 3-8 parts of a blocking agent, 2-5 parts of a hyperbranched polymer filtrate reducer and 1-3 parts of a cementation blocking type wall-fixing agent. The invention also provides a preparation method of the drilling fluid. The components such as the flow pattern regulator, the plugging agent, the filtrate reducer and the wall-fixing agent are mutually matched and synergistic, so that the drilling fluid can keep good rheological, filtration, plugging and inhibition performances for a long time under the conditions of 240 DEG C and saturated salt, has a strong wall-fixing effect, can effectively maintain the stability of the well wall of an oil-gas well in the depth of 10,000 meters, and has a wide application prospect. And well collapse, well leakage, blowout and other complex well drilling are prevented, and the drilling tool can be used for drilling oil and gas wells with the depth of ten thousand meters.

The invention provides an anti-expansion new energy battery which comprises a battery box, air draft assemblies, a liquid cooling assembly, an air supply assembly, air cooling assemblies and a battery cell, the two air draft assemblies are installed on the left surface of the battery box, the air cooling assemblies are installed at the bottom and the upper portion of the battery box, and the battery cell is installed in the battery box. Compared with the prior art, the invention has the following beneficial effects: the air cooling assembly is matched with the liquid cooling assembly, two sets of cooling structures with different cooling modes are provided, and the battery core can be rapidly cooled, so that the battery core can work in a reasonable temperature range during charging and discharging, the battery core is prevented from expanding due to high temperature, the service life of the battery core is greatly prolonged, and the service life of the battery core is prolonged. The air draft assembly can suck away heat generated by the battery cells in the battery box through the air cooling assembly in a manner of accelerating air flow, so that not only can the air flow speed in the battery box be accelerated, but also hot air in the battery box can be rapidly guided away, and the purpose of rapid cooling is achieved.

The invention provides a low-carbon ultra-deep denitrification method and device for town sewage, belongs to the field of sewage treatment, and is used for town sewage treatment. In a continuous flow anaerobic-aerobic anoxic alternating-post anoxic process, town sewage and refluxed heavy sludge enter an anaerobic zone of a biochemical pool, refluxed light sludge and added hydroxylamine enter an aerobic anoxic alternating zone of the biochemical pool, and a sludge-water mixed solution flowing out of a post anoxic zone of the biochemical pool enters a secondary sedimentation tank for sludge-water separation; and discharging the supernatant as effluent, separating the precipitated sludge into heavy sludge and light sludge in a cyclone separator, refluxing the heavy sludge and part of the light sludge into the process according to the mode, and discharging part of the light sludge as residual sludge. Microorganisms in the sludge store an internal carbon source in an anaerobic zone of the biochemical pool, short-cut nitrification-endogenous denitrification is realized in an aerobic-anoxic alternating zone of the biochemical pool, and ultra-deep endogenous denitrification nitrogen removal is realized in a rear anoxic zone of the biochemical pool. According to the invention, low-carbon ultra-deep nitrogen removal of town sewage can be realized.

The invention discloses a method for controlling sludge bulking and realizing sludge granulation by using iron-carbon micro powder. The method comprises the following steps: crushing and grinding iron-carbon particles, and screening to obtain iron-carbon micro powder with the particle size of 50-200 microns; adding the iron-carbon micro powder into the expanded activated sludge system according to the adding amount of 0.5-5.0 kg / m < 3 >; and after addition, the sludge bulking phenomenon is rapidly controlled, and the sludge settling performance is obviously improved. Besides, the iron-carbon micro powder is used as a crystal nucleus, and the iron-carbon powder plays a micro-electrolysis role, so that the formation of the aerobic granular sludge is promoted, and meanwhile, the pollutant removal performance of the system is improved. The problem of sludge bulking in wastewater can be effectively solved, and the aerobic granular sludge with efficient treatment performance can be cultured.

The invention relates to the field of oil field treatment agents, in particular to a petroleum antibacterial clay stabilizer and a preparation method thereof, and solves the problems that in the prior art, a clay stabilizer is easy to separate from intermolecular layers of clay, a micromolecular clay stabilizer is poor in adhesion, and a macromolecular stabilizer is difficult to act on the intermolecular layers of the clay. The antibacterial clay stabilizer is obtained by mixing a slow-release neutralization solution and a stable factor solution, wherein the slow-release neutralization solution comprises polyvinylpyrrolidone, cationic metal release particles and a reducing agent; the stable factor liquid comprises stable factors, deionized water, glacial acetic acid, polyether polyol and a potassium hydroxide solution; the clay stabilizer disclosed by the invention not only can be conveniently inserted into clay layers with relatively small molecular weight, but also can effectively and stably retain colloidal molecules due to strong hydrophobicity of an external long chain, so that metal cations are stably and slowly released, and the anti-swelling effect of clay is enhanced.

The invention belongs to the technical field of battery preparation, and particularly relates to a lithium ion battery. The lithium ion battery comprises a positive pole piece, a negative pole piece and a diaphragm arranged between the positive pole piece and the negative pole piece, the positive pole piece at least comprises a positive current collector; the tensile strength A1 of the negative current collector, the elongation B1 of the negative current collector, the tensile strength A2 of the positive current collector and the elongation B2 of the positive current collector meet the relational expression 1, so that the negative pole piece can resist deformation caused by lithium removal and lithium intercalation, the deformation quantity of the negative pole piece is reduced, the pole piece is prevented from expanding, and the service life of the negative pole piece is prolonged. The separation of the negative pole piece and the diaphragm is reduced, the short circuit of the battery is prevented, and the safety performance of the battery is improved.

The invention provides a negative plate and a battery, the negative plate comprises a current collector and an active material layer located on at least one side surface of the current collector, and the active material layer comprises a first coating close to the surface of the current collector and a second coating far away from the surface of the current collector; the first coating comprises first graphite particles and second graphite particles; the second coating comprises third graphite particles and silicon carbon particles; and a plurality of concave parts are arranged on the surface of the active material layer. According to the negative electrode plate, the expansion problem and the lithium separation problem of the silicon-based material doped graphite negative electrode can be inhibited, so that the cycle performance and the rate capability of the lithium ion battery are remarkably improved.

The invention belongs to the field of high-performance anion exchange membranes for hydrogen production by electrolysis of water and preparation of the high-performance anion exchange membranes, and particularly discloses a branched poly (aryl piperidine)-based anion exchange membrane material with a high free volume as well as a preparation method and application of the branched poly (aryl piperidine)-based anion exchange membrane material. A branching agent 9, 9-diphenylfluorene is introduced into a polymer structural unit, so that the free volume in the membrane material is increased, meanwhile, the movement capacity of part of chain segments is limited, swelling of the membrane material due to water absorption is inhibited, the ionic conductivity and the dimensional stability of the membrane material are effectively improved, and the prepared anion exchange membrane can be applied to hydrogen production through water electrolysis.

The invention discloses a preparation method of a phosphorus-doped hard carbon composite material for a sodium battery. The preparation method comprises the following steps: preparing a hard carbon precursor, preparing a phosphorus-doped precursor, preparing a catalyst precursor, preparing a hard carbon composite material, and carrying out pickling purification. Through pre-oxidation treatment on the biomass raw material, oxygen-containing free radicals can be introduced, the structural disorder can be improved, the sodium storage space and the capacity can be improved, phosphorus elements are uniformly distributed into the hard carbon material through a vapor deposition method, meanwhile, graphene and carbon nanotubes are formed in the material, closed pores are increased, the sodium storage space is improved, and the performance of the hard carbon material is improved. According to the present invention, the ion transmission path is shortened, the sodium ion transmission is accelerated, the capacity and the conductivity of the material are enhanced, the material is coated with the amorphous carbon formed by the asphalt, such that the phosphorus expansion can be inhibited, the contact with the electrolyte can be avoided, the capacity and the first effect can be improved, and the phosphorus and the coating layer can be re-distributed while the asphalt coating is performed so as to form the small amount of the phosphorus fiber crystal; and the conductivity and the capacity are improved.

The utility model belongs to the technical field of battery production and manufacturing, and particularly relates to a battery cell which comprises a first pole piece, a diaphragm and a second pole piece which are sequentially wound, and the diaphragm is arranged between the first pole piece and the second pole piece; the areas of the second bending positions of the first pole piece and the second pole piece are of a single-face coating structure, and insulating gummed paper is adhered to the second bending positions, corresponding to the diaphragm, of the first pole piece and the second pole piece. According to the utility model, the insulating gummed paper is adhered to the second bending part of the first pole piece and the second pole piece corresponding to the diaphragm, so that the positive electrode and the negative electrode in the area are in a separated state and cannot react, the active material layer cannot expand to reduce the stress on the position, the risk of breakage of the pole pieces is reduced, and the safety performance of the battery cell is improved. In addition, the utility model also discloses a battery comprising the battery cell and an electric device.

The invention discloses a charging control method of a two-wheeled vehicle shared charging pile and a charging pile, and relates to the technical field of shared charging piles, and the method comprises the following steps: obtaining various parameter information generated by the two-wheeled vehicle shared charging pile in the process of charging a two-wheeled vehicle, the parameter information including energy management information and system compatibility information; the charging process of the two-wheeled vehicle shared charging pile is intelligently monitored, the charging hidden danger index is generated in time, the high-risk state is effectively recognized, especially, early warning is rapidly given out under the non-accidental condition, workers are reminded of inspection, battery overheating, expansion or explosion is prevented, and the safety of users and the environment is guaranteed. In addition, by analyzing energy management and system compatibility information, an energy conversion efficiency index and a charging adaptability index are generated, and it is ensured that the charging pile intelligently matches different electric vehicle requirements. Through the optimization, the utilization rate of electric energy is improved, the charging cost is reduced, data support is provided for subsequent maintenance, and the management efficiency and the service reliability are enhanced.

The lithium ion secondary battery comprises a positive plate, a negative plate, electrolyte and a diaphragm, the negative plate comprises a negative current collector and a negative active layer arranged on the negative current collector, the negative active layer comprises a first active layer and a second active layer which are arranged on the surface of the negative current collector, and the second active layer is arranged on the surface, far away from the negative current collector, of the first active layer; the first active layer comprises a first negative electrode active material, and the first negative electrode active material comprises first graphite; the second active layer comprises a second negative electrode active material, and the second negative electrode active material comprises silicon carbon; the electrolyte comprises 1, 3, 6-hexane trinitrile, the mass content of the 1, 3, 6-hexane trinitrile in the electrolyte is 0.5 wt%-10wt%, and the battery provided by the invention has a relatively high cycle capacity retention ratio.

The invention relates to an integrated negative electrode binder for a silicon-based negative electrode, a negative electrode plate and a lithium battery. Wherein the integrated negative electrode binder for the silicon-based negative electrode comprises a polymer and a conductive material; the polymer comprises a polyacrylic acid copolymer modified by a hydrophilic block and a hydrophobic block, the weight-average molecular weight of the polymer is 600,000-800,000, the number-average molecular weight of the polymer is 300,000-500,000, and the polydispersity of the polymer is 1.2-2.5. The silicon negative electrode has the advantages that the mechanical performance of the silicon negative electrode can be improved, the stress generated in the volume expansion of the silicon particles is dissipated, so that the silicon particles are prevented from being broken, and the adhesion to the conductive carbon material is good.

The invention provides a child arterial paracentesis nursing device, and belongs to the technical field of medical instruments. In order to solve the problems that an existing nursing device cannot control the compression strength of a puncture point and is single in function, a hemostasis pressing device is additionally arranged on a fixing plate, and the hemostasis pressing device comprises a hemostasis pressing mechanism and a massage mechanism; the hemostasis pressing mechanism comprises a positioning assembly and a hemostasis pressing block; the massage mechanism comprises a rotating assembly and a massage head, and the massage head is arranged on the hemostasis compression block in a sleeving mode, so that under the condition that hemostasis compression needs to be conducted on puncture points of patients such as children, the hemostasis compression block can extend outwards to the outer side of the massage head through the positioning assembly, and hemostasis compression of the puncture points is achieved; if the puncture point is pressed for hemostasis, the skin of the puncture point of the patient is bruised or painful, and the like, the massage head can be controlled to rotate through the rotating assembly to massage the skin around the puncture point, bruise elimination is promoted, and discomfort of the patient is relieved.

The invention discloses a high-load electrode material and a preparation method thereof, and the high-load electrode material is prepared by the following steps: reacting a modified monomer, 4, 4 ', 4'-triaminotriphenylamine and 3, 3 ', 4, 4'-biphenyl tetracarboxylic dianhydride to form polyamic acid, adding a modified filler, reacting amino on the modified filler with part of carboxyl on the polyamic acid, and carrying out high-temperature imidization treatment. The surface of the modified filler contains amino groups which can react with a polyamide acid molecular chain, the molecular chain is of a hyperbranched structure, so that the electrolytic material is an interlaced porous grid, the specific surface of the electrolytic material is increased, the modified filler internally contains a structure in which silicon and carbon support each other, and the surface of the modified filler is coated with organic polymers, so that collapse and expansion of the electrode material are prevented, and the service life of the electrode material is prolonged. The electrode material has the advantages that the electrode material contains metal oxide inside to form pseudocapacitance to increase the electricity storage capacity, the organic matter on the surface contains N = N bonds and S-S bonds to improve the lithium storage performance, and the capacity of the electrode material is further increased due to the addition of 4, 4 '4' '-triaminotriphenylamine and a large number of benzene ring structures.

A stepped sliding block guide demolding mechanism of an injection mold comprises a cavity frame and a core frame, a cavity insert is arranged in the cavity frame, a core insert is arranged in the core frame, the core insert and the cavity insert are matched to form a mold cavity, a product subjected to injection molding is arranged in the mold cavity, an inverted buckle is manufactured on the product, a sliding block is arranged on the core frame, the front end of the sliding block is matched with the inverted buckle, and the rear end of the sliding block is matched with the inverted buckle. The sliding block is driven by a stepped guide structure to be separated from the inverted buckle, the stepped guide structure comprises first stepped guide rails arranged on the two side walls of the sliding block and corresponding second stepped guide rails arranged below the cavity frame, and the first stepped guide rails and the second stepped guide rails are matched in a crossed mode. According to the scheme, longitudinal action is converted into transverse action through step matching, the transverse demolding stroke is shortened, the effect of sliding block retreating (outward sliding) is achieved, step type guide rail matching is achieved, the action is fast, the production period is effectively shortened, and the production efficiency is improved.

The invention provides a diamond and negative expansion particle reinforced aluminum matrix composite and a preparation method, and belongs to the technical field of composites. The aluminum-based composite material is composed of a diamond phase and a negative thermal expansion phase which are dispersed in an aluminum matrix. The average particle size of the diamond phase is 10-1000 [mu] m, and the ratio of the average particle size of the diamond phase to the average particle size of the negative thermal expansion particles is 10-20; the particle size of the negative thermal expansion particles adjacent to the diamond phase is smaller than that of the negative thermal expansion particles away from the diamond phase. The diamond and negative expansion particle reinforced aluminum-based composite material with excellent thermophysical performance is obtained by regulating and controlling the volume fraction of the diamond and the negative expansion particles, the thermal expansion coefficient matched with a semiconductor material is prepared through a collaborative optimization strategy, and the diamond and negative expansion particle reinforced aluminum-based composite material is applied to the field of electronic packaging heat dissipation materials.

The invention discloses an axial flow casing coating hole and runner machining device and method, and belongs to the technical field of aero-engine manufacturing, the axial flow casing coating hole and runner machining device comprises a small drill bit, a large drill bit and a first supporting piece, a middle through hole is formed in the first supporting piece, and the middle through hole is located above a piston piece and is an oil storage cavity; the limiting piece is used for abutting against and pressing an inner hole of the axial flow casing so as to support the axial flow casing, and a pressure adjusting cavity is formed in the limiting piece; the pushing assembly is used for pushing the piston piece to ascend and descend and pushing hydraulic oil in the oil storage cavity into the pressure adjusting cavity when the piston piece ascends, and then the pressure of the pressure adjusting cavity is increased to push the limiting piece to expand and press an inner hole of the axial flow case. On the contrary, when the piston piece descends, pressing and supporting of the limiting piece on the inner hole of the axial flow casing are released. In addition, the coating holes machined through the optimized machining method are good in smoothness, the coating is free of cracking and upheaval phenomena, meanwhile, the machined runner is small in deformation, and the process stability is greatly improved.

The invention belongs to the technical field of alkaline anion exchange membranes, and discloses an anion exchange membrane of an aryl piperidine tetra-monomer copolymer with a branched structure, and a preparation method and application thereof. The main chain configuration of the polymer is regulated and controlled by changing the monomer structure in the main chain and the feed ratio, then the polymer and iodomethane are subjected to quaternization reaction to obtain the functionalized four-monomer polymer, and finally the membrane is cast. According to the method for preparing the anion exchange membrane from the aryl piperidine tetra-monomer copolymer with the branched structure, swelling of the membrane can be well inhibited, multi-site distribution of ionic groups is achieved while the density of the ionic groups is improved, and formation of microscopic phase separation in the membrane is promoted, so that conduction of hydroxyl ions is enhanced. The anion exchange membrane prepared by the method has the characteristics of high conductivity and low swelling, so that the anion exchange membrane can be stably and efficiently applied to the field of fuel cells.

The invention belongs to the technical field of polymer composite materials, and particularly relates to a preparation method of a super-smooth surface based on modified composite particles, which comprises the following steps: spraying an organic-inorganic hybrid adhesive on the surface of a substrate for curing, and then spraying a modified composite particle dispersion liquid on the surface of the organic-inorganic hybrid adhesive for curing, thereby obtaining the super-smooth surface based on the modified composite particles. And finally, soaking the substrate loaded with the modified composite particles in lubricating oil added with a photoinitiator, and irradiating under ultraviolet light to obtain the super-smooth surface based on the modified composite particles. The prepared super-smooth surface based on the modified composite particles is excellent in performance, and the wear resistance, the mechanical strength and the like of the super-smooth surface can be enhanced.

The invention relates to the technical field of fracturing fluids, and discloses a fracturing fluid and a preparation method thereof.The preparation method comprises the steps that cardanol modified polyurethane, modified silicone rubber, hexadecyl trimethyl ammonium chloride, sodium salicylate and water are added into a reactor and stirred, and the fracturing fluid is obtained after stirring is finished. Wherein the quaternary ammonium salt group can reduce the reservoir damage by reducing the hydration of clay on the surface of shale and inhibiting the expansion and migration of the clay, can still keep stable performance at high temperature, and is beneficial to improving the temperature resistance of the fracturing fluid; wherein polyurethane has good temperature resistance, hydrogel is formed through crosslinking, and the hydrogel can still keep stable at high temperature, so that the temperature resistance of the fracturing fluid can be improved; cardanol in the fracturing fluid has good high temperature resistance, and can maintain the stability and effectiveness of the fracturing fluid under a high temperature condition; the silicon rubber structure contains silicon-oxygen bonds, so that the viscosity of the fracturing fluid can be improved, and meanwhile, the fracturing fluid has good anti-shearing capability in a high-temperature environment.

The invention provides a binder, a positive pole piece and a secondary battery. The adhesive comprises a first polymer as shown in a formula I, R1 is C5-C12 alkyl, and R2 is any one of C1-C3 alkyl, a hydrogen atom or aryl; the number average molecular weight of the first polymer is 6 * 10 < 4 >-2 * 10 < 6 >. The binder disclosed by the invention basically does not contain a fluorine element, is low in swelling rate and high in binding power, and can inhibit the expansion of the positive pole piece and improve the energy density of the secondary battery when being used in the positive pole piece and the secondary battery.

The composite lithium-supplementing negative electrode material comprises silicon negative electrode particles and a coating layer arranged on the surfaces of the silicon negative electrode particles, and the coating layer comprises a functional material; the functional material is of a core-shell structure, an inner core comprises a lithium supplement agent, and a shell comprises a polyurethane material. By adopting the functional material with the core-shell structure to coat the silicon negative electrode particles, the expansion of the silicon negative electrode particles can be inhibited, and the cycle performance of the battery is improved to a certain extent. In addition, the functional material comprises a lithium supplement agent core and a polyurethane material coating layer, so that the lithium supplement effect can be achieved; meanwhile, in the charging process of the battery, lithium ions are separated from the positive electrode and embedded into the negative electrode, the negative electrode material is expanded, particles are expanded and extruded, so that the polyurethane material in the functional material coating layer is broken, part of the lithium supplementing agent is released, rapid lithium supplementing is achieved, in the discharging process of the battery, the negative electrode material retracts, the lithium supplementing agent can be blocked by utilizing the repairing function of polyurethane, and the lithium supplementing agent is prevented from being damaged. Therefore, the cycle performance and the safety performance of the battery are synchronously improved.

The present invention provides a cation exchange membrane, which uses a polyolefin substrate, can suppress the swelling of an ion exchange resin, and has low resistance. The cation exchange membrane of the present invention is a cation exchange membrane comprising a substrate composed of a polyolefin woven fabric and a cation exchange resin having a sulfonic acid group, and contains 23% to 35% by mass of polyvinyl chloride in a portion other than the substrate.

The invention belongs to the technical field of lithium ion battery negative electrode materials, and particularly relates to a high-temperature self-healing composite silicon carbon electrode and a preparation method thereof.The high-temperature self-healing composite silicon carbon electrode comprises a copper foil, the two faces of the copper foil are coated with negative electrode active layers, and liquid metal layers are applied to the negative electrode active layers through supersonic spraying; the liquid metal is condensed and rolled in a gap of the negative electrode active layer; the negative electrode active layer is prepared by coating negative electrode slurry, the negative electrode slurry is prepared by mixing small-particle-size graphite, graphite, a silicon material, a binder and deionized water, the mass ratio of the small-particle-size graphite to the graphite to the silicon material is (0.5-1): (1.5-3): (6-8), and the viscosity of the negative electrode slurry is 3000-6000 mPa.s. Graphite with different particle sizes and a silicon material are used as negative electrode active substances for mixing, so that the compaction of an electrode material is effectively improved, the specific surface area of an electrode is reduced, and the first coulombic efficiency of a negative plate is facilitated.