200results about How to "Reduce bloat" patented technology

The invention provides a lithium-supplementing composite additive, a lithium-supplementing positive pole piece for inhibiting flatulence and application, and belongs to the field of lithium ion batteries. The lithium supplementing composite additive is a mixture of a lithium supplementing agent and aminated aluminum oxide, the mass ratio of the lithium supplement agent to the aminated aluminum oxide is (6-10): (3-5); the aminated aluminum oxide is activated aluminum oxide modified by an amino organic matter; the mass ratio of the amino organic matter to the activated aluminum oxide is 3: (7-12); the lithium supplement agent is hydroxyl cycloenone dilithium salt or lithium carboxylate. The lithium-supplementing positive pole piece capable of inhibiting flatulence comprises a current collector, an active coating and a functional coating located on the surface of the active coating, and the functional coating contains a lithium-supplementing composite additive and has the functions of supplementing lithium, absorbing acid and inhibiting flatulence. The method is characterized in that the aminated alumina matrix can absorb hydrofluoric acid in an electrolyte, and the aminated group can absorb carbon dioxide generated by decomposition of a lithium supplement agent. The method can reduce the problem of battery cycle gas expansion in the use process of the lithium supplement agent, and improves the battery cycle and safety performance.

The invention discloses a method for improving the fast charging performance of a silicon-carbon composite material, and the method comprises the following steps: firstly preparing a heteroatom-doped MOF material, then precipitating by a silane cracking method, introducing silane gas and heteroatom gas, and carrying out low-temperature passivation to obtain a silicon-carbon precursor material; the preparation method comprises the following steps: preparing an organic solvent of resin, adding a graphene oxide solution, uniformly dispersing, adding a silicon-carbon precursor, performing spray drying, and introducing hydrogen at 700-1000 DEG C to reduce the obtained material. The obtained material can improve the rate capability and the cycle performance.

The invention provides a silicon-based negative pole piece and a lithium ion battery comprising the same, and relates to the technical field of lithium ion batteries. Comprising a negative electrode current collector, a second active material layer arranged on at least one surface of the negative electrode current collector, and a first active material layer arranged on the surface of the second active material layer. The design of the two active material layers ensures high energy density, and meanwhile, the formula design is optimized by combining the bonding characteristic of the interface layer, so that large internal stress is prevented from being generated in the charging and discharging process; the organic porous cross-linked polymer is applied to the negative pole piece, and the polymer is loose and porous and can be subjected to cross-linked polymerization in a high-temperature process, so that negative pole particles are tighter, expansion of a silicon negative pole in a charging and discharging process can be buffered, and stripping and cracking of the pole piece are prevented.

The invention discloses a cooling forming device for power cable production, and relates to the field of cable manufacturing, the cooling forming device comprises a water tank base, a water pump mounting seat, a circulating water pump, a cooling tank and a cooling tank, the water pump mounting seat and the cooling tank are fixedly mounted at the upper end of the water tank base, and the water pump mounting seat is located on one side of the cooling tank. According to the cooling forming device for power cable production, the device size is smaller, the single-motor driving structure is simple, meanwhile, the cable and water cooling forming time is guaranteed, pressure is applied to a cable through water pressure, the shell shrinkage effect of the cable is improved, expansion generated by thermal forming machining of the cable is reduced, and the service life of the cable is prolonged. The cooling efficiency of contact between water and the cable is improved, meanwhile, water can enter the water tank base more quickly to circulate, cable cooling is prevented from being affected by accumulated heat generated by insufficient water cooling, the annularly-arranged air injection holes can comprehensively inject air to remove water from the cable, and the problem that water spots are left after the cable is cooled is solved.

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 discloses a solid electrolyte coated porous microcrystalline graphite composite material, a composite negative electrode and a preparation method and application of the composite negative electrode. The solid electrolyte coated porous microcrystalline graphite composite material comprises porous microcrystalline graphite with a porous structure; the particle size compounded inorganic solid electrolyte comprises a gathering part filled in a porous structure, and coating parts distributed among particles of porous microcrystalline graphite and on the surface of the porous microcrystalline graphite. The composite negative electrode comprises a current collector, a solid electrolyte coated porous microcrystalline graphite composite material arranged on the surface of the current collector and metal compounded on the surface of the composite material. The surface of the porous microcrystalline graphite is coated with the compounded solid electrolyte with different particle sizes, so that the ionic conductivity of the material can be greatly improved, and uniform deposition and dissolution of metal are facilitated; and the prepared composite negative electrode has lower expansion, the porous microcrystalline graphite can contribute higher reversible capacity, and the composite negative electrode has the advantages of high capacity and high compaction.

The invention discloses a fast-charging low-temperature graphite composite material, a preparation method and application thereof, the composite material is of a core-shell structure, the core is porous graphite and a carbon nanotube doped with the porous graphite, and the shell is composed of a lithium supplement agent and a lithium sulfonate complex of the lithium supplement agent. The preparation method comprises the following steps: soaking porous graphite in a conductive polymer solution, adding a catalyst, a cross-linking agent and an oxidizing agent, carrying out oxidative polymerization and carbonization to obtain catalyst-doped porous graphite, and introducing carbon source gas through a vapor deposition method to obtain carbon nanotube-doped porous graphite; and adding the obtained material into a lithium sulfonate solution, adding a lithium supplement agent, uniformly mixing, and carrying out spray drying to obtain the graphite composite material. According to the obtained material, the electronic conductivity of the material is improved by using the carbon nanotubes grown on the inner core, and the lithium sulfonate coated on the outer shell has relatively strong solvation capability, so that the transmission rate of lithium ions is improved, and the rate capability is improved; meanwhile, the lithium supplement agent releases lithium ions in the charging and discharging process, the first efficiency is improved, and the low-temperature and fast-charging performance is improved.

The invention discloses a preparation method of a wide-temperature-range multistage phase-change temperature-adjusting asphalt mixture. The preparation method comprises the following steps: respectively preparing a plurality of different composite organic eutectic phase-change materials; a plurality of different composite organic eutectic phase-change materials are compounded according to different proportions to obtain the wide-temperature-range multistage phase-change material. The wide-temperature-range multi-stage phase-change material is doped into an asphalt mixture according to the mass ratio of 3%-5%, and the wide-temperature-range multi-stage phase-change temperature-adjusting asphalt mixture is formed. The wide-temperature-range multi-stage phase-change temperature-adjusting asphalt mixture disclosed by the invention can continuously play a phase-change heat storage function in a high-temperature environment in summer, and achieves the effects of delaying the pavement temperature change rate, reducing the pavement maximum temperature, delaying the daily maximum appearance time, reducing the pavement surface temperature and improving the pavement temperature. Therefore, the urban heat island effect can be relieved, and the pavement durability is prolonged.

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 discloses a double-lithium compound coated silicon-carbon composite material and a preparation method thereof, the composite material has a core-shell structure, the core is passivated silicon carbon, the shell is composed of a first shell layer and a second shell layer, the first shell layer is an inorganic lithium compound, and the second shell layer is an organic lithium coating layer. The preparation method comprises the following steps: adding liquid silane and porous carbon into an organic solvent, and gasifying and decomposing under negative pressure to obtain a silicon-carbon precursor material; and then coating an inorganic lithium compound on the surface through a liquid phase method, drying, adding the obtained material, uniformly mixing with an organic lithium compound, and carrying out spray drying to obtain the lithium ion battery positive electrode material. The obtained material is applied to a lithium ion battery, can improve the cycle performance, and is high in safety and low in cost.

The invention provides a pole piece, a roll core and a battery, relates to the technical field of batteries, and is used for solving the technical problem that an active material layer at a knurling bulge is separated from a current collector due to the fact that the knurling bulge is arranged on the pole piece in the prior art. The pole piece comprises the current collector, a first active material layer and a second active material layer; the current collector has a first surface and a second surface opposite to each other, the first active material layer is arranged on the first surface, and the second active material layer is arranged on the second surface; a plurality of first convex parts are arranged on the first active material layer, and a plurality of concave parts corresponding to the first convex parts are arranged on the second active material layer; the current collector is provided with a bent part and a flat part, the bent part is located between the first protruding part and the concave part, the bent part is provided with a plurality of second protruding parts, and the second protruding parts are arranged on the first surface or the second surface in a protruding mode. The second protruding parts can increase the contact area between the active material layer and the current collector, improve the bonding strength between the active material layer and the current collector, and prevent the active material layer from falling off.

The invention provides a thick photoresist photoetching method for smooth forming of a side wall of a deep mesa structure. The thick photoresist photoetching method comprises the following steps: coating a layer of uniform and compact positive photoresist on the surface of a chip by using spin coating equipment; pre-baking: placing the chip coated with the photoresist in a first temperature environment for baking; placing the pre-baked chip on a sample table of a contact type photoetching machine, placing a mask plate, adjusting WEC to a proper position, and then performing exposure; post-baking: placing the exposed chip in a first temperature environment for baking; developing: preparing a proper developing solution, and placing the post-baked chip in the developing solution to remove the photosensitive part so as to complete the forming of the mesa mask; and carrying out hardening process treatment on the developed chip by adopting a gradient heating mode. According to the invention, the quality of the side wall can be improved, the roughness of the side wall can be reduced, the adhesion quality of the passivation layer can be improved, and the performance of the infrared detector can be improved.

The utility model discloses a battery device and energy storage equipment with the same, and the battery device comprises a box body and at least one battery assembly. The box body is provided with a containing cavity and has a first direction. The battery assembly is arranged in the containing cavity and comprises a plurality of battery cells and at least one first restraining part, the battery cells are arranged in the first direction, the first restraining part provides restraining force in multiple directions for the battery cells, and the direction of at least one restraining force in the restraining force in the multiple directions is parallel to the first direction. When the battery cell expands, the first restraining piece can disperse the outward pressure of the battery cell, so that the restraining effect on the battery device is enhanced, the expansion of the battery cell is reduced, further the expansion of the battery device can be reduced, the use safety of the battery device is ensured, and the service life of the battery device is prolonged.

The utility model discloses an aerogel fire prevention and heat preservation integrated board, and belongs to the technical field of fire prevention and heat preservation integrated boards. An aerogel fireproof and heat-preservation integrated plate comprises a fireproof plate body, a decorative layer, a first aerogel layer, a first waterproof layer, a ventilation layer, a second waterproof layer, a second aerogel layer and a back plate layer are sequentially arranged in the fireproof plate body, aerogel columns are arranged in notches, aerogel films are arranged in the aerogel columns, and the aerogel films are arranged in the notches. The aerogel column is formed by rolling an aerogel film in a staggered manner. According to the aerogel fireproof thermal insulation integrated board, through staggered rolling of the aerogel film, the aerogel columns can effectively block heat, so that a wall is protected from being damaged, cold air can be blocked, thermal insulation of the wall is achieved, the effect of blocking the heat and the cold air can be achieved without too thick first aerogel layers and second aerogel layers, use of aerogel materials is reduced, and the cost is reduced. And the volume of the integrated plate is reduced, so that the installation is convenient.

The invention provides a high-voltage-resistant lithium ion negative electrode plate and a lithium ion battery, and the negative electrode plate adopts the particle size grading of graphite with a specific particle size and a silicon material with a specific particle size, and optimizes a low-expansion and high-compaction negative electrode material and a formula. Graphite with a specific particle size and a spheroidal (spherical) silicon negative electrode coated with a conductive agent are subjected to particle size grading, so that the dispersion uniformity can be improved, the compaction density of a pole piece is improved, the pressure resistance of the pole piece is improved, and meanwhile, the expansion of the silicon negative electrode is reduced; the overall dynamic performance and stability of the lithium ion battery prepared by using the negative pole piece can be greatly improved.

The invention relates to the technical field of electrode materials, in particular to a composite silicon negative electrode material suitable for a sulfide-based all-solid-state battery and a preparation method and application thereof, and the preparation method comprises the following steps: (1) generating a metal organic framework material on the surface of a nano silicon material through an in-situ growth method; (2) carbonizing the metal organic framework material on the surface of the nano silicon material through calcination treatment to form a nitrogen-doped porous carbon material, so as to obtain a Si-NC material; and (3) generating a sulfide solid electrolyte on the surface of the Si-NC material through an in-situ growth method to obtain the Si-NC-SE composite silicon negative electrode material. According to the invention, the surface of the Si material is coated with the nitrogen-doped porous carbon material (NC) through an in-situ generation technology, and the sulfide solid electrolyte is generated in situ, so that the conductivity of the composite silicon negative electrode material and the cycling stability of the sulfide-based all-solid-state battery adopting the composite silicon negative electrode material are improved.

The invention provides a negative electrode material and a battery, the negative electrode material comprises secondary particles, the secondary particles comprise primary particles and amorphous carbon connected with the primary particles, and the primary particles comprise graphite; the negative electrode material comprises at least one of an N element and a P element; in the negative electrode material, the corresponding particle sphericity degree is S10 when the cumulative volume distribution percentage reaches 10%, the corresponding particle sphericity degree is S50 when the cumulative volume distribution percentage reaches 50%, the corresponding particle sphericity degree is S90 when the cumulative volume distribution percentage reaches 90%, S10 is larger than or equal to 0.75 and smaller than or equal to 0.85, S50 is larger than or equal to 0.85 and smaller than or equal to 0.9, and S90 is larger than or equal to 0.9 and smaller than or equal to 1.0. The negative electrode material provided by the invention is relatively good in particle sphericity degree, the isotropy of the negative electrode material can be improved, and the specific capacity and the fast charge rate performance of the negative electrode material can be improved.

The invention belongs to the technical field of biological gel films, and particularly relates to a preparation method and application of an antibacterial gel film based on fish scale gelatin compounded with probiotics. The fish scale gelatin and the probiotics are creatively compounded, and the prepared gel film has good performance; meanwhile, the alcohol-soluble protein, the trehalose and the amino acid are added, so that the fish scale gelatin can form a special space structure, pores are uniform, the structure is compact, and the physicochemical properties of the fish scale gelatin are further improved; the prepared gel film also has a good bacteriostatic effect, and can be applied to storage and preservation of perishable food; the method not only realizes waste utilization of fish scales, but also solves the problem that the prepared product is easy to be infected by microorganisms and spoilage, and achieves a remarkable technical effect. In addition, the invention has the advantages of safety, environmental protection, simple preparation method, easy popularization and application, and very wide application prospect.

The invention provides a spherical graphite material and a preparation method and application thereof, and the spherical graphite material meets the following conditions: the r value of the spherical graphite material is gt; 0.7, the sphericity degree of the spherical graphite material is larger than or equal to 0.75, 10 30 nm * 30 nm areas are randomly selected for any cross section of particles of the spherical graphite material, TEM images are obtained respectively, and graphite lattice layer-amorphous carbon layer-graphite lattice layer crystal form change areas exist in the TEM images of not larger than 3 areas. The prepared lithium-ion battery cathode material has the characteristics of high tap density and small orientation, so that the lithium-ion battery cathode material shows excellent processability, and shows the characteristic of low expansion when being applied to the lithium-ion battery cathode material. The graphite material is high in graphitization degree, and shows the characteristics of high capacity and high first efficiency when being applied to a lithium ion battery negative electrode material.

The utility model discloses a nursing device capable of promoting gastrointestinal tract peristalsis and relieving abdominal distension, which comprises a fixed frame, longitudinal supports are fixed at four corners of the bottom of the fixed frame, a transverse support is slidably connected between two longitudinal supports on adjacent sides, a sliding plate is slidably connected between two transverse supports, and the sliding plate is slidably connected with the fixed frame. A massage assembly is arranged below the sliding plate. The massage assemblies are arranged in multiple groups and are adjustable in height, the design is used for adapting to the curve of the abdomen of a patient and achieving the sufficient massage effect, the distance between the massage ball head and the skin of the abdomen of the patient can be lengthened or shortened by controlling the electric push rod, the massage ball head can be better attached to the body of the patient, and the massage effect is better. When one side of the abdomen of a patient is massaged, the massage ball head can be attached to the body of the patient, so that the whole abdomen of the patient can be fully massaged, the massage effect is better, and then gastrointestinal peristalsis of the patient can be better promoted, gastrointestinal exhaust is helped, and abdominal distension is relieved.

The invention discloses a lithium ion battery cell with ultrahigh energy density and a preparation method thereof. The negative electrode of the battery cell is prepared from the following raw materials: graphite, silicon carbon, conductive carbon black, polyacrylic acid, butadiene styrene rubber and single-walled carbon nanotubes. According to the battery cell negative electrode disclosed by the invention, a silicon-carbon material is used as a novel gas-phase silicon-carbon material, so that a silicon-based material can be reduced to a nanometer level, and more gaps can be formed for buffering stress and deformation generated by silicon in a lithium ion de-intercalation process; a porous carbon skeleton structure is adopted, a silicon expansion space is fully reserved, in addition, a double-layer carbon coating technology can inhibit silicon expansion, and the conductivity of the material is improved; the single-walled carbon nanotubes can inhibit the expansion of the silicon material and improve the conductivity by forming a reticular conductive network; polyacrylic acid can be combined with graphite and silicon carbon surface functional groups through carboxyl to promote the formation of an SEI film, so that the cycle performance is improved, and the negative electrode expansion is reduced. The gram capacity of the prepared battery negative electrode can reach 400 mAh / g or above, the first efficiency reaches 93%, and the battery negative electrode has high energy density and good cycle performance.

The invention provides a silicon-carbon composite negative electrode material as well as a preparation method and application thereof, and relates to the technical field of electrode materials, the silicon-carbon composite negative electrode material sequentially comprises nano silicon, porous hard carbon, porous metal and a carbon coating layer from inside to outside; pores of the porous metal are filled with the porous hard carbon, and the nano silicon is distributed in the pores of the porous hard carbon; and the carbon coating layer is coated on the surfaces and pores of the porous metal and the porous hard carbon. The technical problems of low battery energy density and poor cycle performance caused by low conductivity, easy crushing and high charging volume expansion of the existing silicon-carbon negative electrode material are solved, the technical effects that the silicon-carbon negative electrode material has relatively high initial efficiency, relatively low charging volume expansion and relatively long cycle are achieved, and when the silicon-carbon negative electrode material is applied to the lithium ion secondary battery, the service life of the lithium ion secondary battery is prolonged. The first efficiency and the cycle life of the lithium ion battery can be effectively improved.

The present application discloses a lithium-ion battery and an electronic device, and relates to the technical field of lithium-ion batteries. The lithium-ion battery comprises a negative electrode plate, and the negative electrode plate comprises a silicon-carbon material, wherein the silicon-carbon material contains a hydrogen element, and the mass percentage of the hydrogen element is a% based on the mass of the silicon-carbon material. The present application controls the content of the hydrogen element in the silicon-carbon material within a suitable range, thereby reducing the side reaction between the silicon-carbon material and the electrolyte, and improving the long-term cycle stability of the lithium-ion battery.

The invention provides porous carbon with a secondary particle configuration, a preparation method and application of the porous carbon, a gas-phase silicon carbon material and application of the gas-phase silicon carbon material, and relates to the technical field of porous carbons.The method comprises the steps that a carbon source is subjected to a polymerization reaction, primary particles are generated firstly, the primary particles are fused again, and a secondary particle hard carbon precursor is obtained; carrying out pyrolysis carbonization on the secondary particle hard carbon precursor, and then carrying out activation treatment to obtain porous carbon with a secondary particle configuration; the porous carbon with the secondary particle configuration is applied to the gas-phase silicon-carbon material, so that the technical problems of limited expansion improvement and rate increase of the existing gas-phase silicon-carbon material due to the fact that the porous carbon is of a single-particle structure are solved, and the technical effects of effectively reducing the charging volume expansion and remarkably improving the rate performance are achieved.

The application discloses a kind of postoperative drainage device of colorectal surgery with pressure reduction structure, including negative pressure ball, drainage catheter, buffer pressure reduction component and drainage end row, drainage catheter inside is equipped with liquid flow channel and airflow channel, buffer pressure reduction component includes shunt bottle and guide pipe, shunt bottle inner wall inside is equipped with air chamber, inner wall surface is equipped with a plurality of annular liquid separation gas permeable membrane, guide pipe is bent back flow shape and with shunt bottle forms integrated inverted bucket shape sealed bottle structure, so that liquid is deposited to shunt bottle lower area preferentially, while gas is gathered in upper area and then enters air cavity through liquid separation gas permeable membrane and is discharged along airflow channel, realize gas-liquid shunt pressure reduction.The application can form stable gas-liquid separation path without complex mechanical valve structure, can reduce the risk of viscous fecal plug, and maintain continuous exhaust pressure reduction effect in different body position state of patient, to reduce postoperative abdominal distension and anastomotic stoma pressure risk.

The invention provides a preparation method for compounding a HE-Fe3Se4 / Se heterojunction on Mxene as a high-performance sodium ion battery anode material. The preparation method specifically comprises the following steps: step 1, synthesizing a high-entropy Prussian blue composite MXene material; and 2, synthesizing the HE-Fe3Se4 / Se / MXene anode material by adopting the high-entropy Prussian blue composite MXene material.

The invention discloses an optical filter for realizing a medium-wave infrared focal splitting plane on a metasurface and a reverse design method. According to the light field regulation and control characteristics of the metasurface, spectrum routing and focusing functions of a specified medium-wave infrared wave band can be completed only by using the single-layer all-silicon medium metasurface, so that the filtering effect similar to that of a Bayer optical filter is achieved, the spectrum energy utilization rate is remarkably improved compared with that of the Bayer optical filter, an end-to-end reverse method is used in the design thought, and the design cost is reduced. Structural parameters are optimized in a staged mode through a genetic algorithm and a binary search algorithm (DBS), the advantages of all the algorithms are brought into full play, the design threshold is lowered, the optimization freedom degree is improved, and therefore the optimization performance can be improved. Therefore, key device support can be provided for low-illumination mid-infrared night vision color imaging application, and a new design thought is expanded for the technical field of integration and miniaturization.

The invention discloses a newborn nasal feeding fixing frame, and relates to the technical field of medical instruments. The stomach tube fixing device comprises a box body, a connecting tube, limiting mechanisms and a stomach tube fixing mechanism, the limiting mechanisms are fixed to the front side and the rear side of the outer side wall of one side of the box body, the connecting tube is inserted into the other side wall of the box body, the stomach tube fixing mechanism is arranged at the outer end of the connecting tube in a sleeving mode, and a flow control valve is arranged on the connecting tube and arranged in the box body. A pumping pump is fixed to the inner side wall of one side of the box body, a water outlet of the pumping pump is connected with the connecting pipe, and a liquid inlet pipe is connected to a water inlet of the pumping pump. When the stomach tube is conveniently fixed, the injection speed is controlled, sudden increase of contents in the stomach of a child patient cannot be caused, gastrointestinal dysfunction cannot be caused, abdominal distension, vomiting and other complications are reduced, and the stomach tube has the advantages of being reasonable in arrangement, low in manufacturing cost and the like.

The invention provides a pole piece of a lithium ion battery and a preparation method of the pole piece, the pole piece of the lithium ion battery comprises a current collector and an active material coated on the current collector, and by arranging the active material and an adhesive, the active material can be conveniently and rapidly fixed when being extruded and arranged on the current collector along an angle; the assembly state of the active material on the current collector is stabilized, the active material is placed in the slit die cavity to be extruded, the active material moves and deforms towards the single side direction, so that the structure becomes long and narrow, and the end part of the long and narrow active material is connected with the current collector to be rolled, so that the tortuosity of the lithium ion battery pole piece is reduced, and the service life of the lithium ion battery pole piece is prolonged. And the migration rate of lithium ions in the pole piece and the embedding rate of the lithium ions in the active material are accelerated, meanwhile, the problem that the pole piece is expanded and increased due to lithium ion embedding in the thickness direction of the pole piece is solved, and the probability of deformation of the lithium ion battery is reduced.

This disclosure provides a negative electrode, an electrochemical device, and an electronic device. The negative electrode includes: a current collector; and an active material layer located on the current collector; wherein the active material layer comprises a silicon-based material, and the minimum mass ratio of silicon element in the active material layer at different locations within the same area is X1, the maximum mass ratio is X2, and the value of X1 / X2 is M, where M ≥ 0.7; wherein the minimum weight loss ratio of the active material layer at different locations within the same area via thermogravimetric analysis (TG) at 800°C is Y1, the maximum weight loss ratio is Y2, and the value of Y1 / Y2 is N, where N ≥ 0.7. This disclosure improves the rate performance and cycle performance of the electrochemical device and reduces the expansion of the electrode assembly by uniformly dispersing the silicon-based material and binder in the active material layer.