22results about How to "Small volume expansion" patented technology

The application relates to a silicon-carbon composite material and a preparation method thereof, a negative active material, a negative electrode sheet, a secondary battery and an electric device. The silicon-carbon composite material comprises porous carbon and a zinc silicate-silicon-oxygen-carbon composite material; at least part of the zinc silicate-silicon-oxygen-carbon composite material is filled in the pores of the porous carbon; the zinc silicate-silicon-oxygen-carbon composite material is of a porous structure; the pore diameter of the zinc silicate-silicon-oxygen-carbon composite material is 1-5 nm; and the mass content of zinc elements in the zinc silicate-silicon-oxygen-carbon composite material is 1-6%. The zinc silicate-silicon-oxygen-carbon composite material has proper pore diameter and zinc element content, is good in structural stability, and has low volume expansion rate and good conductivity. Since part of the zinc silicate-silicon-oxygen-carbon composite material is filled in the pores of the porous carbon, the volume expansion of the silicon-carbon composite material is further buffered. In the electrochemical cycle process, the silicon-carbon composite material has low volume expansion, and the cycle stability of the secondary battery can be improved.

The application provides a positive electrode material and a preparation method and application thereof. The positive electrode material is indicated by a gas generation index of the positive electrode material obtained based on a cumulative particle size distribution change rate of the positive electrode material after being pressed under different pressures. The positive electrode material has good structural stability and particle pressure strength, is not easy to break, can reduce the volume expansion of a battery, and improves the performance of the battery.

The embodiment of the present application relates to a kind of porous silicon-carbon composite material and its preparation method and application, the porous silicon-carbon composite material includes: porous silicon-carbon matrix, including as porous carbon matrix of porous carbon skeleton and the nano-silicon layer deposited on the outer surface and internal pore wall of porous carbon skeleton;Nano-fiber mesh passivation layer is the three-dimensional mesh structure that inorganic nano-fiber interweaves and overlaps each other;Nano-fiber mesh passivation layer is coated on the outer surface of porous silicon-carbon matrix, and / or in the internal pore of porous silicon-carbon matrix, to form passivation protection to nano-silicon layer;Carbon coating layer, coated on the outer surface of porous silicon-carbon matrix;Wherein, carbon coating layer at the outer surface of porous silicon-carbon matrix constitutes the outermost layer of porous silicon-carbon composite material.The porous silicon-carbon composite material is applied to lithium ion battery negative electrode, with the characteristics of high initial coulomb efficiency, low expansion rate.

The invention relates to the technical field of batteries, in particular to porous carbon. The invention provides porous carbon, the porous carbon comprises micropores, the percentage of the pore volume of the micropores in the total pore volume is greater than or equal to 85%, and in a pore distribution curve with the abscissa being the pore diameter and the ordinate being the differential pore volume dV / dW obtained by a nitrogen adsorption method test, the differential pore volume dV / dW of the porous carbon is greater than 0.05 cm < 3 >. G <-1 >. Nm <-1 > within the pore diameter range of 1-2nm. The porous carbon has proper microporosity and pore size distribution in Koelreuteria-shaped distribution, can effectively improve the silicon loading efficiency, reserves a part of space for volume enlargement caused by silicon expansion in the nanometer silicon circulation process, has the effect of relieving volume expansion when lithium is embedded into silicon, can reduce the volume expansion rate of the silicon-based negative electrode material, and improves the silicon-based negative electrode material performance. The cycling stability of the battery is improved.

A negative electrode for an electrochemical device and an electrochemical device including the same are provided. The negative electrode for the electrochemical device comprises: a current collector; and a negative electrode active material layer present on the current collector, wherein the negative electrode active material layer comprises particles containing a silicon-based active material, a linearly conductive material, and a binder for the particles, wherein the dispersion of the particles within the negative electrode active material layer is 1 × 10⁻⁶. ‑2 Up to 10×10 ‑2 The standard deviation of particle dispersion is 1×10⁻⁶. ‑3 Up to 4×10 ‑3 The volume expansion rate of the negative electrode active material layer is 3% to 30%.

This application relates to the field of battery technology, specifically to battery cells, battery devices, energy storage devices, and power consumption devices. In the negative electrode sheet of a battery cell, the negative electrode active layer includes a first active layer and a second active layer. The second active layer is disposed between the first active layer and the negative electrode current collector. The first active layer contains a first negative electrode active material, and the second active layer contains a second negative electrode active material. The sphericity of the first and second negative electrode active materials is independently 0.7~0.9, and their roundness is independently 0.42~0.65, respectively. Furthermore, the sphericity and / or roundness of the first negative electrode active material is greater than that of the second negative electrode active material. This application can improve the irreversible thickness growth of the negative electrode sheet during cycling and enhance kinetics, thereby helping to reduce the volume expansion of the cell throughout its life cycle while maintaining fast-charging performance.

The present invention relates to a uniformly modified silicon monoxide negative electrode material, and a preparation method therefor and the use thereof. The silicon monoxide negative electrode material comprises silicon monoxide and carbon atoms, wherein the carbon atoms are uniformly distributed in silicon monoxide at an atomic level; a carbon atom is bonded to a silicon atom to form an amorphous Si-C bond, and an X-ray diffraction (XRD) energy spectrum has no SiC crystallization peak; in solid-state nuclear magnetic resonance (NMR) detection of the uniformly modified silicon monoxide negative electrode material, the 29Si NMR spectrum shows that there is a resonance peak of Si-C between -10 ppm and -20 ppm; the average particle size D50 of silicon monoxide negative electrode material particles is 1 nm-100 µm, and the specific surface area is 0.5 m2 / g-40 m2 / g; the mass of the carbon atoms accounts for 0.1%-40% of the mass of silicon monoxide. According to the present invention, by using a gaseous method, carbon atoms are uniformly embedded into silicon monoxide at an atomic level, the material has small volume expansion in a lithium dis-embedding process, the conductivity coefficient for lithium ions is high, and the cycle performance and rate performance of the material are improved.

The composite-coated conversion positive electrode material comprises a conversion positive electrode base and a composite coating layer coated on the surface of the conversion positive electrode base, the conversion positive electrode base is M x S y , M a O, M b Z, M is at least one of Li, Fe, Cu, Ni, Mn, Co, Mo, Sn, Ti and W, Z is at least one of F, Cl and Br, the values of x, y, a and b vary according to the principle of electrical neutrality; the particle size of the conversion positive electrode base ranges from 30 nm to 25000 nm, the thickness of the composite coating layer accounts for 0.1% to 10% of the particle size of the conversion positive electrode base, the composite coating layer comprises an elastomer material and an electronic conductor material, the breaking elongation of the elastomer material is greater than or equal to 100%, and the tensile strength is greater than or equal to 5 MPa.

Provided are: a structure having a foamed resin layer, which is capable of forming the foamed resin layer in a short time; an interior body; and a method for manufacturing an electronic device. A base material (5) coated with a mixture (10) is accommodated in a cavity (4) of a mold (1). The mixture (10) contains an ultraviolet-curable adhesive and thermally expandable microcapsules. When the mold (1) is closed and the mixture (10) is irradiated with ultraviolet light, the adhesive resin component contained in the adhesive is polymerized, and the microcapsules are heated by heat generated in the polymerization reaction. A foamed resin layer (11) adhered to the substrate (5) is manufactured by expanding the heated microcapsules.

This invention provides a silicon-carbon anode material with an integrated embedded composite coating layer, its preparation method, and a lithium-ion battery, relating to the field of lithium-ion battery technology. The silicon-carbon anode material includes a silicon-carbon material core and a composite coating layer covering the surface of the core. The silicon-carbon material core comprises a porous carbon framework, nano-silicon dispersed within the porous carbon framework, and carbon nanomaterials grown in situ within the porous carbon framework. The composite coating layer comprises an elastic polymer matrix, and lithium salt and SEI film-forming additives distributed within the elastic polymer matrix. A portion of the carbon nanomaterials is embedded in the porous carbon, and another portion is embedded in the elastic polymer matrix, thereby forming a three-dimensional interlocking conductive network between the core and the coating layer. This invention solves the technical problems of volume expansion, SEI film instability, and kinetic sluggishness in silicon-based anode materials, achieving good cycle stability, high rate performance, and excellent structural integrity.

The application provides a kind of sodium ion battery negative electrode material and its preparation method and application.The negative electrode material includes black phosphorus, carbon carrier and sodium salt;The morphology of the carbon carrier is the morphology of LDH template;The black phosphorus and sodium salt are compounded in the carbon carrier;The carbon carrier is also doped with double metal ions, and the double metal is the double metal element in the LDH template.The negative electrode material provided by the application has multiple bonding effects between the carbon carrier, phosphoric acid, double metal ions and sodium salt, which ensures the stability of the material interface and effectively inhibits the volume expansion of black phosphorus during the cycle process;And the interaction between each substance, synergistic effect, makes the negative electrode material have excellent cycle stability and high reversible capacity, and also has good rate performance.

The application discloses a kind of negative electrode material and its preparation method and application, negative electrode material includes: porous Si C, silicon nanometer layer and carbon nanometer layer;Wherein, the layer number of silicon nanometer layer is greater than or equal to 1, the layer number of carbon nanometer layer is greater than or equal to 1;Negative electrode material uses porous Si C as framework, silicon nanometer layer and carbon nanometer layer are spaced distribution in the pore of porous Si C;The pore size of the pore of porous S i C is between 1nm-500nm;The thickness of silicon nanometer layer is between 1nm-50nm;The thickness of carbon nanometer layer is between 1nm-50nm;Lithium battery prepared by using the negative electrode material provided in the embodiment of the application has lower volume expansion rate, higher mass specific capacity, good conductivity and cycle life.

The application discloses a primary battery positive electrode material and a preparation method thereof. α Cu β Mn γ O2 material; wherein, 0<=alpha<=0.15; 0<=beta<=0.4; when beta>0, 1<=beta+gamma<=1.2; when beta=0, gamma=1, and the volume expansion in the sodium ion embedding process during the battery discharging process can be reduced.

The application belongs to the field of battery materials, and discloses a silicon-carbon composite material, a preparation method and application thereof. The silicon-carbon composite material comprises a porous carbon matrix, silicon particles, silicon nanowires and a hard carbon layer. The silicon particles are distributed in the pores of the porous carbon matrix and are bonded to the porous carbon matrix through Si-O-C chemical bonds. The silicon nanowires grow on the surface of the porous carbon matrix, and the surface layer of the silicon nanowires is carburized to form silicon carbide. The hard carbon layer at least coats part of the surface of the particles formed by the porous carbon matrix, the silicon particles and the silicon nanowires. The silicon-carbon composite material provided by the application realizes step-by-step effective regulation of the volume expansion of silicon at the microscale through a multi-stage synergistic mechanism, establishes a radial grading stress management network from the inside of the particles to the surface, and significantly reduces the overall volume expansion rate of the material. The silicon-carbon composite material realizes the synergistic consideration of high specific capacity, low volume expansion, long cycle life and excellent rate characteristics.

This invention relates to the field of battery technology, specifically to a negative electrode sheet for solid-state batteries, its preparation method, and the battery itself. The disclosed negative electrode sheet includes: a current collector, and a coating disposed on at least one surface of the current collector in the thickness direction; the coating includes a silicon-based material and a sulfide electrolyte material, the sulfide electrolyte material including Li7P2S8I electrolyte; the negative electrode sheet satisfies: 0.01≤a / (b×c)≤1; where a is the mass content of silicon in the negative electrode sheet, dimensionless; b is the mass content of iodine in the negative electrode sheet, dimensionless; and c is the expansion rate of the negative electrode sheet, dimensionless. The negative electrode sheet of this invention, by adding Li7P2S8I electrolyte to the silicon-based material, and simultaneously ensuring that the mass content of silicon and iodine in the negative electrode sheet satisfies the relationship with the expansion rate of the negative electrode sheet, gives the negative electrode sheet good conductivity and fast-charging performance.

The invention provides an application of coal gasification slag as a secondary battery negative electrode material, the coal gasification slag comprises hard carbon and ash, and the particle size of the coal gasification slag is 5-300 [mu] m. The coal gasification slag is used as a hard carbon-based negative electrode material and can accommodate a large amount of lithium ions, sodium ions or potassium ions, and only small volume expansion is generated while high specific capacity is achieved; secondly, the coal gasification carbon residue (namely hard carbon) in the coal gasification slag has relatively high electron and ion conductivity and can realize excellent rate capability, and furthermore, the coal gasification carbon residue (namely hard carbon) in the coal gasification slag has relatively high theoretical density and can realize relatively high area or volume energy density, so that the formed secondary battery has good comprehensive ion storage performance.

The invention discloses a pure-carbon-dioxide-resistant anti-explosion ternary fluororubber material and a preparation method of the pure-carbon-dioxide-resistant anti-explosion ternary fluororubber material. The material is prepared by taking ternary fluororubber raw rubber as a matrix, matching magnesium oxide, calcium hydroxide, light carbon black, thermal cracking carbon black, flaky calcium carbonate, a flaky air blocking agent, a WS280 processing aid, palm wax and a fluorine-linked 5 # vulcanizing agent, and carrying out plastifying and mixing, first-stage mold pressing vulcanization and second-stage drying oven vulcanization on the matrix and magnesium oxide, calcium hydroxide, light carbon black, thermal cracking carbon black, flaky calcium carbonate, flaky air blocking agent, WS280 processing aid, palm wax and fluorine-linked 5 # vulcanizing agent. Through the physical barrier effect of the flaky filler and the collaborative design of a specific vulcanization system, the anti-permeation and anti-bubbling performance of the material in a high-temperature and high-pressure pure COenvironment is remarkably improved, and meanwhile, good mechanical strength, suitable hardness and low-compression permanent deformation are kept. The preparation process of the material is compatible with traditional rubber processing, the process is stable and controllable, and the material is suitable for sealing parts under harsh working conditions such as carbon dioxide capture, utilization and storage and has a good industrial application prospect.

The invention discloses low-temperature high-fluorine-content carbon-dioxide-resistant anti-explosion fluororubber and a preparation method thereof. The fluororubber is prepared from the following components in parts by weight: 100 parts of low-temperature high-fluorine-content raw fluororubber, 15 to 25 parts of acetylene carbon black, 4 to 8 parts of triallyl isocyanurate, 2 to 5 parts of 2, 5-dimethyl-2, 5-di (tert-butylperoxy) hexane, 1 part of a processing aid and 20 to 35 parts of modified nano montmorillonite. The preparation method comprises the following steps: plastifying and mixing, adding a vulcanization system, performing first-stage mold pressing vulcanization, performing second-stage oven vulcanization and the like. Through the synergistic effect of a lamellar barrier structure of the nano-montmorillonite and a specific vulcanization system, the barrier property and explosion and pressure reduction resistance of the material to carbon dioxide are remarkably improved, and meanwhile, good low-temperature performance is still kept at the temperature of-40 DEG C or below. The material has high fluorine content, low-temperature performance and mechanical strength, is simple and convenient in process, and is suitable for sealing application in severe environments such as liquefied carbon dioxide storage and transportation, supercritical carbon dioxide process and the like.

The application discloses a negative electrode binder and a preparation method thereof, a pole piece and a battery, wherein a neutral chitosan solution and a PMMA emulsion are added into a PAALi emulsion, and are fully stirred and uniformly distributed to obtain the negative electrode binder. Through the synergistic compounding of the PAALi, the neutral chitosan and the PMMA, a modified silicon-carbon negative electrode binder is prepared, and the problems of cycle pulverization and capacity attenuation of a silicon-based negative electrode are effectively solved. The binder has the functions of dynamic elastic buffering, strong interface fixing and artificial protective layer, significantly improves the structural stability and cycle life of the pole piece, and is simple in preparation process, controllable in cost, convenient for large-scale production and suitable for the field of high-end new energy batteries.

The application provides a silicon-based composite material and a preparation method thereof, a negative electrode sheet and a secondary battery. The silicon-based composite material comprises a core and a coating layer covering the outer surface of the core. The core comprises a spherical framework and silicon particles. The spherical framework is a porous structure, and part or all of the silicon particles are accommodated in the porous structure of the spherical framework. The distribution density of the silicon particles decreases in a gradient from the center of the spherical framework to the outer surface of the spherical framework, and the particle size of the silicon particles increases in a gradient. The density and particle size of the silicon particles in the silicon-based composite material are distributed in a gradient, the expansion stress distribution of the silicon particles is optimized, the volume expansion rate of the silicon particles is reduced, the continuity of the ion path is maintained, and thus the initial efficiency, cycle life and rate performance of the secondary battery are improved.

The present application relates to a kind of porous carbon microspheres preparation method, porous carbon microspheres and its application, preparation method includes: water glass powder is mixed with water and stirred uniformly to obtain water glass solution, remove metal cation in water glass solution by cation exchange resin bed layer to obtain active silicic acid aqueous solution, using alkaline solution to adjust the pH value of active silicic acid aqueous solution to neutral, then react for a certain time at a certain temperature, obtain silica-containing silica sol, silica sol is mixed with carbon source material and is evenly sprayed dry, carbonization treatment obtains carbon microsphere powder material, then etching, washing, drying are sequentially carried out, remove silica, obtain porous carbon microspheres;The porous carbon microspheres of the present application can be used as carbon matrix to prepare silicon-carbon composite negative material, reduce the volume expansion of silicon, use the silicon-carbon composite negative material to prepare negative electrode sheet and assemble into lithium ion battery, can improve the first coulomb efficiency, rate performance and cycle stability of battery.

The application relates to a negative electrode sheet and application thereof, and the negative electrode sheet comprises a negative electrode current collector, a composite active layer located on at least one side of the negative electrode current collector, a protective film located on the side of the composite active layer away from the negative electrode current collector, and a passivation layer located between the negative electrode current collector and the composite active layer; the composite active layer comprises a three-dimensional skeleton with holes and a liquid alloy filled in part of the holes of the three-dimensional skeleton; the three-dimensional skeleton has a resilience rate of greater than or equal to 80%, and an average pore size of 100-200 nm; the liquid alloy has a melting point of less than or equal to 25 DEG C; the protective film comprises zero-dimensional nanocarbon materials and lithium diffusion materials; and the initial density of the protective film is greater than or equal to 85%. The negative electrode sheet has low volume expansion, the corrosion degree of the negative electrode current collector is low, and the creep of the material can be controlled to be Coble creep controlled by grain boundary diffusion, so that the cycle performance and safety of a corresponding solid-state battery are comprehensively improved.