13results about How to "Good mechanical integrity" patented technology

The application discloses a kind of composite sodium supplement agent and preparation method and application thereof, it is related to positive electrode sodium supplement agent preparation technical field, including the following process: sodium supplement agent is ground and mixed with conductive agent uniformly, then baking is carried out, to obtain the mixed material after baking;The mixed material after baking is ball milled, to obtain composite sodium supplement agent.The prepared composite sodium supplement agent of the application only needs a small amount of addition, which can significantly improve the initial charge specific capacity of half-cell, effectively compensating for the irreversible capacity loss in initial cycle.The preparation method provided by the application has the advantages of low cost, high performance, simple operation and high safety.

A negative electrode for a rechargeable lithium battery and a rechargeable lithium battery including the same are provided. The negative electrode includes: a negative electrode current collector including a carbon layer and a silicon layer, the carbon layer including a first porous substrate and a carbon-based material present inside the first porous substrate, and the silicon layer including a second porous substrate and a silicon-based negative electrode active material present inside the second porous substrate; and a negative electrode active material layer disposed on a surface of the negative electrode current collector and including a negative electrode active material.

The application provides a pore-forming agent for lithium ion batteries and a preparation method thereof, which comprises a wall material preparation step, a core material preparation step, a W / O type initial milk preparation step and a pore-forming agent for lithium ion batteries preparation step. The pore-forming agent preparation method is a new pore-forming agent synthesis route, which has the advantages of simple reaction steps, mild reaction conditions, high yield, low cost and environmental protection. The technology can accurately construct a uniform multi-level pore network by introducing the pore-forming agent into the electrode, significantly reduces the charge transmission impedance, effectively improves the fast charging capacity and high-rate discharge performance of the battery, greatly improves the electrode-electrolyte interface contact, and ensures the full use of the active material. The application also provides an application of the pore-forming agent for lithium ion batteries to lithium ion batteries. The application of the pore-forming agent for lithium ion batteries to the lithium ion batteries can improve ion conduction and improve the rate performance.

The application provides a battery and a power utilization device, which comprise a negative electrode sheet, the negative electrode sheet comprises a nickel element, the mass content of the nickel element is X, and the volume median particle size of the negative electrode active material is H; an electrolyte comprises a first additive, a second additive and a third additive, the mass percentage content of the first additive is A, the mass percentage content of the second additive is B, and the mass percentage content of the third additive is C; the values of A, B, C, H and X satisfy the following conditions: 0.001 <= (A+B) / X <= 0.83; 0.2 <= (A+B+C) / H <= 3.06; 0.18 <= C / (A+B) <= 3.2; in the application, (A+B) / X ensures the balance between the total amount of the additive and the pollution degree for the nickel impurity interface; (A+B+C) / H realizes the matching between the chemical protection of the additive and the negative electrode particle size; C / (A+B) balances the proportion of the basic film forming and the interface stable protection; the interface side reaction and the SEI film instability problem caused by the migration of the nickel element dissolution are effectively inhibited, so that the battery realizes the optimal balance between the thermal shock safety, the low-temperature cycle and the high-temperature cycle performance.

The invention provides a multi-layer composite film for an aerospace wire and a preparation method of the multi-layer composite film, and relates to the technical field of surface film layers. The preparation method comprises the following steps: placing a wire base material in an electrolyte for micro-arc oxidation treatment so as to form an insulating film on the surface of the wire base material; spraying nano dispersion liquid on the surface of the insulating film to form an intermediate layer; carrying out curing treatment on the middle layer to form a hydrophobic membrane; wherein the electrolyte comprises 5-30 g / L of sodium silicate, 0.1-2 g / L of cubic boron nitride, 2-20 g / L of sodium hexametaphosphate, 0.1-1 g / L of titanium aluminum nitride, 0.1-10 g / L of aluminum nitride and 0.1-2 g / L of sodium hydroxide. The performance of the film layer for the aerospace wire can be improved.

This invention relates to the field of battery technology, specifically to a composite separator and a lithium-ion battery. The composite separator comprises a porous polymer layer; a heat-resistant polymer layer disposed on the surface of the porous polymer layer; and an interfacial bonding layer disposed between the porous polymer layer and the heat-resistant polymer layer. The composite separator has an air permeability of 80s / 100mL to 350s / 100mL, a puncture strength ≥350gf, and a tensile strength ≥1400kgf / cm². 2 Compared with the prior art, the present invention utilizes an interfacial bonding layer to tightly bond the porous polymer layer and the heat-resistant polymer layer, so that the composite membrane can maintain dimensional stability at high temperatures and prevent electrode short circuits by relying on the skeleton support of the heat-resistant polymer layer, while maintaining an effective lithium-ion transport channel, thereby taking into account a safe membrane breakage temperature, low thermal shrinkage rate and high ionic conductivity.

This invention discloses a sulfonic acid-based polyethylene oxide solid proton exchange membrane, its preparation method, and its application. The solid proton exchange membrane includes a porous support layer and a sulfonic acid-based polyethylene oxide proton conductor layer loaded on its surface and / or within its pores. The proton conductor layer is formed by reacting or compounding polyethylene oxide or a polymer containing polyethylene oxide segments with an acidic reagent containing sulfonic acid groups or capable of introducing sulfonic acid groups, and contains fixed acidic proton sites and ether oxygen segments. The preparation method involves dissolving the polyethylene oxide polymer in a solvent and adding an acidic reagent to form a precursor solution, coating it onto the porous support layer, and obtaining the solid proton exchange membrane by drying, curing, or heat treatment. This membrane can constitute a dry-state electrochemical hydrogen purification membrane electrode assembly, achieving selective extraction or purification of hydrogen from a hydrogen-containing gas mixture without adding liquid acidic electrolyte or externally humidifying the inlet gas. This invention can form a continuous composite membrane, verifying its structural components, dry-state proton conductivity, and hydrogen purification applications.

The application relates to the technical field of lithium ion batteries, in particular to a high-entropy high-nickel cobalt-free precursor, a high-entropy high-nickel cobalt-free single-crystal positive electrode material and a preparation method thereof and a lithium ion battery. The high-entropy high-nickel cobalt-free precursor comprises a core layer and a high-entropy doped shell layer coated on at least part of the surface of the core layer; the core layer comprises a first nickel-manganese hydroxide; the high-entropy doped shell layer comprises a high-entropy doped second nickel-manganese hydroxide; and the doped elements in the high-entropy doped second nickel-manganese hydroxide include titanium, magnesium, aluminum, zirconium and molybdenum. The high-entropy high-nickel cobalt-free precursor provided by the application is coated with a high-entropy doped shell layer containing titanium, magnesium, aluminum, zirconium and molybdenum on the surface of the core layer containing the first nickel-manganese hydroxide, which is beneficial to reducing the exposure degree of {010} active crystal faces in the precursor, promoting the preferred growth of the positive electrode material along the (003) plane, and further improving the electrochemical performance and cycle stability of the high-entropy high-nickel cobalt-free single-crystal positive electrode material.

The invention discloses a phenolic resin microsphere-based porous carbon conductive composite material and a preparation method thereof, and belongs to the technical field of conductive materials. Phenolic resin microspheres with specific molecular weight and hydroxymethyl content are used as carbon precursors, nitrogen-doped carbon nanofibers are introduced to construct a continuous conductive network, a metal-ligand self-assembled mesoporous template agent is adopted to form ordered multilevel channels, and a skeleton structure is enhanced by virtue of a boric acid ester crosslinking aid. The preparation method comprises the steps of potential regulation and control dispersion of precursor slurry, alkaline steam aging forming and gradient pyrolysis carbonization in an inert atmosphere. The method avoids the use of strong corrosive reagents, and the process is environment-friendly. The obtained composite material has high specific surface area, excellent conductivity and good mechanical strength, effectively solves the technical problems that a traditional porous carbon material is disordered in pore structure, insufficient in conductivity and weak in mechanical property and is difficult to synergistically optimize, and has wide application prospects in the fields of supercapacitor electrodes, silicon-carbon negative electrodes and the like.

This utility model relates to the field of cable technology and provides a torsion-resistant cable, comprising: multiple conductors and a cross-shaped spacer, wherein the cross-shaped spacer is attached to the multiple conductors, a shielding layer is fixedly connected to the outer surface of the conductors, and a buffer layer is provided between the shielding layer and the cross-shaped spacer. It also includes: a reinforcing mesh, fixedly connected to the outer surface of the shielding layer; the multiple conductors are separated by the cross-shaped spacer to prevent them from tangling together and affecting the transmission of power signals; the shielding layer is fixedly connected to the outer surface of the conductors, and the shielding layer is made of copper foil, which has excellent conductivity and can effectively shield high-frequency electromagnetic interference; the buffer layer is provided between the shielding layer and the cross-shaped spacer, and the buffer layer is made of polystyrene foam, which has good shock absorption and cushioning performance, can absorb impact energy, and protect the internal conductors from damage; the reinforcing mesh can improve the flexibility of the cable body and prevent damage to the conductors.

The invention relates to a high-speed electric machine for a motor vehicle, comprising a stator and a rotor which is rotatably mounted relative to the stator along an axis, the stator comprising a stator yoke and stator teeth, the stator teeth being connected to the stator yoke in a force-fitting and / or form-fitting manner, the rotor comprises sheets which form a laminated core and are laminated in the axial direction, the laminated core comprises at least two receiving spaces in the radial direction relative to the axis, a permanent magnet is arranged in each receiving space, the corresponding permanent magnet is inserted in the corresponding receiving space in a force locking mode, and the permanent magnets are arranged in the receiving spaces. The laminated core with the permanent magnets has a circular outer contour in the radial direction with respect to the axis, wherein the rotor is enclosed by a retaining strip for fixing the permanent magnets in the laminated core.

The utility model provides a kind of electroreflective working electrode, the electrode includes substrate layer, the functional layer of metal material and the first stable layer of sulfide material, and first stable layer forms strong chemical bonding interface with functional layer by metal-sulfur bond. By constructing strong chemical bonding metal-sulfur bond, effectively solve the problem of weak interlayer adhesion, easy to peel off, significantly enhance the mechanical stability and interface integrity of electroreflective working electrode, thereby substantially prolong the service life and optical performance durability of electroreflective working electrode.

The invention discloses a preparation method of a boron nitride nanotube macroscopic body and a reactor, and the preparation method comprises the following steps: (1) providing a crucible with an opening in only one side, and pressing a boron source and catalyst powder on the wall surface, facing the opening, in the crucible; (2) placing the crucible in a heating zone of a heating reactor with the opening opposite to an air inlet; (3) introducing inert gas, and heating to a reaction temperature; (4) stopping introducing the inert gas, introducing a nitrogen source, and carrying out heat preservation for a preset time at the reaction temperature, so as to synthesize a boron nitride nanotube; and (5) stopping introducing the nitrogen source, introducing the inert gas again, and cooling the sample to room temperature to obtain the boron nitride nanotube self-supporting macroscopic body. The gas flow is regulated and controlled through the crucible structure to form controllable vortex, the gas-solid reaction process is optimized, efficient directional growth and macroscopic body self-assembly of the BNNT are achieved, the product yield is increased by magnitude order compared with that of a traditional method, and excellent mechanical integrity and machinability are achieved.