16results about How to "Improved kinetics" patented technology

The invention relates to the technical field of battery materials, in particular to a graphite negative electrode material and a preparation method and application thereof. The graphite negative electrode material comprises graphite particles, the average length La of the graphite particles in the alpha-axis direction of microcrystals is larger than or equal to 40 nm, the average thickness Lc of the graphite particles in the c-axis direction of the microcrystals is larger than or equal to 25 nm, and the interlayer spacing d002 ranges from 0.336 nm to 0.338 nm, and the number parameter of the microcrystals contained in each single graphite particle is defined as N = D503 / (La2 * Lc); d50 is the median particle size of the graphite particles, the unit is [mu] m, and the numerical value of N is more than 0 and less than or equal to 0.04. The graphite negative electrode material disclosed by the embodiment of the invention comprises the graphite particles with stable microcrystalline structure, large microcrystalline size and large interlayer spacing, so that the expansion and stress distribution uniformity of the negative electrode material in the circulation process is improved, the diffusion of ions in the graphite particles is facilitated, the consumption of active lithium is reduced, and the service life of the negative electrode material is prolonged. And the dynamic and super-long cycle stability of the graphite negative electrode material is improved.

The invention relates to a negative pole piece, a winding battery cell and a lithium ion battery. The negative pole piece comprises a first active coating coated on one side of a negative current collector and a second active coating coated on the other side of the negative current collector, the first active coating is an active coating coated by the positive pole piece when the negative pole piece is wound, and the surface density of the first active coating is greater than that of the second active coating; the first active coating and the second active coating comprise an inner side active coating close to the negative electrode current collector and an outer side active coating coated on the surface of the inner side active coating; the outer active coating comprises a first negative electrode active material, the inner active coating comprises a second negative electrode active material, and the second negative electrode active material comprises a silicon-carbon negative electrode material and the first negative electrode active material; and the surface density of the outer active coating is smaller than that of the inner active coating. According to the scheme provided by the invention, the lithium precipitation phenomenon in the arc region of the negative electrode plate of the lithium ion battery can be effectively prevented, and the cycle performance of the lithium ion battery is improved.

The invention discloses a binary and multi-component TM-MOFs@MgH2 composite hydrogen storage material and a preparation method thereof, which belongs to the technical field of novel hydrogen storage materials. The binary and multi-component TM-MOFs@MgH2 composite hydrogen storage material preparation method provided comprises the following steps: S1, preparing a binary and multi-component transition metal TM-MOFs precursor; S2, preparing a composite hydrogen storage material: pre-ball milling the TM-MOFs precursor obtained in step S1, adding MgH2 powder material, ball milling, placing the ball-milled mixture powder in a vacuum environment for complete dehydrogenation, and obtaining a binary and multi-component TM-MOFs@MgH2 composite hydrogen storage material. Compared with pure MgH2 hydrogen storage materials, the binary and multi-component TM-MOFs@MgH2 composite hydrogen storage materials provided by the invention have a smaller reduction in hydrogen storage capacity, a significantly reduced hydrogen absorption and desorption reaction temperature, and greatly improved kinetics, which significantly improves the catalyst catalytic efficiency and the practicality of the hydrogen storage material.

The invention discloses a polycrystalline phase SnSe / NiSe / Ni3Se2 hybrid nanorod array material as well as a preparation method and application of the polycrystalline phase SnSe / NiSe / Ni3Se2 hybrid nanorod array material. According to the method, Se powder is reduced into a transparent solution through NaBH4 in an N2 saturated atmosphere, then a mixed solution of SnCl2. 2H2O and NaOH, an NH4F solution and foamed nickel are added, and the polycrystalline phase SnSe / NiSe / Ni3Se2 hybrid nanorod array electrocatalyst growing on a foamed nickel framework in situ can be obtained through a high-temperature hydrothermal reaction. The preparation process is simple and environment-friendly, the raw materials are easy to obtain, the synthesis controllability is high, and the product repeatability is good. The prepared advanced polycrystalline phase SnSe / NiSe / Ni3Se2 hybrid nanorod array has a specific active component and a uniform morphology structure, and is easy to prepare at high throughput. Meanwhile, the uniform nanorod array structure has a large specific surface area, can provide more reaction active sites, shows excellent electrocatalytic urea oxidation reaction, hydrogen evolution reaction and urea oxidation reaction assisted water electrolysis catalytic performance, and provides important assistance for the development of the field of efficient and energy-saving hydrogen production.

The present invention provides a slurry composition for a thick negative electrode, a preparation method and an application thereof. The slurry composition comprises the following components by mass percentage: 91.8%-98.9% of a negative electrode active material, 0.1%-2.2% of a dispersant, 0.5%-3% of an adhesive, 0.4%-5% of a conductive agent and 0.1%-8.5% of an aqueous solution of a modified silicone oil composition. The present invention adds an aqueous solution of a modified silicone oil composition to the slurry composition for a thick negative electrode, and the aqueous solution of the composition can effectively improve the cracking and curling of the electrode during the negative electrode coating process, thereby improving the process excellence rate of the negative electrode electrode, and further improving the consistency of the electrode performance.

The invention provides a silicon-based material, an electrochemical device and electronic equipment, the silicon-based material comprises a silicon-carbon material and a silica material, and the average particle size D150 of the silicon-carbon material and the average particle size D250 of the silica material meet the following conditions: 1.8 lt; d < 150 > / D < 250 lt >; 10, and D150 is 4 [mu] m to 10 [mu] m. The negative electrode material provided by the invention can reduce the volume expansion of the electrochemical device after circulation, and improve the volume energy density and cycle performance of the electrochemical device.

This invention discloses a sulfur-containing cathode material and its preparation method, belonging to the field of lithium-sulfur battery technology. The method uses a quaternary ammonium polymer containing nitrate as a cathode binder, dispersed with a conductive agent and a sulfur-containing cathode material in deionized water to obtain a cathode slurry. The slurry is then coated onto aluminum foil and vacuum dried to obtain a cathode sheet. The quaternary ammonium cation backbone in the binder can adsorb polysulfides, improving lithium-ion migration capacity, while simultaneously preventing the rapid and uncontrollable consumption of nitrate, thereby extending the lifespan of the lithium-sulfur battery.

The invention discloses a method for preparing a nickel-cobalt hydroxide nanosheet, wherein 2-methylimidazole and a cobalt salt are dissolved in water respectively, and nickel foam is added after mixing, and the Co-ZIF nanosheet is obtained by stirring the reaction, and the Co-ZIF nanosheet and the nickel salt are mixed in ethanol, and the final product is obtained by constant temperature stirring. The method is simple, convenient, and environmentally friendly, and the prepared hollow triangular nickel-cobalt hydroxide nanosheet is conducive to the contact between the electrolyte and the electrocatalytic material, has good OER catalytic performance, and is highly stable.

The invention discloses a magnetic field assisted anionic membrane electrolysis hydrogen production device and a hydrogen production method. The magnetic field assisted anion membrane electrolysis hydrogen production device comprises an anion exchange membrane, an anode for oxygen evolution reaction, a cathode for hydrogen evolution reaction and an end plate, and the cathode and the anode are both made of magnetic nickel-grade catalysts; two sides of the anion exchange membrane are respectively assembled with the cathode and the anode to form a gas diffusion layer and a membrane electrode; two end plates are arranged on the two sides of the membrane electrode respectively, and two permanent magnets are arranged on the outer sides of the two end plates in parallel and apply magnetic fields to the cathode and the anode respectively. According to the method, a mature magnetic nickel-grade catalyst and an anion exchange membrane are respectively used as a working electrode and a diaphragm, and a magnetic field is applied under the condition of high current density, so that on one hand, the nucleation and desorption rate of bubbles under the condition that charged gas accelerates the high current density under the action of Lorentz force is optimized; on the other hand, the spin polarization of the magnetic nickel-based catalyst is optimized, so that the energy conversion efficiency is improved, and the hydrogen production energy consumption is reduced.

The invention provides a non-combustible and ultralow-temperature sodium-ion battery electrolyte as well as a preparation method and application thereof, and belongs to the technical field of sodium-ion batteries. The phosphate ester solvent with excellent flame retardance is matched with the weak-polarity diluent to serve as the main solvent, and the main solvent, the ionic liquid and the sodium salt obtain the non-combustible wide-temperature sodium-ion battery electrolyte capable of operating at the temperature ranging from the room temperature to-60 DEG C. Besides, the solvent-solvent strong interaction between the weakly solvated diluent and the strongly solvated phosphate in the system weakens the interaction between Na < + > and the strong solvent, so that the sodium ion kinetics is improved, the Na < + > solvated structure is further regulated and controlled by anions and cations of the ionic liquid, and the stability of the system is improved. And the safety performance of the battery can be improved due to the flame retardance and high electrochemical window of the ionic liquid. The electrolyte provided by the invention realizes high magnification and high cycle stability at room temperature, and also shows relatively high capacity at a low temperature of-60 DEG C.

The invention discloses a dual-thermal-conductivity boiling optimization surface based on embedded epoxy resin square blocks. The dual-thermal-conductivity boiling optimization surface comprises latticed epoxy resin arranged on a metal surface and the epoxy resin square blocks located in closed lattices. On the basis of the reticular epoxy resin, the epoxy resin square blocks are embedded in each independent metal area, so that a supplementary path for cold fluid to flow outwards from the center of an independent copper area is increased, the wetting effect of the epoxy resin is enhanced, and a higher boiling heat transfer coefficient h and a higher critical heat flux (CHF) are obtained.

The invention relates to an air intake assembly of a front trim (11) of a vehicle (10), comprising: an air intake element (2) having at least one air intake opening (3), and at least one adjustable damper (4), the damper being movable into an open position and a closed position, the damper (4) releasing the air intake opening (3) in the open position and closing the air intake opening (3) in the closed position, and the damper (4) being constructed in two parts and having two flip elements (41, 42) that can be adjusted in opposite directions.

The invention discloses an electrolyte additive, an electrolyte and a battery, the electrolyte additive comprises a first additive, the first additive comprises a compound represented by a formula (1): # imgabs0 #, m and n are integers, m is more than or equal to 1 and less than or equal to 20, and n is more than or equal to 1 and less than or equal to 20; r1 and R2 comprise any one of a halogen substituent group and a substituted or non-substituted alkyl group; r1 or R2 is a substituted or non-substituted alkyl group, and the number of carbon atoms of the alkyl group is not greater than 5. Compared with the prior art, the first additive containing the compound shown in the formula (1) can slow down crystal structure distortion and interface side reaction caused by transition metal dissolution, meanwhile, polyfunctional groups of the compound shown in the formula (1) can synergistically act on a battery system, and the positive effect on the high-temperature storage performance and the cycle performance of the battery is achieved.

The invention provides an antibacterial surface segregation covalent organic framework as well as a preparation method and application thereof, and relates to the field of separation membrane materials. The organic framework material disclosed by the invention is prepared by taking a covalent organic framework nanosheet with an internal antibacterial function as a segregation agent, physically blending the covalent organic framework nanosheet with a polymer matrix and utilizing a non-solvent induced phase separation process. The method comprises the following steps: firstly, synthesizing a covalent organic framework nanosheet dispersion liquid through a single-phase method, then blending the covalent organic framework nanosheet dispersion liquid with a high polymer material to prepare a membrane casting liquid, and finally, constructing a compact functional skin layer on the surface of the membrane and in pore channels through a non-solvent phase inversion process by utilizing the spontaneous surface segregation effect of covalent organic framework nanosheets in a phase separation process. The prepared membrane is of a typical asymmetric structure, and the antibacterial rate of the membrane on escherichia coli is high; the developed finger-shaped pore structure endows the membrane with high flux characteristic. The method effectively solves the problem of membrane biological pollution in the field of water treatment, and has the synergistic advantages of high flux, high interception and efficient antibiosis.

The application relates to a composite positive electrode material, a preparation method and a full-solid-state lithium selenium battery, which comprises the following steps: under the condition that the ball milling speed is 300 rpm-700 rpm and the ball milling time is 15 h-25 h, raw materials are subjected to ball milling treatment, so that the raw materials react in situ to generate an interface layer, and a composite positive electrode material is obtained; the raw materials comprise a positive electrode active substance, a Se-containing argyrodite solid-state electrolyte and a conductive agent; the positive electrode active substance comprises at least one of Se single substance and porous carbon loaded Se single substance, and the interface layer comprises a LiPSe compound. The application can solve the problems of poor interface stability and insufficient ion and electron conduction performance caused by solid-solid interface contact in the positive electrode material in the related art, and improves the energy density, rate, cycle life and other performances of the battery.