16results about How to "Reduce tortuosity" patented technology

The invention relates to a titanium carbide thin film material, a preparation method and a zinc ion hybrid capacitor, and the preparation method of the titanium carbide thin film material comprises the following steps: mixing titanium carbide nanosheets with an aqueous solution of ammonium salt, carrying out ultrasonic treatment, carrying out solid-liquid separation, and taking the supernatant liquid to obtain an intercalated titanium carbide nano colloid; adding a water-soluble salt into the intercalated titanium carbide nano colloid, reacting, carrying out solid-liquid separation, washing with water, and drying to obtain titanium carbide aerogel; and carrying out compression molding on the titanium carbide aerogel to obtain the titanium carbide film material. The super-wrinkled titanium carbide film prepared through a nanosheet distortion strategy has obviously improved compression resistance. Under the pressure of 1MPa, the microstructure of the electrode material does not change. In addition, the titanium carbide thin film material has lower tortuosity and can be directly used for constructing an electrode, ion transmission can be accelerated, the dynamic performance of the electrode is remarkably improved, and the requirement for high-quality load application is met.

The invention relates to the technical field of solid-state secondary batteries, and provides a solid-state secondary battery positive electrode, a solid-state secondary battery positive electrode preparation method and a solid-state secondary battery. A first layer on the positive current collector; the first layer comprises positive electrode small particles, solid electrolyte small particles, a conductive agent and a binder; a second layer on the first layer; the second layer further comprises positive large particles, solid electrolyte small particles, a conductive agent and a binder; a third layer on the second layer; the third layer comprises positive electrode small particles, solid electrolyte large particles, a conductive agent and a binder; the micron-sized holes are distributed in the first layer, the second layer and the third layer; the micron-sized holes are filled with solid electrolyte small particles, a conductive agent and a binder; the millimeter-level holes penetrate through the first layer, the second layer and the third layer, and the millimeter-level holes are filled with small solid electrolyte particles, a conductive agent and a binder. The flexibility of a lithium ion transmission path is reduced, and the rate capability is improved.

The present invention provides a low-tortuosity thick electrode and a preparation method and application thereof, wherein the low-tortuosity thick electrode comprises a current collector and an active coating layer disposed on at least one side of the current collector, wherein the active coating layer comprises an electrode active material and a porous binder. The thick electrode of the present invention contains a porous binder, and the binder with a porous structure can improve the mixing uniformity with the electrode active material, reduce the internal resistance, and improve the rate performance. Moreover, after heat treatment, the binder is in full contact with the electrode active material, and there is no binder migration, which can improve the peel strength of the electrode sheet; at the same time, the porous binder can form uniform pores after heat treatment, and the pores are uniformly formed. The continuous through-hole structure formed by the porous binder can significantly reduce the tortuosity of the thick electrode, and improve the liquid phase transmission efficiency of the electrolyte. The prepared low-tortuosity thick electrode has good rate performance and cycle performance.

The present invention discloses a preparation method and preparation equipment of a dry electrode film. The preparation method of the dry electrode film comprises providing a pair of first rollers with a roller diameter of d1, setting the pressure of the first rollers to t1, rolling the fibrous powder by the pair of first rollers to obtain an initial film of initial thickness; providing a pair of second rollers with a roller diameter of d2, and d2<d1, setting the pressure of the second rollers to t2, and t2<t1, and performing primary thinning on the initial film by the pair of second rollers to obtain a secondary film of secondary thickness; providing at least a pair of third rollers with a roller diameter of d3, and d3>d1, setting the pressure of the third rollers to t3, and t3>t1, and performing secondary thinning on the secondary film by the third roller to obtain a target film of target thickness. The target film prepared in this embodiment has better strength and more suitable toughness characteristics.

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.

The utility model relates to the technical field of secondary batteries, and provides a pole piece and a battery. The pole piece comprises a current collector, an active substance layer arranged on the surface of the current collector and an inorganic particle layer arranged on the surface, far away from the current collector, of the active substance layer, wherein the particle size of inorganic particles in the inorganic particle layer is 10-50 nm; the inorganic particle layer and the active material layer are provided with grooves. The battery formed by the pole piece disclosed by the utility model is high in energy density, high in capacity retention ratio and high in charging speed.

This invention discloses a positive electrode sheet, its preparation method, and its application. The positive electrode sheet includes a positive current collector and a porous positive electrode coating disposed on at least one side surface of the current collector. The pores in the porous positive electrode coating are formed by the volatilization of volatile solid additives under gradient heating conditions. The volatile solid additives include at least one of 1,8-dichloronaphthalene, 3,5-dichlorobromobenzene, and 1,4-dibromo-2,5-difluorobenzene. The gradient heating includes first gradient heating and then gradient cooling. This invention, by selecting volatile solid additives with large molecular volume and good crystallinity and using a gradient heating and then gradient cooling method to form pores in the positive electrode sheet, can improve porosity, which is beneficial to improving the wetting effect of the electrolyte on the positive electrode sheet. It can also control the morphology of the pores, reduce tortuosity, improve the structural stability of the electrode sheet, and thus improve the performance of the positive electrode sheet.

The present disclosure relates to a negative electrode and a method of manufacturing the same. The negative electrode includes a silicon-based negative electrode active material and a carbon-based negative electrode active material to have excellent charge / discharge capacity and energy density, and to have excellent fast charging performance and lifespan characteristics because the carbon-based negative electrode active material included in each negative electrode active layer is oriented to have a predetermined inclination with respect to a negative electrode current collector.

The application belongs to the field of high polymer materials, and provides a water-permeable and air-permeable sponge and a preparation method thereof. The application adopts a synergistic design of a crosslinked polydimethylsiloxane continuous phase and a directional through-hole network, forms a through-hole network with an open hole rate of 85-92% and an orientation index not less than 0.60 through directional soluble particle template dissolution, and introduces cellulose nanocrystals with a mass fraction of 0.50-2.00% modified by silane coupling to enhance the network, and covalently fixes 0.10-1.00 wt% of hydrophilic functional silane to realize surface hydrophilic modification, realizes air permeability not less than 400 L·m⁻²·s⁻¹, a pore size gradient of 150-250 μm on the near-skin side to 400-600 μm on the far-skin side, and double-medium high-flux water-permeable and air-permeable performance, solves the coupling contradiction problem between high open hole rate and mechanical bearing rebound attenuation, directional through-hole network cycle stability, and double-medium high-flux and low VOC, and has wide application value in the fields of nursing and sports underwear, masks, briefs, eye masks, shoes and mattresses.

The invention belongs to the field of catalysts, and relates to an alpha-alumina carrier and a preparation method thereof, a silver catalyst for ethylene epoxidation and an ethylene oxidation method. The preparation method of the alpha-alumina carrier comprises the following steps: preparing a solid mixture containing the following components: alpha-Al2O3 trihydrate, pseudo Al2O3 monohydrate, a pore forming agent, a combustible lubricating material, a fluoride mineralizer and an alkaline earth metal compound; wherein the pore forming agent is non-spherical organic polymer particles; the solid mixture, a binder and optional water are mixed, kneaded and subjected to extrusion molding, and a molded body is obtained; and drying and roasting the molded body to obtain the alpha-alumina carrier. According to the invention, non-spherical organic polymer particles with different forms are used as the pore-forming agent, the pore-forming agent has no residue in the roasting process of the carrier, a specific pore form can be formed, the connectivity between carrier pores is improved, the tortuosity is reduced, the permeability is improved, and the activity and selectivity of the catalyst can be obviously improved.

The present disclosure relates to a positive electrode sheet, a preparation method thereof, a battery and an electric device, the positive electrode sheet comprising a current collector and a positive electrode material layer disposed on at least one surface of the current collector, the positive electrode material layer comprising a positive electrode active material, a conductive agent, a binder and an anisotropic polymer; the anisotropic polymer comprising a cinnamate repeating structural unit. The positive electrode sheet of the present disclosure can improve the liquid phase transmission rate of lithium ions in the vertical direction of the electrode, reduce the tortuosity of the electrode, further improve the thickness of the electrode sheet, and improve the rate performance and cycle life of the battery.

This invention provides a novel dry-process electrolyte membrane, its preparation method, and its application, belonging to the field of solid-state battery technology. The electrolyte membrane is prepared by a dry film-forming process after combining a highly elastic and viscous halide with a solid electrolyte; the highly elastic and viscous halide includes Li3McXb6, derivatives of Li3McXb6, and Li... x Md y N 1‑ y Cl q and Li x Md y N 1‑y Cl q The electrolyte membrane comprises at least one of the following derivatives: Mc, In, Al, Ti, Y, Dy, Gd, Ge, Sc, Zr, and Yb; and Md comprises at least one of In, Y, Al, Zr, Sc, and Ge. This electrolyte membrane exhibits low porosity and high tensile strength, with a more compact internal structure, reducing internal defects in the battery. The increased tensile strength suppresses lithium dendrite penetration, preventing internal short circuits and thus achieving superior battery cycle performance.

The invention provides a negative composite electrode of a lithium ion battery, preparation of the negative composite electrode and the lithium ion battery. The negative composite electrode comprises a current collector, and a first active material layer, a bonding layer and a second active material layer which are sequentially arranged on the surfaces of the two sides of the current collector in the direction away from the current collector; the first active substance layer is composed of a first main material, a long-range conductive agent and a first binder; the bonding layer is composed of a second bonding agent, a conductive agent and a lithium conduction reinforcing material; and the second active substance layer is composed of a second main material, an oil absorption conductive agent and a third binder. According to the composite negative electrode, the tortuosity of a negative plate is relatively small under high compaction density, the lithium ion transmission capability is relatively high, the rebound rate is relatively low, and the bonding performance between layers is relatively good; therefore, the negative electrode composite electrode has good reaction kinetics performance, the risk of lithium separation is low, and the risk of separation between the layers is low; therefore, the lithium ion battery prepared from the negative electrode composite electrode has excellent cycling stability.

The invention provides a positive plate, a preparation method thereof and an all-solid-state battery. The positive plate provided by the invention comprises a positive active material and a sulfide electrolyte, the particle size D50 of the positive active material is 3-5 [mu] m, and D90 is less than or equal to 8 [mu] m; the sulfide electrolyte comprises a first sulfide electrolyte and a second sulfide electrolyte, the particle size D50 of the first sulfide electrolyte is 0.5-0.9 mu m, the particle size D90 of the first sulfide electrolyte is less than or equal to 1.2 mu m, the particle size D50 of the second sulfide electrolyte is 1-1.5 mu m, the particle size D90 of the second sulfide electrolyte is less than or equal to 1.8 mu m, and the mass ratio of the first sulfide electrolyte to the second sulfide electrolyte is 1: (0.1-0.5). According to the present invention, the particle sizes D50 and D90 of the positive electrode active material, the first sulfide electrolyte and the second sulfide electrolyte are cooperatively controlled, such that the sizes of the three material particles are reasonably matched so as to form the compact stacking structure, such that the high ionic conductivity is ensured, the ion transmission tortuosity is reduced, and the ion conduction is uniform and efficient.

The present invention relates to the field of new energy storage technology, and in particular to a low-rank coal-based two-dimensional porous nanosheet, a preparation method and an application thereof, wherein the low-rank coal is purified to obtain purified low-rank coal; the purified low-rank coal, a surfactant, an alkali and water are mixed, dried, subjected to high-temperature carbonization treatment, pickled, washed with water and dried to obtain a low-rank coal-based two-dimensional porous nanosheet. The preparation method is based on the special "graphene oxide-like" characteristics of low-rank coal, which is rich in aromatic structures and has a large number of oxygen-containing functional groups. The high-yield porous nanosheet is prepared by the structural induction of the surfactant, and then supplemented by the 2D structural design, which increases the electronic conduction characteristics of the porous nanosheet, thereby greatly improving the utilization efficiency of the electrode material in the electrochemical reaction, and the process is simple, the conditions are mild, the controllability is strong, and it is more conducive to industrial promotion and application. The problem of complex preparation process, high cost and low yield of porous carbon nanosheets existing in the prior art is solved.

The invention discloses a composite lithium supplementing material and a preparation method thereof, a positive electrode material and a secondary battery, the composite lithium supplementing material comprises a lithium-rich material and a functional material, the surface of at least one of the lithium-rich material and the functional material is provided with a modification ligand, and the lithium-rich material and the functional material are connected through the modification ligand. The modification ligand can reduce the agglomeration phenomenon of the lithium-rich material and the functional material so as to control the particle sizes of the lithium-rich material and the functional material, so that the overall particle size distribution of the lithium-rich material and the functional material is uniform, the electrochemical performance of the composite lithium supplementing material can be optimized, and the composite lithium supplementing material is more uniform in coating during application and is more stable in performance. Therefore, the tortuosity of the pole piece is greatly reduced, and the multiplying power and the cycle performance of the material are improved.