7results about How to "Reduce tortuosity" patented technology

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 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 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 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.