6results about How to "Low areal density" patented technology

This application provides an electrode processing apparatus and method, belonging to the field of electrode processing technology. The electrode processing apparatus includes: a winding / unwinding device for conveying the workpiece to be processed from the unwinding side to the winding side; and a scribing device disposed between the unwinding and winding sides, used to form grooves on the uncompacted workpiece. The scribing device scribes lines on the uncompacted workpiece, making the scribing operation of grooves on the electrode coating easier and simpler, and increasing scribing efficiency.

This invention discloses a composite current collector, its preparation method, an electrode, and a battery, belonging to the field of lithium-ion battery technology. The composite current collector provided by this invention includes: a porous conductive matrix comprising a polymer and a first conductive filler dispersed in the polymer, prepared by differential roller stretching; a conductive layer disposed on at least one surface of the porous conductive matrix; and the conductive layer comprising a second conductive filler and a binder. The composite current collector of this invention achieves a significant reduction in electrode resistivity while maintaining excellent mechanical properties, effectively resolving the performance contradiction between lightweight and conductivity in traditional composite current collectors. The assembled lithium-ion battery exhibits high energy density, high cycle stability, and high safety.

This invention relates to a secondary battery, an electrode wetting method, and a method for preparing the secondary battery. From a product design perspective, this invention reduces the areal density and compaction density of the electrode, increases the number of stacked layers, establishes a correlation between electrode areal density, compaction, and the number of stacked layers and the electrode pore volume, and directionally increases electrode pores to provide channels and storage space for electrolyte penetration. Based on this, the electrolyte formulation is optimized, thereby improving electrolyte wettability and ultimately enhancing the battery's long-term cycle life and high-temperature storage performance.

This invention discloses a method for preparing a flexible PAN / TiO2 / rubber composite electromagnetic shielding film, characterized by the following steps: (1) using PAN and 6% TiO2 as precursors, a casting solution is prepared, and electrospinning is used to spin a 10μm~20μm film; (2) after pre-oxidation at 180℃~200℃ and carbonization at 1200℃~1500℃, a C@TiO2 electromagnetic shielding film is obtained; (3) using chloroprene rubber as a matrix, the C@TiO2 electromagnetic shielding film / rubber sheet is stacked layer by layer through dry lamination hot vulcanization method for 10 alternating times to obtain a flexible PAN / TiO2 / rubber composite electromagnetic shielding film.

The application provides a full-band three-dimensional wave-absorbing metamaterial, comprising a plurality of basic structure units arranged in a periodic array, wherein the basic structure unit comprises a first electromagnetic loss three-dimensional superstructure, a second electromagnetic loss three-dimensional superstructure, a third electromagnetic loss three-dimensional superstructure, a fourth electromagnetic loss three-dimensional superstructure, a fifth electromagnetic loss three-dimensional superstructure, a sixth electromagnetic loss three-dimensional superstructure and a metal back plate arranged in sequence from top to bottom; and a resistive frequency selective surface is loaded on each of the first electromagnetic loss three-dimensional superstructure, the second electromagnetic loss three-dimensional superstructure, the third electromagnetic loss three-dimensional superstructure, the fourth electromagnetic loss three-dimensional superstructure, the fifth electromagnetic loss three-dimensional superstructure and the sixth electromagnetic loss three-dimensional superstructure; the application has the following beneficial effects: the resistive frequency surface, the pure metal patch and the electromagnetic loss three-dimensional superstructure are combined for multi-dimensional coupling absorption design, so that the full-band absorption performance is realized in the L, S, C, X, Ku, K and Ka bands which have a high utilization rate at present, and a certain electromagnetic loss performance is still exhibited in the V and W bands; the thickness is relatively thin, the maximum oblique incidence angle is not less than 70 DEG, so that the demand of a thin-layer, low-area-density electromagnetic wave-absorbing material working in a full-band range at present is met.

In order to improve the lithium precipitation problem of a pole piece, the invention provides a battery cell and a battery, the battery cell comprises a positive plate and a negative plate, the positive plate comprises a positive current collector, a positive tab and a positive active material layer, the positive active material layer is arranged on at least one side of the positive current collector, and the positive tab is connected with the positive current collector; the negative plate comprises a negative current collector, a negative tab and a negative active material layer, the negative active material layer is arranged on at least one side of the negative current collector, and the negative tab is connected with the negative current collector; in the length direction of the negative plate, the coating surface density of the negative active material layer is gradually increased along the direction far away from the negative tab; and in any region of the battery cell, the ratio K of the coating surface density of the negative electrode active material layer to the coating surface density of the positive electrode active material layer at the corresponding position is more than or equal to 0.4 and less than or equal to 0.52.