3D foil material, preparation method and application of positive plate and negative plate containing same

Abstract

The invention provides a 3D foil material, a preparation method and an application of a positive plate and a negative plate containing the same. The 3D foil material comprises a base material, wherein multiple first through holes are formed in the middle of the base material; lug bosses are arranged on the peripheries of the first through holes in the base material; the lug bosses and the base material are formed integrally; second through holes are formed in the lug bosses; the side walls of the second through holes are parallel to the side walls of the lug bosses; the second through holes are communicated with the first through holes; the pore diameter, far from the second through hole end, of the first through holes is greater than or equal to that in the connecting place between the first through holes and the second through holes; and the pore diameter in the connecting place between the first through holes and the second through holes is greater than that, far from the first through hole end, of the second through holes. The 3D foil material provided by the invention adopts a mechanical stamping and punching way, so that the foil material is endowed with the three-dimensional structure including the first through holes, the second through holes and the lug bosses; and therefore, the adhesive force between the foil material and slurry can be greatly increased, and dosage of adhesive and an additive in the slurry can be further lowered.

Description

technical field [0001] The invention belongs to the field of lithium ion battery preparation, and in particular relates to a 3D foil material, a preparation method of positive and negative electrode sheets containing the foil material and an application thereof. Background technique [0002] With the continuous development of lithium battery technology and the continuous improvement of customers' requirements for lithium batteries, lithium-ion batteries are developing in the direction of lighter, thinner and higher capacity. Since the appearance of 18650, it has reached a peak in the field of lithium-ion batteries. In order to adapt to the development of productivity and realize the full utilization of lithium-ion batteries in various fields, researchers in this field hope to break the original shackles from all aspects, so there are thin-film batteries, high-power batteries, special-shaped batteries, etc. [0003] In the past, traditional batteries used traditional copper ...

AI Technical Summary

Problems solved by technology

For traditional batteries, the substrate is made of foil with a flat surface. When coating the slurry on the surface of the substrate, in order to have good adhesion between the slurry and the substrate, it is required to add enough glue and auxiliary materials to the slurry. Additives for adhesive and foil bonding, even this will limit the coating thickness and coating amount of the slurry, which will affect the capacity of the battery, as well as the rate and cycle performance of the battery

Images