Mosaic-type nano film

Abstract

The invention discloses a mosaic-type nano film which consists of nano film layers, wherein each nano film layer consists of mutually parallel nano film units; a gap exits between the adjacent nano film units; each nano film unit is formed by alternately arranging at least three first nano fibers and at least three second nano fibers; each first nano fiber is formed by mixing a styrene-series cation exchange resin, an adhesive and a cross-linking agent at a mass ratio of 1:(4-9):(1-10); each second nano fiber is formed by mixing a vinylpyridine-series anion exchange resin, the adhesive and the cross-linking agent at a mass ratio of 1:(4-9):(1-10). The nano film has the favorable performances of high porosity, low bore diameter, favorable wettability, strong ionic conductivity and high mechanical strength.

Description

technical field [0001] The invention relates to a polymer nano film, in particular to a mosaic nano film. Background technique [0002] Electrospinning technology is a new type of fiber preparation technology that has emerged in recent years. This technology uses polymer solution to be polarized under the action of a high-voltage electric field, and driven by the force of the electric field, it overcomes the shackles of the surface tension of the solution to form a Taylor cone. , ejected from the nozzle to form a jet, the jet moves in the electric field, continuously splits, refines, solidifies through solvent volatilization, and finally forms a fiber non-woven fabric, but by changing the receiving device, you can get oriented fibers, and then get a regular multi-dimensional structure of the nano-membrane. The nanomembrane prepared by electrospinning has the characteristics of small fiber diameter (about 200-1000nm), large specific surface area, high porosity (porosity can ...

AI Technical Summary

Problems solved by technology

[0004] At present, the commercially available porous membranes mainly have the following disadvantages: First, the porosity is often at the expense of the strength of the material. For example, the porosity of the commercially available porous membranes reaches 60% or above, so the pursuit of smaller membrane volume is the opposite of the porous membrane. A challenge, because the diaphragm must be made thin, but it must be able to maintain the original capacitance, recyclability and safety performance, etc.

Thirdly, although the pore size of a few microns has the advantages of melting and closing at high temperature, cutting off the circuit, and protecting the battery, it increases the difficulty of the electrolyte wetting the material and is not conducive to reducing the interface resistance. Therefore, surface treatment of the separator is an indispensable process.

Finally, ordinary porous separators cannot prevent current overload. For safety, for example, in the production of battery separators, PPCT self-recovery overcurrent protection sheets must be built in for protection.

All these disadvantages complicate the diaphragm production process and make it difficult to reduce the cost

Images