Sea-island polyphenylene sulfide superfine fiber paper-based battery diaphragm and preparation method thereof

Abstract

The invention belongs to the technical field of battery diaphragm manufacturing, and discloses a sea-island polyphenylene sulfide superfine fiber paper-based battery diaphragm and a preparation method thereof. The method comprises the steps that polyphenylene sulfide A and polyphenylene sulfide B are blended and granulated and then subjected to melt spinning with an alkali-soluble polyester, and sea-island polyphenylene sulfide composite fibers are obtained; and the sea-island polyphenylene sulfide composite fibers are cut short after heat treatment, and the sea-island polyphenylene sulfide superfine fiber paper-based battery diaphragm is obtained through dispersion pulping, defibering, papermaking and hot pressing. The preparation process is simple and convenient, an organic solvent is not needed, the preparation method is suitable for large-scale production, the electrolyte absorbency of the battery diaphragm is improved, and the prepared sea-island polyphenylene sulfide superfine fiber paper-based battery diaphragm has good thermal stability, chemical stability, mechanical performance, flame retardance and the like. The preparation method disclosed by the invention is suitable for preparing the sea-island polyphenylene sulfide superfine fiber paper-based battery diaphragm, and the prepared sea-island polyphenylene sulfide superfine fiber paper-based battery diaphragm is suitable for a lithium battery.

Description

technical field [0001] The invention belongs to the technical field of battery diaphragm manufacture, and relates to polyphenylene sulfide superfine fibers, in particular to a sea-island type polyphenylene sulfide superfine fiber paper-based battery diaphragm and a preparation method thereof. Background technique [0002] Today, when the energy crisis and the global warming effect are getting worse, it is urgent to develop clean and green sustainable energy storage and conversion devices. Lithium batteries have the advantages of high working voltage, high specific energy, long cycle life, and no environmental pollution. As a secondary chemical power source that can convert electrical energy and chemical energy into each other, it has always been regarded as a hot spot in power storage systems by people in the industrial field. technology. Lithium-ion batteries are mainly composed of positive and negative electrode materials, electrolyte and diaphragm, in which the diaphragm...

AI Technical Summary

Problems solved by technology

The PPS non-woven fabric substrate prepared by the melt-blown method forms a three-dimensional fiber network structure through entangled fibers. This structure provides high porosity for the lithium-ion battery separator, but the fibers prepared by the melt-blown method have low strength, Diaphragm pore size is large and unevenly distributed

The invention patent of Chinese Patent No. CN112054146A discloses "a method for producing battery separators made of PPS materials and the film made thereof". The preparation method in this patent is to add PPS materials in a weight ratio of 1%-70% into PP and PE, and then produce a film filled with PPS material with rich nano-scale pores according to the PE film-forming process through steps such as extrusion, stretching, and extension. However, this method is complicated in process, technically difficult, and not suitable for mass production

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