Preparation method and application of porous polyolefin composite membrane

• Main Authors: ZHANG XIAOLEI, LONG XIANGYU, WANG CHAOJUN, HAO FURUI, WANG ZHONGWEI, KONG XIANGHAI, WANG PAN, FAN WEI, YANG LICAN
• Format: Patent
• Language: Chinese; English
• Published: 15.11.2022
• Subjects: BASIC ELECTRIC ELEMENTS; ELECTRICITY; PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSIONOF CHEMICAL INTO ELECTRICAL ENERGY

The invention belongs to the technical field of microporous composite membranes, and particularly relates to a preparation method and application of a porous polyolefin composite membrane.Polyolefin is subjected to fiber modification in advance to enhance the mechanical property of the polyolefin, and a high-porosity base membrane is prepared by increasing the draw ratio; then the solid electrolyte material is subjected to mixed acid pretreatment and secondary ultrasonic dispersion, impurities on the surface of the solid electrolyte are eliminated, more active functional groups are provided, the complexing effect of the solid electrolyte with a solvent, an organic polymer and a polyolefin-based membrane is enhanced, the dispersity of the solid electrolyte is greatly improved, and the use amount of the solvent is reduced; in this way, the Li < + > transmission performance in the composite solid polymer electrolyte is improved, and the obtained porous polyolefin composite membrane product serves as a lithium ba