Wet-process nanometer fiber lithium ion battery separator and preparation method thereof

• Main Authors: QIAN SHUANG, FAN HAIPING, ZHAO HAIYU
• Format: Patent
• Language: Chinese; English
• Published: 26.04.2017
• Subjects: BASIC ELECTRIC ELEMENTS; ELECTRICITY; MANUFACTURE OR TREATMENT OF NANOSTRUCTURES; MEASUREMENT OR ANALYSIS OF NANOSTRUCTURES; NANOTECHNOLOGY; PERFORMING OPERATIONS; PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSIONOF CHEMICAL INTO ELECTRICAL ENERGY; SPECIFIC USES OR APPLICATIONS OF NANOSTRUCTURES; TRANSPORTING

The invention discloses a wet-process nanometer fiber lithium ion battery separator. The wet-process nanometer fiber lithium ion battery separator is a double-sided ceramic coating film. The preparation is achieved based on a thermally induced phase separation method and comprises the steps of mixing and extruding nanometer fibers and ultra-high molecular weight polyethylene according to a certain proportion, bidirectionally stretching a substrate, performing extraction and heat setting to obtain a substrate film, and finally performing double-sided coating to obtain the lithium ion battery separator. The nanometer fibers mixed in the substrate film have a support effect on a pore passage, meanwhile, a part of nanometer fibers are exposed out of a film surface, thus, the roughness is improved, and a coating layer is more firm to combine by coating on such substrate film. The lithium ion battery separator prepared by the method has the advantages of high porosity, high thermal stability and stable coating cohe