PVDF-BP microporous polymer diaphragm and preparation method

Abstract

The invention discloses a PVDF-BP microporous polymer diaphragm and a preparation method. The PVDF-BP microporous polymer diaphragm comprises the following components in parts by weight: 35-50 parts of PVDF polyvinylidene fluoride, 50-65 parts of BP benzophenone and 0-5 parts of auxiliaries. The preparation method for the PVDF-BP microporous polymer diaphragm comprises the specific following stepsof 1, stirring; 2, dissolving and extruding; 3, cooling and forming; 4, stretching; 5, extracting; 6, shaping; 7, rolling, and 8, storing. The PVDF-BP microporous polymer diaphragm disclosed in the invention has the advantages of high puncture strength, high high-temperature resistance, uniform pore diameter distribution, high air permeability, excellent electrochemical resistance, and high electrolyte absorptivity; and the preparation method is simple in method, green and environment friendly, and high in production efficiency.

Description

technical field

[0001] The invention relates to a PVDF-BP microporous polymer diaphragm and a preparation method. Background technique

[0002] As a key component of the battery, the separator will directly affect the capacity, cycle performance and safety performance of the battery. In recent years, the porous polymer system has attracted widespread attention. In 1994, the US Bellcore company used polyvinylidene fluoride-hexafluoropropylene (PVDF-HFP) to prepare a microporous polymer membrane through a plasticization / extraction process, increasing However, PVDF-HFP-based polymer separators have disadvantages such as low ion transfer number, poor thermal stability, poor gas permeability, poor electrochemical resistance, and poor interfacial compatibility. Contents of the invention

[0003] The purpose of the invention is to overcome the deficiencies in the existing products, and provide a PVDF-BP microporous polymer membrane and a preparation method.

[0004] In order to...