High-strength and high-elongation lithium battery diaphragm and preparation method thereof

The invention belongs to the technical field of lithium battery diaphragms, and particularly relates to a high-strength and high-elongation lithium battery diaphragm and a preparation method thereof.The high-strength and high-elongation lithium battery diaphragm is prepared from the following raw materials: polyethylene, ethylene vinyl acetate containing flexible chain macromolecules, an auxiliary agent, an antioxidant and a plasticizer. According to the flexible chain macromolecules, ethylene vinyl acetate containing the flexible chain macromolecules is added into raw materials and mixed with the components such as polyethylene, the auxiliary agent, the antioxidant and the plasticizer for use, so that the melt processability of polyethylene is improved to a certain extent, and the condition of similar brittle fracture of the lithium battery diaphragm is improved. 本发明属于锂电池隔膜技术领域，具体涉及一种高强度高延伸的锂电池隔膜及其制备方法。本高强度高延伸的锂电池隔膜包括以下原料：聚乙烯、含有柔性链高分子的乙烯醋酸乙烯酯、助剂、抗氧化剂和增塑剂；其中所述柔性链高分子包括：通过在原料中加入含有柔性链高分子的乙烯醋酸乙烯酯，与聚乙烯、助剂、抗氧化剂、增塑剂