Preparation method of organic pre-lithiated diaphragm material

• Main Authors: LAN TIANXI, TAO QIONGCHENG, TANG JIAOJUN, HUANG XIAOWEI, ZHANG XIAOGANG, TAN LIYI, WEN JUAN, LIU JIAQI, LUO YANG, ZHUO JIAXIN
• Format: Patent
• Language: Chinese; English
• Published: 09.04.2024
• Subjects: BASIC ELECTRIC ELEMENTS; ELECTRICITY; PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSIONOF CHEMICAL INTO ELECTRICAL ENERGY

The invention provides a preparation method of an organic pre-lithiated diaphragm material, and relates to the technical field of new energy batteries, the preparation method comprises the following steps: S1, uniformly mixing Li2C4O4, polyvinylidene fluoride and a carbon source according to a certain proportion, then adding N-methyl-2-pyrrolidone (NMP) according to a certain solid content, and mixing; s2, then an extrusion type coating machine is used for evenly smearing one side of a PE diaphragm with the slurry through a die head, drying treatment is conducted in a vacuum drying oven, an anode SEI film fluoride coating layer becomes loose and porous, sufficient infiltration of electrolyte is facilitated, a stable SEI film can be formed by a negative electrode, and as the toughness of the diaphragm material is higher than that of a positive electrode piece, the service life of the diaphragm material is prolonged. Collapse of the material structure does not cause collapse and powder falling of the diaphragm