A kind of high tortuosity lithium-ion battery thin film and preparation method thereof

Abstract

The invention discloses a lithium-ion battery film with high tortuosity and a preparation method thereof. The battery film is made of the following raw materials by weight percentage, porogen 67%-74%, ultra-high molecular weight polyethylene 25%-30 %, polycarbonate 0.1%‑0.2%, random copolymer polypropylene 0.1%‑2%, chlorinated polyethylene 0.1%‑0.2%, polymethyl methacrylate 0.1%‑0.2%, dispersant 0.1%‑0.2 %, reinforcing fiber 0.1%-0.2%, colloidal silicon dioxide 0.1%-0.2%, compatibilizer 0.1%-0.2%, cross-linking agent 0.1%-0.2%, the dispersant consists of polyvinylpyrrolidone and methylnaphthalene production. In the present invention, when mixing ultra-high molecular weight polyethylene and white oil, polycarbonate, random copolymerized polypropylene, chlorinated polyethylene, polymethylmethacrylate, polyvinylpyrrolidone, reinforcing fiber, and colloidal silicon dioxide are added at the same time. , compatibilizer, and crosslinking agent are mixed, and then stretched longitudinally and transversely to finally obtain the effect of a lithium battery separator with obvious crosslinking, complex three-dimensional space structure, and high tortuous pore structure.

Description

A kind of high tortuosity lithium ion battery film and preparation method thereof technical field The present invention relates to the technical field of lithium batteries, in particular to a high tortuosity lithium ion battery film and a preparation method thereof Law. Background technique [0002] The lithium ion battery is composed of four parts: positive electrode material, negative electrode material, separator and electrolyte. where the separator is lithium An important part of the battery, it plays the role of separating the positive and negative electrodes of the battery to prevent short circuit due to contact between the two poles. It also has the function of allowing electrolyte ions to freely pass between the positive and negative electrodes, and when the battery is overheated, it can pass through the "closed cell function". "Energy" to prevent the current conduction in the battery. The micropores of the separator are too small, and the pores of the separat...

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Problems solved by technology

If the tortuosity of the micropores of the diaphragm is too small, the pores of the diaphragm will be close to the ideal parallel net column channel, the puncture strength of the diaphragm will be greatly reduced, and the risk of short circuit due to positive and negative contact will be increased. It is difficult to fuse and close, which reduces the safety performance of lithium batteries. Therefore, it is particularly important to invent a high-tortuosity lithium-ion battery film and its preparation method

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