Porous lithium-ion battery separator based on cross-linked and linear polymers and its preparation method and application

Abstract

The invention discloses a porous lithium-ion battery separator based on cross-linked and linear polymers, a preparation method and application thereof. The specific preparation method is: mix polyvinylidene fluoride-hexafluoropropylene, (meth)acrylate monomer, octavinyl polyhedral oligomerized silsesquioxane crosslinking agent and nano-oxidizing agent in a suitable solvent, and Free radical polymerization forms a gel polymer film with a cross-linked structure, and after the porogenic effect of nano-zinc oxide, its ionic conductivity reaches 1.4×10 at 25°C. ‑3 S / cm, the tensile strength reaches 16 MPa, and has excellent dimensional stability. The lithium-ion battery diaphragm obtained by the invention can greatly improve the ion conductivity, and also significantly improve the high-rate charge and discharge performance, and has good application potential.

Description

technical field

[0001] The invention belongs to the technical field of battery separator materials, in particular to a preparation method and application of a porous lithium-ion battery separator based on cross-linked and linear polymers. Background technique

[0002] Lithium-ion battery is a lithium-ion (Li + ) is a rechargeable and dischargeable battery that works by intercalating and deintercalating in positive and negative electrode materials. It is generally composed of five parts: positive electrode, negative electrode, separator, electrolyte and battery casing. Compared with traditional batteries, lithium-ion batteries have a relatively With the advantages of high energy, high battery voltage, wide operating temperature range, and no memory effect, it is widely used in mobile phones, laptop computers, and electric vehicles. As one of the most critical internal components in lithium-ion batteries, the separator has two functions: carrying electrolyte, transporting ele...

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