Conductive composite waterborne adhesive as well as one-pot preparation method and application thereof

Abstract

The invention discloses a conductive composite waterborne adhesive as well as a one-pot preparation method and application thereof. A conductive composite waterborne adhesive material is prepared by adopting a one-pot method by simultaneously initiating grafting polymerization between double bond-containing grafting monomers and hydroxyl-containing waterborne polymers and chemical oxidative polymerization of conductive polymer monomers by adopting the same polymerization initiator, wherein the double bond-containing grafting monomers and the hydroxyl-containing waterborne polymers perform grafting polymerization reaction, and simultaneously, the conductive polymer monomers perform chemical oxidative polymerization; the conductive composite waterborne adhesive prepared by the invention hasgood dispersity, film forming property and chemical stability, can be dispersed in an aqueous solution for a long time in the form of colloid, does not settle, exists stably, has excellent electronicconductivity, solves the problem about dispersity of an adhesive and conductive particles in an electrode slurry preparation process, realizes uniform distribution of various components in an electrode, and ensures high-efficiency electron and ion transportation in the electrode.

Description

Technical field: [0001] The invention relates to the technical field of conductive polymer materials, in particular to a conductive composite water-based binder and a one-pot preparation method and application thereof. Background technique: [0002] In the traditional battery manufacturing process, it is necessary to use binders to adhere powder electrode active materials and conductive particles to the current collector to form a conductive network as a whole. As an important inactive component of lithium-ion batteries, the binder adheres electrode active materials and conductive agents to the current collector, and its performance directly affects the electrochemical performance of the battery. The conductive particle additive is used to improve the electronic connection between the electrode sheet particles and the particles, which can improve the overall electronic conductivity of the electrode sheet, facilitate the conduction of electrons and ions in the process of char...

AI Technical Summary

Problems solved by technology

However, because PVDF has its own shortcomings, such as poor electronic and ionic conductivity, and certain swelling in the electrolyte, it cannot guarantee efficient electron transfer in the electrode.

In addition, for electrode materials (such as Si-based materials) that undergo drastic volume changes during charge and discharge, conductive particles (carbon black, Super P) are easily squeezed out and lose effective electronic contact, thus creating a gap between particles in the electrode. Reduced conductive connection

The physical connection between the binder and the conductive particles after stirring and mixing is easy to be destroyed during the charge and discharge process of the electrode material, resulting in the collapse of the electrode conductive network structure and the decline in battery performance, etc.

Moreover, the use of a large amount of binder and conductive particles (inactive components) in the process of preparing electrode sheets will reduce the energy density and volume density of the entire battery, which is not conducive to its actual commercial application and the development of the new energy industry for electric vehicles in the future.

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