Binder for lithium secondary batteries, and electrodes and lithium secondary batteries containing the same

PVdF-Reduced Binder Using Vinyl-Based Ionic Liquid and N-Vinylacetamide Cross-Linked Network

This technology utilizes a polymer network formed by polymerizing and cross-linking a vinyl-functionalized ionic liquid with N-vinylacetamide as a binder for lithium secondary batteries.

Conventional PVdF binders pose significant environmental and health risks and are costly. Furthermore, they suffer from electrode structural instability and low coulombic efficiency over repeated charge-discharge cycles.

This technology mixes an ionic liquid and N-vinylacetamide with an initiator, optionally combined with PVdF, to form a robust cross-linked network within the electrode, thereby enhancing adhesion, high-temperature thermal stability, and coulombic efficiency. It can be applied to electrode coating processes using NCM-based cathode slurries, supporting a transition toward reduced fluorine-based binder usage to lower production costs and improve workplace safety.

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Key Features:

• Ionic liquid where R is C2-C13 alkyl, allyl, or butenyl, and the anion is selected from BF4-, PF6-, TFSI, etc.
• Binder for lithium secondary batteries comprising an ionic liquid represented by Chemical Formula 1 and N-vinylacetamide
• Polymerization initiator selected from AIBN, BPO, cumyl peroxide, etc., additionally included in the binder
• Fluorine-containing polymer further included in the binder, such as PVdF, PVdF-HFP, PVdF-TFE, or combinations thereof

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