Filling material and preparation method thereof, negative electrode sheet, battery and preparation method thereof

Abstract

The application discloses a filling material and a preparation method thereof, a negative electrode sheet, a battery and a preparation method thereof. The filling material is used for the negative electrode sheet. The filling material comprises a shell layer and a core. The shell layer wraps the core. The core comprises vinylene carbonate. The shell layer comprises polyurethane acrylate. The shell layer is a cross-linked structure. After the shell layer of the filling material is broken by heating, the vinylene carbonate of the core can be dissolved by an electrolyte, and then a pore is formed in the negative electrode sheet. The diffusion path of lithium ions can be shortened, the kinetic performance of the negative electrode sheet is improved, the volume energy density of an energy storage system and the battery is improved, and the vinylene carbonate can be released in situ and concentrated around the negative active material particles. A high-quality SEI film which is more compact, more uniform and richer in LiF is formed during the first formation.

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