Interface modification method of silicon-carbon negative electrode sheet and silicon-carbon negative electrode sheet with interface modification

Abstract

The application relates to an interface modification method of a silicon-carbon negative electrode sheet and an interface-modified silicon-carbon negative electrode sheet, and the method comprises the following steps: depositing a nitrogen-rich polymer ink on the surface of a silicon-carbon negative electrode sheet through a 3D printing technology to form a polymer microzone; and performing limited heat treatment on the polymer microzone through a laser to induce the polymer microzone to react with the surface of the silicon-carbon negative electrode sheet, form a chemical bonding reinforced network layer, and obtain the interface-modified silicon-carbon negative electrode sheet. The application can solve the problems that, in the related art, the silicon expands in volume during charging and discharging, the electrode structure is damaged and the interface is layered, and the particles are prone to peeling and electrical contact failure after long cycle.

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