A silicon-based negative electrode binder, a preparation method thereof, a negative electrode slurry, a negative electrode sheet, and a secondary battery

Abstract

The application discloses a silicon-based negative electrode binder and a preparation method thereof, a negative electrode slurry, a negative electrode sheet and a secondary battery, and belongs to the technical field of lithium ion batteries. The silicon-based negative electrode binder is 5-(1,2-dithiolane-3-yl) phenyl valerate, which is obtained by esterification reaction of thioctic acid and phenol in the presence of a catalyst. The silicon-based negative electrode binder provided by the application exists in the form of a small molecule in the slurry, is not prone to molecular chain rupture in the high-speed dispersion process, is beneficial to uniform dispersion of active materials and conductive agents, and can construct a dynamic cross-linking network in situ during electrode preparation and circulation, effectively buffers the volume expansion and shrinkage stress of silicon materials by using the self-healing characteristics, and significantly improves the structural stability and cycle life of the electrode.

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