A battery

Abstract

The application relates to the technical field of batteries, in particular to a battery, which comprises a negative electrode sheet and an electrolyte, the negative electrode sheet comprises a negative electrode current collector and a negative electrode active layer located on at least one side surface of the negative electrode current collector, the negative electrode active layer contains a silicon-based material and a binder; the binder contains polyurethane polyacrylate, the polyurethane polyacrylate is formed after polyurethane polyacrylate emulsion is dried to remove moisture, the polyurethane polyacrylate comprises a polyurethane unit and a polyacrylate unit; the electrolyte contains 1,3-propane sulfone lactone, and the mass content of the 1,3-propane sulfone lactone in the electrolyte is 0.5wt%-5wt%. The composition of the negative electrode binder of the battery is improved, so that the negative electrode binder can better adapt to the volume change of the silicon-based material, and the specific electrolyte additive is matched, which is beneficial to the improvement of the cycle performance of the battery.

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