Pure silicon negative electrode and preparation method thereof, all-solid-state battery and electric equipment

The invention relates to the technical field of silicon negative electrodes, in particular to a pure silicon negative electrode, a preparation method of the pure silicon negative electrode, an all-solid-state battery and electric equipment. The pure silicon negative electrode comprises an active material layer, and the active material layer is mainly made of silicon elementary substance; and the median particle diameter D50 of the silicon elementary substance is 30-800nm. By optimizing the particle size of the silicon elementary substance, structural damage caused by volume expansion/shrinkage in the lithium intercalation/deintercalation process of the silicon negative electrode is greatly relieved, and a necessary carrier transport network in the silicon negative electrode is ensured, so that the capacity fading rate of the pure silicon negative electrode solid-state battery is relieved, stable long cycle performance is realized, and the service life of the pure silicon negative electrode solid-state battery