▎ 摘　　要

NOVELTY - Power storage device comprises a negative electrode and an active material layer. The negative electrode comprises a current collector. The active material layer comprises active material particles, a graphene compound, and a binder. Multiple spaces are present between one of the active material particles and the graphene compound. USE - Power storage device. ADVANTAGE - The power storage device has high capacity, high energy density, high reliability, and long-life storage. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for a method for manufacturing a negative electrode, which involves forming silicon particles, mixing a graphene compound, a binder, and the silicon particles, performing an etching treatment, and forming a slurry, where spaces are formed by the etching treatment. DESCRIPTION OF DRAWING(S) - The drawing shows a schematic cross-sectional view of the electrode. 121Negative electrode active materials 122Binder 123Graphene compounds 124, 125Spaces