▎ 摘　　要

NOVELTY - Negative electrode material comprises composite film containing multiple holes alternately deposited by a silicon-based film, and a carbon film. The ratio of the monolayer thickness of the silicon-based thin film to the monolayer thickness of the carbon thin film is A. The ratio of the total thickness of the composite film to the average pore diameter of the pores is B, where A=1-10, B=2-10. USE - Negative electrode material used in negative pole piece, electrochemical device, and electronic device (all claimed). ADVANTAGE - The negative electrode material has improved structural stability of the silicon-based anode, improved cycle performance, and reduced expansion rate. DETAILED DESCRIPTION - INDEPENDENT CLAIMS are included for: 1. a negative pole piece, which comprises: a current collector (14), and an active material layer on at least one surface of the current collector, where the active material layer includes the negative electrode material; and 2. an electrochemical device, which comprises: a positive pole piece, negative pole piece, and a separator arranged between the positive pole piece and the negative pole piece. DESCRIPTION OF DRAWING(S) - The drawing shows a cross-sectional view of the negative pole piece. 11Hole of the composite film 12Carbon film 13Silicon-based film 14Current collector