▎ 摘　　要

NOVELTY - Negative pole piece, comprises negative current collector, cathode active material layer containing cathode active material particles disposed on at least one side of cathode current collector, cathode active material layer includes surface layer with ID1/IG1 value of A. where, A = 0.55-0.78, ID1 is peak intensity of scattering peak at Raman shift of Raman spectrum of cathode active material in surface layer at 1328-1359/cm, IG1 is peak intensity of scattering peak at Raman shift of Raman spectrum of negative active material in surface layer at 1578-1585/cm, matrix layer with ID2/IG2 value B, matrix layer is located between cathode current collector and surface layer, ID2 is peak intensity of scattering peak at Raman shift of Raman spectrum of cathode active material in base layer at 1328-1359/cm, IG2 is peak intensity of scattering peak at Raman shift of Raman spectrum of cathode active material in base layer at 1578-1585/cm, cathode active material layer satisfies, A/B = 0.60-1. USE - The Negative pole piece is useful in secondary battery and electrical device (all claimed). DETAILED DESCRIPTION - INDEPENDENT CLAIMS are also included for: econdary battery, comprising the cathode sheet; and electrical device comprising the secondary battery. DESCRIPTION OF DRAWING(S) - The drawing shows a schematic diagram of an embodiment of the negative pole sheet. 1Minimum range values 10Cathode pole piece 11Cathode current collector