| 摘要 |
A negative electrode active material for a lithium-ion secondary cell, comprising: (A) a flaked graphitic carbon material in which the IG/ID(G value) is 5.2-100 and the aspect ratio and the area of the optical structure satisfy the relationships 1.5≤AOP≤6 and 0.2×D50≤(SOP×AOP)1/2<2×D50 for a 50% diameter D50[μm]; a composite material (B) obtained by dispersing silicon-containing particles (b2) having an oxygen content of 1-18% by mass and a surface layer comprising SiOx (0<x≤2) in an assembly of carbon nanotubes (b1) having an aspect ratio of 100-1000, at least 90% of the silicon-containing particles (b2) (expressed in terms of quantity) having a primary particle diameter of 200 nm or less; and a carbonaceous carbon material (C) covering at least some of the surface of the silicon-containing particles (b2). |
