| abstract |
The present invention relates to a negative electrode composite material for an all-solid lithium ion secondary battery and a method for producing the same. The negative electrode compound material for the all-solid-state lithium ion secondary battery has a negative electrode active material containing Si, and can suppress an increase in internal resistance in the all-solid-state lithium ion secondary battery. A negative electrode composite material, which is a negative electrode composite material for an all-solid lithium ion secondary battery, characterized in that the negative electrode composite material contains a negative electrode active material (A), a solid electrolyte (B), a conductive material (C) and a bonding agent agent (D), the negative electrode active material (A) contains Si, the solid electrolyte (B) contains a sulfide solid electrolyte, the conductive material (C) contains a fibrous carbon material having a carbon six-membered ring, the The binder (D) contains a polymer compound having an aromatic ring. |