| abstract |
To provide: positive electrode active material/graphene composite particles, which are for a positive electrode active material of a lithium ion battery having low electron conductivity, and with which electron conductivity is improved while suppressing hindrance of lithium ion extraction/insertion into active material particles; and a positive electrode material for a lithium ion battery, said positive electrode material comprising said composite particles. [Solution] The present invention provides: positive electrode active material/graphene composite particles; and a composite particle-like positive electrode material which is used in a lithium ion battery, and which is obtained by combining, with a matrix including graphene, positive electrode active material particles, said positive electrode material wherein, a value obtained by dividing the proportion of carbon (%) in a material surface measured by way of an X-ray photoelectron measurement, by the proportion of carbon (%) in the whole material, is in the range 1.5 to 7 inclusive. |