Composite of silicon or silicon oxide and carbon nanohorn aggregate for electrode material of lithium ion secondary battery and silicon or silicon oxide and carbon nanohorn aggregate for electrode material of lithium ion secondary battery and lithium ion secondary battery A method for producing a complex with a body.

摘要

PROBLEM TO BE SOLVED: To provide a composite body of silicon or a silicon oxide and a carbon nanohorn, in which volume change due to insertion and desorption of lithium ions can be relieved, and a method for producing the composite body.SOLUTION: A composite body 10 of silicon or a silicon oxide and a carbon nanohorn includes: a carbon nanohorn aggregate 21 having an opening 211; and silicon or a silicon oxide 31 involved in the carbon nanohorn aggregate 21.