We abbreviate it as Reef. Lithium-ion-encapsulating fullerenes are fullerenes around them, and one lithium ion inside. The way to make it is to drive lithium ions into fullerenes. It is an allotrope made up of 60 pieces of carbon, and is formed by connecting the hexagonal part and the pentagonal six-membered ring and five-membered ring, forming a round shape like a soccer ball.