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Why are lithium batteries using CNTs more efficient than normal lithium batteries using graphite?

Why are lithium batteries using CNTs more efficient than normal lithium batteries using graphite? Correct Answer Store a lithium ion for every three carbon atoms

Lithium batteries generally make use of graphite electrodes in its system. If these are replaced by carbon nanotube electrodes, these can last even longer. The use of SWCNT as electrodes can also double the storage capacity. Several studies have shown that they are capable of storing a lithium ion for every 3 C-atoms compared to graphite that stores one for every six carbon atoms.

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