Graphite is formed from Covalent bond , it means it has no ions .
So how graphite can conduct electricity??

Dear Student
Graphite has a giant covalent structure in which: each carbon atom is joined to three other carbon atoms by covalent bonds. each carbon atom has one non-bonded outer electron, which becomes delocalised.
Graphite has delocalised electrons, just like metals. These electrons are free to move between the layers in graphite, so graphite can conduct electricity.

Regards