even if Aokiji were to fight him at close range Enel would still have some advantage.
Aokiji took down the M3 with ease, and he has better combat feats than Enel. On top of that Enel doesn't have CoA while Aokiji does, so a close combat scenario would spell death for Enel.
His best bet is to use his lightning teleportation, stay at a distance and pin point Aokiji with CoO. From then on it's all about landing El thors.