Kakashi doesn't have fire element, that's anime only, non-cannon.
^That guy has it right.
Kakashi does not have the element of fire at his disposal.
http://naruto.wikia.com/wiki/Kakashi_Hatake
In part one it was used against Kisame, I believe he copied the water missile jutsu.
In part two I cannot remember any copying done by Kakashi and I don't know if he's had a chance against the enemies he's been fighting besides edo seven swords men that was off-screen. There just hasn't been...