I just wanted to make it clear that its a long “e”, but pretty much the same word as “animation”, not the correct english spelling of an english-imported word :p
What I've seen most is the line put above the vowel, resulting in animē (but difficult to type). As there is no additional (fourth) syllable, a-ni-mee would be more logical to me, rather than a-ni-me-ee or a-ni-me-e.
That being said, I like how the triple vowel makes it clear it's not the same sound as in say meet. (This gives me the idea to change my name to tuuukkkah...)