The Animated Documentary is a cross-genre/sub-genre that has been around since Windsor McCay’s The Sinking of the Lusitania in 1918 (see embed below). It, along with direct cinema style animation, is a rich and informative form of animation worth a look.
This is the film Why Build a Sun on Earth? from Nik Morris. It is An animated documentary Nik made in collaboration with fusion scientists at York Plasma institute.
Windsor McCay’s The Sinking of the Lusitania
Waltz with Bashir – Another fairly recent example is the film Waltz with Bashir. Here’s the trailer: