Connections I can make between Energy and Qi

With just about every written documentation I've found on Qi, there is always the concept of Yin and Yang included within it.  In other words there is no Qi without Yin and Yang.  The way that I can describe Qi is that Qi is the dance or interplay between Yin and Yang.  It's the result of these polar opposites meeting and the resulting emanation is Qi.  Qi is is like energy in that it's in constant motion, it's the driver and mover of all things.  And just like how energy, speed and mass are connected in that you can't have one without the other,  Qi, cannot exist without Yin and Yang because they're connected and inseparable from each other.