^ That's an interesting take, however my interpretation is a bit simpler. The Chitauri died because they were using life support for an alien enviroment (Earth) that was centrally powered. When they lost connection with the base they suffocated.
I'm not sure there has ever been a full explanation for how Vibranium actually works, but it's implied by the name; it vibrates. Like noise cancellation, the Vibranium returns incoming force, cancelling it. I've never gotten the impression it stores any form of energy.