Re: post 12 - every “LiN3” should = “Li3N”.
Damned chemical dyslexia!
By the way, Li3N will be very water sensitive, so much so that I expect it will react spontaneously with moisture in the atmosphere, which will further complicate any real use of this system.
A bigger complication: you get Li3N by exposing Li to nitrogen. Refining lithium, however, consumes 35 kWh/kg. In comparison, burning one kg of coal produces just 2 kWh of heat energy (and much less than that in actual electrical output)