[PapaBear3625]

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)

[TXnMA]

17.5 X Coal energy cost -- forget it!

Bingo! The answer as to why this will remain a laboratory curiosity -- at least as far as disposal of CO₂ is concerned.

IF somone develops a semiconductor process/product based on the reaction product, a few Kg of CO₂ might be sequestered by it. Qtherwise, it is a mere curiosity...

Of course, let me be the first to point out that there is ZERO need to "sequester" atmospheric CO₂ in the first place...