Lithium hydroxide and lithium peroxide are used in confined areas, such as aboard spacecraft and submarines, for air purification. Lithium hydroxide absorbs carbon dioxide from the air by reacting with it to form lithium carbonate, and is preferred over other alkaline hydroxides for its low weight. Lithium peroxide (Li2O2) in presence of moisture not only absorbs carbon dioxide to form lithium carbonate, but also releases oxygen. For example 2 Li2O2 + 2 CO2 → 2 Li2CO3 + O2.
This could be used to as a non electrical oxygen producer. Say an electrical storm came we could switch over to this system.
http://en.wikipedia.org/wiki/Lithium