| abstract |
Disclosed is a non-aqueous alkaline earth metal storage element that suppresses gas generation and suppresses capacity reduction in a high-load charge / discharge cycle. A positive electrode active material layer contains a specific amount of one or more compounds selected from three types including the following formulas (1) and (2). In the formulas (1) and (2), R1 is an alkylene group having 1 to 4 carbon atoms and a halogenated alkylene group having 1 to 4 carbon atoms, and X1 and X2 are each independently-(COO) n (where, n is 0 or 1.) and M1 and M2 are each an alkaline earth metal independently selected from Be, Mg, Ca, Sr, and Ba. [Selection figure] None |