| http://www.w3.org/ns/prov#value | - As specific examples of the cathode material, in addition to an element belonging to Group 1 or 2 of the periodic table of the elements, that is, alkali metals such as Li and Cs and alkali-earth metals such as Mg, Ca, and Sr, and an alloy (Mg:Ag or Al:Li) and a compound (LiF, CsF, or CaF2) including the element, a transition metal including a rare-earth metal can be used to form the second electro
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