| http://www.w3.org/ns/prov#value | - The structures 40, 42 in this example are each in the form of a porous iron matrix, (although the matrix may be Ni, Cr, Co, Mn, or Cu or some other suitable electronically conductive material such as another transition metal or carbon) and each matrix, in the charged state of the cell, has FeCl2 dispersed throughout its porous interior, in fine particulate or thin layer form, together with a minor
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