| http://www.w3.org/ns/prov#value | - Among these electroactive substances, metal oxides such as cobalt oxide, manganese oxide, vanadium oxide, nickel oxide, and molybdenum oxide; metal sulfides such as molybdenum sulfide, titanium sulfide, and vanadium sulfide, are preferred in view of their higher packing density and higher volumetric capacity in such an electroactive substance, and particularly preferred are manganese oxide, nickel
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