| http://www.w3.org/ns/prov#value | - As the binder of the cathode, a mixture of polyimide (95V1001, trade name of Sony Chemical) (hereinafter called a "soluble polyimide) which was expressed by Chemical Formula 4, in which conversion to imide was completed and which was soluble in an organic solvent and the fluorine polymer was employed. ##STR5## where Ar1 and Ar2 are aryl and n is an integer not smaller than 1
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