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Ni 99.9% Pure Nickel N6 200 201 Strip Ribbon for 21700 18650 Power Battery 1). Chemical composition(%) Grade Ni+Co Cu Si Mn C Mg S P Fe N4 99.9 0.015 0.03 0.002 0.01 0.01 0.001 0.001 0.04 N6 99.6 0.1 ...