Despite its excellent stability in water and organic electrolytes, the Cu-triazole MOF is well soluble in aqueous acids, e.g. HCl, H 2 SO 4 , HNO 3 , so that the degradation on demand may be possible for its safe disposal provided that copper is an essential trace mineral. This makes the Cu-triazole MOF environmentally safe and recyclable. Our halogen-ion battery is non-flammable, moisture resistant, and all elements used are abundant, hence it can find a niche in the battery market.