Is it ALL metals, or just steel?
I designed a machine once that manufactured Polaroid film packages. It included a corrosive paste that would dissolve stainless steel overnight. We used several different kinds of plastic and titanium fasteners. But we got the most use from aluminum with a special coating on it. Frankly I can't remember what it was right now. That was 15 or 20 years ago. I'm sure there are some better coatings available now. In my current position we recently used aluminum coated with Magnaplate HCR with good results for a certain application. It wasn't lithium, but its just an example of the wide variety of coatings available today. You might look into it.