There are issues with copper to aluminum (or aluminum to copper) connections as part of conducting an electric current.
In household wiring, when such connections are done without using special connectors, the aluminum wire (some old houses still have aluminum wires) can heat up.
I think the properties that make aluminum a candidate for batteries, may also present issues that will have to be addressed before aluminum batteries can move from an idea to production.
Don’t use the cheap Harbor jumper cables to wire your trolling motor. The aluminum wiring they’re made from, in a marine environment, will leave you without the use of your trolling motor in less than a year. Ask me how I know...
Had a house fire a few years back, owner had some illegals install a skylight, and the mixed copper and AL incorrectly
Dissimilar metals oxidize when joined together. Aluminum and copper have different thermal expansion and contraction properties which make cracks possible.
They pretty much eliminated aluminum wiring in us codes for houses.
See my comment #83, posted before I read the thread.