Battery technology development is a huge field with a long record of failed promises (often related to issues like lifetime, flammability, manufacturing cost, etc.).

One interesting recent development is the replacement of the cobalt needed in lithium batteries with iron. Cobalt wars in Africa's Congo are a current issue:

https://nextmoneyng.com/2021/12/22/the-cobalt-war-the-sino-a...

Now it seems that cobalt can be replaced with iron with no efficieny/storage capacity losses:

https://crm.org/articles/a-clean-industry-revolution-the-lit...

Lithium itself doesn't really seem replaceable for where it's used, in applications that demand relatively high energy density and voltage.