Solar panel costs are falling rapidly every month as more and more companies join the production race.....plus the technology is getting better at harvesting the energy ie the panels themselves become more efficient......Germany is the 2nd biggest producer of Solar Energy, despite getting the same amount of sun as Alaska.....as more and more EVs are produced, more solar roofs are installed and more and more Powerwalls installed, then the World storage of electricity will become greater.....plus we are only at the very start of battery technology, there are extremely exciting developments being made in the field of Graphene and salt-water batteries.
Lithium itself is usually mined from poorer countries like Peru and Bolivia who would love the spare cash....plus it is basically a waste product from desert areas where nothing grows anyway....no idea on disposal, but I guess it will have a recycling value
https://www.youtube.com/watch?v=50rXYrFCQMw
ps - On one of the gardening Youtube guys I follow, his motto is "changing the World, one garden at a time".......maybe the Solar motto should be "Changing the World, one rooftop at a time"