The night time surplus is big enough to electrify a pretty good chunk of the fleet, and even at 100% electrified you still wouldn't push night time loads up to daytime peaks. 

From a logistic perspective, lithium is very recoverable. The supply chain is not developed yet, but it will be when it comes to that.  Mining isn't any more harmful than any other hard-rock mining although most current lithium is extracted from salt-lakes right now, which is pretty ecologically innocent -