There are many more factors at play here besides density (though that is one of the most important ones if not the most important one). Longevity, cycle time, fast charging, cost and so on are all important factors too.
There are already battery chemistries that are ahead on some of these but afaik there isn't a clear winner yet for a new chemistry, but if it comes I would expect Lithium to be at least one of the ingredients, it is just too tempting a material property wise for this application.
There are already battery chemistries that are ahead on some of these but afaik there isn't a clear winner yet for a new chemistry, but if it comes I would expect Lithium to be at least one of the ingredients, it is just too tempting a material property wise for this application.