05 Feb '18 13:13>7 edits
https://techxplore.com/news/2018-02-metal-oxide-magnesium-battery-high-density-energy.html
this isn't the magnesium-sulfur type of battery I believe will be the one that will pan out as the best one of choice in the long run (at least if flow-batteries do NOT pan out in the vary long run. See https://en.wikipedia.org/wiki/Flow_battery ) but, still, it is good because it should be both more energy dense and much cheaper than the lithium-ion batteries.
Also of some interest is this latest research into lithium-sulfur batteries;
https://techxplore.com/news/2017-12-graphene-lithium-sulfur-batteries.html
and the new lithium-iron-oxide battery;
https://techxplore.com/news/2018-01-battery-leverages-iron-oxygen-lithium.html
although I don't think lithium-based batteries will pan out in the very long run because lithium will be replaced with much cheaper plentiful metals (probably mainly if not entirely magnesium)
what makes me excited is that the battery technology is relentlessly improving all the time and now I am cautiously optimistic it wouldn't be very long now (well within my lifetime) before one type (and I bet it would be either magnesium-sulfur battery or a flow battery; don't know which) will be made so good as to provide ultra-cheap off-the-grid energy storage for renewable energy using only common cheap none-toxic recyclable materials and no rare-earth elements.
this isn't the magnesium-sulfur type of battery I believe will be the one that will pan out as the best one of choice in the long run (at least if flow-batteries do NOT pan out in the vary long run. See https://en.wikipedia.org/wiki/Flow_battery ) but, still, it is good because it should be both more energy dense and much cheaper than the lithium-ion batteries.
Also of some interest is this latest research into lithium-sulfur batteries;
https://techxplore.com/news/2017-12-graphene-lithium-sulfur-batteries.html
and the new lithium-iron-oxide battery;
https://techxplore.com/news/2018-01-battery-leverages-iron-oxygen-lithium.html
although I don't think lithium-based batteries will pan out in the very long run because lithium will be replaced with much cheaper plentiful metals (probably mainly if not entirely magnesium)
what makes me excited is that the battery technology is relentlessly improving all the time and now I am cautiously optimistic it wouldn't be very long now (well within my lifetime) before one type (and I bet it would be either magnesium-sulfur battery or a flow battery; don't know which) will be made so good as to provide ultra-cheap off-the-grid energy storage for renewable energy using only common cheap none-toxic recyclable materials and no rare-earth elements.