For MUCH more details on this study:http://www.sciencedirect.com/science/article/pii/S0360544217306825
It is notable that part of the study assumptions is that "cheap" batteries will be used to store (renewable) energy during peak productions and then "trickle" charged to the vehicle when not being used. What I've found is that used Leafs are about the cheapest form of batteries that includes a high quality BMS . Eventually, the used EV battery market might impact this?
It would seem a more realistic approach would be to keep our existing generation/distribution systems fully loaded 24/7 by charging EVs off peak and eliminate the major inefficiencies of coal/nat gas generation turn-down. Then, judiciously feed back energy from these EVs as needed to "fill the gaps" of energy generated by the ever increasing amounts of renewable forms (and prevent peaking plants from being needed). I wonder if the results (better battery life??) would be the same under this more rigorous charging scenario?
It is possible that alternate methods are covered in the (many pages) of the study - I have only "skimmed" it at this time - but it is very interesting that it could be possible to minimize battery degradation with (really) smart grid controls.
2012 Leaf SL; 34,000 miles. 12 bars - Battery replaced November 1st, 2016.
4000 watts Grid-tied solar. 3000 watts (level II) off-grid solar Leaf charging capable.