Media Watch - NVX related, page-186

Let's Dive Into The Battery 'Beehive' And The Buzz Surrounding Tesla
WHEN WILL WE SEE A SOLID STATE BATTERY?According to Ravindra, solid state batteries are a fantastic concept but it's still 5-6 years away from commercial scale. In theory, a solid state battery is extremely safe because you remove the (currently-used) liquid electrolytes and put in solid electrolytes making puncture not a risk for fire. The problem? Lithium-ion has a difficult time moving through solid electrolytes versus liquid ones. The other challenge is the cost. These really rare materials including lanthanum, zirconium, and silver (in some cases) which can be required to make an effective solid state battery. Currently, there just isn't enough of these materials available for it to be practical on a commercial scale. Toyota has been working on this since 2010 and they still don't have a cell that is economically viable.

https://insideevs.com/news/430956/video-tesla-battery-details-future/

In interesting insight into Lion Battery development. Cheers