Lithium beware - Rapid tech evolution

https://wattsupwiththat.com/2017/12/05/new-batteries-for-evs-use-rust-for-power-storage/

Jülich, 3 November 2017 – Iron–air batteries promise a considerably higher energy density than present-day lithium-ion batteries. In addition, their main constituent – iron – is an abundant and therefore cheap material. Scientists from Forschungszentrum Jülich are among the driving forces in the renewed research into this concept, which was discovered in the 1970s. Together with American Oak Ridge National Laboratory (ORNL), they successfully observed with nanometre precision how deposits form at the iron electrode during operation. A deeper understanding of the charging and discharging reactions is viewed as the key for the further development of this type of rechargeable battery to market maturity. The results were published in the renowned journal Nano Energy.