Researchers announce that a “New battery technology from the University of Michigan should be able to prevent the kind of fires that grounded Boeing 787 Dreamliners in 2013.” The use of the word “should” is instructive, since scientist usually couch such announcements in more guarded terms. Battery separator materials are usually not the glamorous part of cell development, most headlines given to electrode and electrolyte breakthroughs. Kevlar may be a way, within batteries, of preventing a breakthrough. Nanofibers extracted from Kevlar, that impenetrable material in bullet-proof vests, “stifles the growth of metal tendrils that can become unwanted pathways for electrical current,” according to a University of Michigan report. Separator material stands between layers of other battery materials and ideally allows the passage of ions between electrodes in the battery. As the researchers report, “The innovation is an advanced barrier between the electrodes in a lithium-ion battery.” The nanofiber material has openings large enough to allow transfer of ions between anode …