Scientists Invent a Lithium-Ion Battery That Works Even When It's On Fire - Slashdot

A team of scientists led by Yi Cui, a materials scientist at Stanford, have created a new "fireproof" solid-state electrolyte for use in lithium-ion batteries. IEEE Spectrum reports: They used a flame-retardant material called decabromodiphenyl ethane, or DBDPE for short. To make their new solid-state electrolyte, the team first created a thin film by combining DBDPE with polyimide, a mechanical enforcer. Using polyimide has many advantages, says Wan. Apart from being "mechanically really strong," it boasts a high melting point (making it less likely that a short circuit will occur), a solutions-based manufacturing process (that's compatible with how batteries are made today), and it's inexpensive (3M even has film tapes made from it). The hitch, however, is that polyimide can't conduct ions. To get around this snag, Wan and his colleagues added two different polymers, polyethylene oxide (PEO) and lithium bistrifluoromethanesulfonylimide (LiTFSI), to the mix. "It's innovative -- they've smartly used co-polymers, which is a new way to solve the flammable polymer electrolyte battery problem," says Chunsheng Wang, a researcher who studies new battery technologies at the University of Maryland. The paper has been published in the journal Nano Letters.