Toyota reveals smart battery breakthrough with magnesium
Scientists at Toyota in North America may have unlocked the secret to using magnesium in rechargeable batteries, which could replace lithium as a safer and more energy-dense option in a wide-ranging selection of applications from mobile phones to cars. By using magnesium instead of lithium, which is unstable and can combust when exposed to air, batteries could increase in energy density by 8 to 12 times, and have a charge-discharge efficiency of at least 5 times higher. The reason for this is that magnesium carries a double positive charge, which elevates the overall energy density for any size of battery pack. However, there are still problems to be solved before the technology becomes mainstream, although Toyota are hoping that other researchers will pick up on their findings, and all work together to speed up the commercial viability of magnesium-ion batteries.

Toyota Scientists Make Breakthrough on Safer, Smarter Batteries



ANN ARBOR, Mich. (May 4, 2016) — For anyone (i.e. everyone) who’s ever panicked when their mobile device chirped, “low battery,” the future could be far less stressful, thanks to the advanced battery research of scientists at the Toyota Research Institute of North America (TRINA). A new breakthrough involving magnesium batteries may soon open the doors for smaller, longer-lasting batteries for everything from cars to cell phones.



What’s the Big Deal with Magnesium?

Magnesium metal has long been theorized as a much safer and more energy-dense alternative to current lithium battery technology. Lithium metal, in its natural state, is unstable and can ignite when exposed to air. In order to make lithium metal safe for batteries, ions are taken from the lithium metal and embedded into graphite rods, which are then used in batteries. That lack of actual metal, however, limits the amount of power a battery can store. Magnesium, on the other hand, is a very stable metal with the potential to store much more energy. But until now, research on magnesium-based batteries was limited because a magnesium-friendly electrolyte did not exist.



Close Collaboration Leads to Discovery

Enter Toyota principal scientist and chemical engineer Rana Mohtadi. Mohtadi was researching hydrogen storage materials and their application to fuel cell technology; upon hearing her fellow researchers discussing the challenges of developing an electrolyte for a practical magnesium battery, Mohtadi realized her hydrogen storage material might just solve the longstanding problem. With further experimentation and the help of fellow researchers, her theory proved correct.



“We were able to take a material that was only used in hydrogen storage and we made it practical and very competitive for magnesium battery chemistry,” said Mohtadi. “It was exciting.”



Just as exciting as the discovery itself is how Toyota’s culture of diversity and collaboration played a key role.



“The results really speak to the strength in our group,” said Energy Storage Group Manager Paul Fanson. “We try to put people from diverse backgrounds and diverse technologies together and allow them to collaborate. This is a great example of that working very successfully.”



Don’t Toss Your LiPo Just Yet

While it’s easy to get caught up in the potential of a dramatically improved battery, it could take 20 years of research and development before magnesium batteries reach the consumer market. To help move the process along, Toyota’s scientists aren’t keeping their discovery to themselves. Fellow researcher Oscar Tutusaus, who collaborated with Mohtadi on the discovery, said, “We want to make this electrolyte a standard for magnesium batteries… and we want other researchers to develop it further so these batteries can see the light of day.”



A paper detailing their discovery entitled, “An Efficient Halogen-Free Electrolyte for Use in Rechargeable Magnesium Batteries,” was recently published in Angewandte Chemie International Edition (Vol. 54, Issue 27).



