Jul 21, 2016 | 10:00 / Interesting information
Research opens a ‘new universe’ of organic molecules that can store energy in flow batteries
Harvard researchers have identified a whole new class of high-performing organic molecules, inspired by vitamin B2, that can safely store electricity from intermittent energy sources such as solar and wind power in large batteries.
The development builds on previous work in which the team developed a high-capacity flow battery that stored energy in organic molecules called quinones, which store energy in plants and animals, and a food additive called ferrocyanide. That advance was a game-changer, delivering the first high-performance, nonflammable, nontoxic, noncorrosive, and low-cost chemicals that could enable large-scale, inexpensive electricity storage.
While the versatile quinones showed great promise for flow batteries, Harvard researchers continued to explore other organic molecules in pursuit of even better performance. But finding that same versatility in other organic systems was challenging.
“Now, after considering about a million different quinones, we have developed a new class of battery electrolyte material that expands the possibilities of what we can do,” said Kaixiang Lin, a Ph.D. student at the Graduate School of Arts and Sciences and first author of the paper. “Its simple synthesis means it should be manufacturable on a large scale at a very low cost, which is an important goal of this project.”
Flow batteries store energy in solutions in external tanks — the bigger the tanks, the more energy they store. In 2014, Michael J. Aziz, the Gene and Tracy Sykes Professor of Materials and Energy Technologies at the Harvard John A. Paulson School of Engineering and Applied Sciences (SEAS), Roy Gordon, the Thomas Dudley Cabot Professor of Chemistry and Professor of Materials Science, Alán Aspuru-Guzik, professor of chemistry, and their team at Harvard replaced metal ions used as conventional battery electrolyte materials in acidic electrolytes with quinones. In 2015, they developed a quinone that could work in alkaline solutions alongside a common food additive.