New lithium–oxygen battery composite could enable cross-country EVs, all-day drones

Meeting the world’s energy needs comes down to one thing: continually re-engineering battery structures. And the lithium–oxygen batteries could be the next big thing. Now, researchers at the Shibaura Institute of Technology in Japan have developed a cheap, platinum-free catalyst that solves a major roadblock for high-energy lithium–oxygen batteries. Lithium–oxygen batteries offer up to ten times the energy density of standard lithium-ion cells. And companies claim that the tech could promise cross-country EV driving and hours of continuous drone flight in the future. However, these batteries remain stuck in coming to market largely due to sluggish oxygen reactions during charging and discharging. This inefficiency drains massive amounts of energy. Precious metals like platinum and ruthenium can speed up the process, but their high cost makes them impractical for mass production. The new study has tried to solve this problem. A team led by Professor Takahiro Ishizaki at SIT has designed a non-precious heterostructured catalyst that rivals platinum at a fraction of the cost. “The platinum-free catalyst could allow longer-range electric vehicles and extended-endurance drones, offering a cost-effective and sustainable path toward next-generation energy storage,” the researchers noted. Driven by the goal of solving the slow oxygen reactions that cripple lithium–oxygen batteries, Prof. Ishizaki’s team investigated combining two distinct materials into a single composite. It included perovskite and spinel oxides. Both oxides are already known to be decent catalysts individually. In this work, the researchers set out to test whether merging them would create a powerful synergistic effect that outperforms either material on its own. Interestingly, merging these two materials creates a powerful synergy that accelerates both oxygen reduction and evolution reactions. This dual action revealed a record-low potential gap between charging and discharging of just 1.14 V. Lower voltage gaps mean less wasted power. Further, the synthesized individual metal oxides and their composite were tested to check the performance as battery catalysts. The composite outperformed both individual materials. It outperformed commercial ruthenium oxide during charging while matching heavy-hitter platinum during discharging. Boosting performance of EVs and drones Testing of the new composite’s physical properties showed that it actually possessed the lowest total electrochemical surface area among all tested candidates. Typically, battery engineers believed that bigger surface areas yielded better performance by offering more reaction sites. The SIT team’s work showed otherwise. Instead of sheer surface quantity, catalytic speed is dictated by electronic structure quality. Combining the two oxides created abundant oxygen vacancies at the molecular interface, creating an electronic pathway where oxygen reactions slide through effortlessly. The finding could pave the way for ultra-long-range EVs and drones. Prof. Ishizaki explained, “The primary and most immediate application of these findings lies in the development of highly efficient air cathodes for next-generation LOBs, which could ultimately power long-range electric vehicles and extended-endurance drones that require energy capacities far exceeding what current lithium-ion technology can provide. While urban air mobility remains a longer-term aspiration, this work represents a critical step toward realizing the transformative potential of LOBs.” This cost-effective design makes it an alternative to lithium–oxygen batteries, offering a cheap, sustainable solution for green hydrogen production, large-scale metal–air batteries, and grid storage for solar and wind energy.Recommended ArticlesMrigakshi is a science journalist who enjoys writing about space exploration, biology, and technological innovations. Her work has been featured in well-known publications including Nature India, Supercluster, The Weather Channel and Astronomy magazine. If you have pitches in mind, please do not hesitate to email her.