BAM Study Flags Safety Gaps in Promising Sodium-Ion Batteries
A new study from Germany’s Federal Institute for Materials Research and Testing (BAM) has revealed that sodium-ion batteries — often seen as a sustainable and cost-effective alternative to lithium-ion technology — may require specially designed safety mechanisms before they can be deployed at scale. The research, conducted in collaboration with the European Synchrotron Radiation Facility (ESRF) in France and the Fraunhofer Institute for High-Speed Dynamics (EMI), highlights that proven safety systems used in lithium-ion cells cannot be directly transferred to sodium-based batteries. Instead, they need to be adapted to the chemistry and mechanical design of each new system. Putting Sodium-Ion Safety to the Test To explore how sodium-ion batteries react to damage, researchers performed a nail penetration test — a widely recognized procedure that simulates severe mechanical failure by driving a metal pin through a cell. The test helps determine whether a battery undergoes dangerous thermal runaway reactions, such as overheating, fire, or explosion. Using high-speed X-ray imaging at ESRF’s advanced test facilities in Grenoble, the team captured real-time footage of internal reactions inside the batteries. Three cell types were examined side by side: A Surprising Reaction The study found stark contrasts in performance. The LFP battery remained stable under stress, while the NMC cell’s built-in safety systems functioned as intended. The sodium-ion cell, however, displayed a sudden, near-explosive reaction. Researchers determined that the cause was not the sodium chemistry itself, but rather a failure in the battery’s venting system — the component responsible for releasing excess internal pressure. In this case, the vent became blocked by other safety elements during a rapid pressure buildup, preventing controlled release and triggering a violent rupture. Designing Safety for New Chemistries “Our investigations show that safety mechanisms cannot simply be transferred from one battery technology to another,” said Nils Böttcher, Head of the Battery Test Center at BAM. “For new battery types such as sodium-ion cells, mechanical components like venting systems must be specifically designed and validated.” Böttcher stressed that the findings don’t question the overall safety of sodium-ion batteries, but they underscore the need for integrated safety design — ensuring that chemical, mechanical, and thermal systems are developed in tandem. BAM is now contributing its findings to standardization efforts and international testing protocols aimed at establishing clear safety criteria for sodium-ion technologies. As the race to develop sustainable, lithium-free batteries accelerates, the study serves as a reminder that innovation must go hand in hand with safety engineering — especially when new chemistries promise to power the next generation of energy storage solutions. Source: Chemeurope.com
New Sodium-Ion Battery Breakthrough Doubles Capacity and Desalinates Water
A research team from the University of Surrey has unveiled a major leap forward for sodium-ion batteries—and it comes with a surprising side benefit: the ability to desalinate water. The team discovered that by leaving a key battery material, nanostructured sodium vanadate hydrate (NVOH), in its natural hydrated state rather than removing the water as is typically done, the resulting batteries performed dramatically better. The redesigned cells stored twice as much charge as conventional sodium-ion batteries and maintained stability for over 400 charge cycles—putting their performance on par with some of the best cathode materials currently available. “Our results were completely unexpected,” said Dr. Daniel Commandeur, Surrey Future Fellow. “Sodium vanadium oxide has been used for years, but everyone assumed the water content was a problem. When we kept it in, the battery performed far better than anyone anticipated.” Even more striking, the researchers found that the same chemistry could be used for water desalination. The material’s behaviour in salt-water suggests a potential to not only store energy but also purify water—a dual-purpose capability that could open up entirely new applications for energy and water management. “The ability to use sodium vanadate hydrate in salt water means sodium-ion batteries could do more than store energy—they could also help remove salt from water,” Dr Commandeur explained. “In the long run, this might allow systems that use seawater as a safe, abundant electrolyte while also producing fresh water.” This innovation could have major implications for the battery-storage industry, where sodium-ion technology is rapidly emerging as a viable alternative to lithium-ion systems. Lithium-based batteries still dominate global markets, powering around 70 % of all rechargeable devices—from smartphones to electric vehicles to grid-scale storage. However, lithium’s supply chain challenges and environmental footprint are pushing researchers to explore other chemistries. Sodium, in contrast, is cheap, abundant, and widely distributed across the globe. It’s also significantly less water-intensive to extract—requiring 682 times less water per tonne than lithium. “Sodium is a much more sustainable source for batteries than lithium,” said James Quinn, CEO of UK-based battery innovator Faradion. “It’s cheaper, easier to source, and more environmentally responsible.” While sodium-ion technology is not expected to replace lithium-ion batteries entirely, many experts believe the future of energy storage will rely on a combination of both. By leveraging the strengths of each—lithium for high-density applications and sodium for cost-effective, sustainable storage—the sector can build a more flexible and resilient global energy infrastructure. The University of Surrey’s discovery adds even more momentum to that vision, offering a glimpse of a future where batteries don’t just power our devices and vehicles—they may also help solve one of the world’s most pressing resource challenges: access to fresh water. ReferenceBy Haley Zaremba – Oct 25, 2025, 12:00 PM CDT, “New Sodium-Ion Battery Breakthrough Doubles Charge and Desalinates Water”, OilPrice.com.
