In a landmark advancement poised to redefine battery safety standards, a research team led by Hu Yongsheng from the Institute of Physics, Chinese Academy of Sciences, has developed a novel electrolyte that physically blocks thermal runaway in sodium-ion batteries. The findings were published on April 6, 2026, in the prestigious journal Nature Energy, detailing the world’s first successful demonstration of complete thermal runaway interruption in ampere-hour (Ah)-level sodium-ion cells.
The breakthrough centres on a polymerizable non-flammable electrolyte, designated PNE, which challenges the long-held industry assumption that flame-retardant additives alone equate to battery safety. Instead of relying on a single line of chemical defence, the team constructed an intelligent, three-dimensional safety architecture integrating “thermal stability, interfacial stability, and physical isolation.”
The mechanism operates autonomously and precisely when the battery’s internal temperature rises abnormally above 150°C. At this critical threshold, the liquid PNE undergoes a rapid phase transition, solidifying into a dense, impermeable barrier. This process effectively erects what the researchers describe as a “smart firewall” inside the cell, severing the internal short-circuit pathways and ion transport channels that typically fuel the chain reaction of thermal runaway. By physically segregating the anode and cathode, the electrolyte eliminates the propagation of heat before it can escalate.
Crucially, this unprecedented safety feature does not come at the expense of performance. The research confirms that the PNE-equipped sodium-ion batteries exhibit exceptional wide-temperature operational capability, functioning reliably from -40°C to 60°C, alongside high-voltage stability exceeding 4.3V. This dual achievement of intrinsic safety and high energy density addresses a critical bottleneck that has historically hindered the deployment of sodium-ion technology in demanding applications.
Furthermore, the team emphasized the technology’s strong competitive edge in industrialization. All materials utilized in the PNE formulation are mature industrial products, circumventing the need for costly or rare new materials. This compatibility with existing manufacturing processes significantly lowers the barrier to commercial adoption.
This publication in Nature Energy re-calibrates the scientific understanding of battery safety management. By moving beyond passive chemical suppression to active physical intervention, the innovation lays a robust foundation for the widespread commercial adoption of sodium-ion batteries across diverse sectors. The implications are far-reaching, encompassing enhanced safety for electric vehicles, heavy-duty trucks, and, most notably, large-scale energy storage systems where thermal incidents pose significant operational and financial risks.
As the global battery industry seeks safer, cost-effective alternatives to lithium-ion chemistries, this self-protecting electrolyte offers a transformative pathway toward next-generation energy storage.
Source: WeChat Official Account——鑫椤锂电
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