【#Tech24H】The Institute of Physics of the Chinese Academy of Sciences has successfully developed a self-protective Polymerizable Non-flammable Electrolyte (PNE), achieving the world’s first complete thermal runaway suppression in ampere-hour-level sodium-ion batteries. The team has overturned the conventional understanding that “flame-retardant electrolytes equal to safety”, moving beyond a single defense line to construct a three-in-one intelligent safety protection system integrating “thermal stability, interfacial stability, and physical isolation”. When the battery temperature abnormally rises above 150°C, the PNE automatically solidifies from liquid into a dense barrier, effectively building a “smart firewall” inside the battery that completely cuts off the propagation path of thermal runaway. Notably, this breakthrough is achieved without compromising the battery’s high performance.