Researchers at the Chinese Academy of Sciences, Institute of Physics, have made a breakthrough that could unlock a true holy grail in battery safety, marking a monumental stride into the energy storage sector. The scientists, led by Professor Hu Yongsheng, recently reported the results in the journal Nature Energy about the production of the world’s first ampere-hour-level so-called zero-thermal-runaway sodium-ion battery.
This study was published in Nature Energy under the title “Thermal runaway-free ampere-hour-level Na-ion battery via polymerizable non-flammable electrolyte“.
This important breakthrough was announced in April 2026 and changes the paradigm in commercial battery manufacturing. Through the development of a new self-protective Polymerizable Non-flammable Electrolyte (PNE), the research team has managed to effectively remove the risks of fire and explosion that have been a bane of large-scale power systems for a long time. This breakthrough may help to jump-start the use of sodium-based technologies dramatically as the world finds viable alternatives to lithium.
Cracking the Zero Thermal Runaway Mechanism
What is really brilliant about this breakthrough is that it is not only a passive fire retardation but also an active three-level thermal block defense. Instead of simply reducing a fire, the new PNE system takes the attack on the fire by eliminating the threat within and without, causing a disastrous failure.
To start with, the specialized electrolyte is designed with exceptional decomposition properties. It serves as a thermal sponge, which absorbs heat as an initial step in a thermal event. This successfully suppresses the exothermic reactions that normally cause a thermal runaway situation in the typical cells.
Power of In Situ Thermal Polymerization
The second line of defense includes an interesting property of phase-change referred to as in situ thermal polymerization. Above 150 C, the liquid electrolyte will be quickly converted into a solid network polymer.
This sudden phase transition forms a strong physical barrier within the cell. It is effective in preventing the melting of the battery separator, eliminating any internal shorting, and eliminating any hazardous gas production.
Business Practicability and Uncompromised Performance
Lastly, a special dual-salt system creates a protective coating on both the cathode and anode. This important chemical process allows the cell to be structurally sound when using a high-voltage operation, and it is a direct extension of the cycle life of the sodium-ion battery as a whole.
The fact that this new energy storage solution is immediately commercially ready is one of the best opportunities for this new solution. The raw materials employed in the synthesis of the PNE system are standard, commercially available raw materials. This predisposes the technology as cost-effective, scalable, and extremely useful in industrial production.
Moreover, it is not at a cost to efficiency that this unprecedented safety has been achieved. The PNE-based batteries have already passed through the most rigorous safety tests that the industry has to offer, passing both the destructive nail penetration test and the extreme hot box test of 300 °C.
In spite of having to withstand these harsh conditions, the electrochemical performance of the cells is remarkable. The new sodium-ion battery has a broad temperature range -40 °C to 60 °C- it works perfectly under these conditions. It further has high-voltage stability of more than 4.3V, a compromise between high energy density and total safety.
The Future of Scalable, Sustainable Energy Storage
With a growing global need for carbon-neutral energy and lightweight power systems that are reliable, manufacturers have shifted their focus towards abandoning lithium-ion, which is both costly and volatile. Sodium is extremely inexpensive and in abundance, which makes it a perfect alternative to utility-scale power grids and large-scale commercial applications.
Before this research, one of the obstacles to extensive adoption was safety issues related to thermal events. Now, with this new development of the Chinese Academy of Sciences, battery manufacturers will be able to achieve equality between high electrochemical performance and unmatched reliability.
This zero thermal runaway innovation is not only a scientific milestone in terms of grid operators, manufacturers of electronics, and the electric vehicle industry. It provides a more economically viable, safer, and sustainable way ahead in the global clean energy transition.
