China has developed a sodium battery that can withstand overheating up to 300 °C

New “safe” sodium‑ion batteries from HiNa Battery

Chinese manufacturers are leaning toward the development of safer traction batteries because most mass‑produced models still use liquid electrolyte that can cause dangerous chemical reactions and sudden heat release. In response to this problem, scientists in China have created a sodium‑ion battery that does not support fire spread even at temperatures up to 300 °C.

How the new technology works
* Non‑flammable electrolyte – a polymerizing material that, when heated above 150 °C, transitions from liquid to solid state.

* At extreme temperature this “solid barrier” prevents further thermal runaway and stops the battery from igniting.

Prototype testing
Parameter Result Cell type Cylindrical sodium‑ion, capacity 3.5 Ah Pin test No fire, smoke or explosion Heating to 300 °C No adverse effects Operating temperature range –40 °C … +60 °C Charging voltage >4.3 V (stability) Energy density 211 Wh/kg

What’s next?
HiNa Battery forecasts mass deployment of sodium‑ion batteries in electric vehicles within a couple of years. Therefore, protection solutions as shown above will be in demand on the market.

*Source: CarNewsChina (resource on Chinese cars and technology).*