Chinese researchers have developed a next-generation iron-based battery that could significantly reduce the cost and improve the durability of large-scale energy storage systems used in renewable power grids.
The innovation comes from the Institute of Metal Research under the Chinese Academy of Sciences, where scientists engineered an improved all-iron flow battery featuring a redesigned electrolyte system that addresses long-standing issues such as material degradation and electrolyte leakage.
In performance testing, the battery completed over 6,000 charge-discharge cycles—equivalent to more than 16 years of daily use—without any measurable loss in capacity. It also achieved a leak resistance rate of 99.4% and maintained energy efficiency of 78.5% even under high-power conditions.
A key advancement in the design is the stabilisation of the iron-based electrolyte through molecular restructuring, which reduces unwanted side reactions and prevents material crossover inside the battery. This improvement significantly enhances long-term operational stability.
Researchers also highlighted a major cost advantage: iron is approximately 80 times cheaper than lithium, making it a far more economical option for grid-scale energy storage if commercial production is successfully achieved.
Unlike conventional lithium-ion batteries, the iron-based system uses a water-based electrolyte, which also reduces fire risk and improves safety for large installations.
Beyond cost and safety benefits, iron’s abundance on Earth provides stronger supply security compared to lithium, which faces growing demand pressure from the global clean energy transition.
While the results are highly promising, scientists caution that the technology is still in the development phase and will require further real-world testing before large-scale commercial deployment becomes possible.
The breakthrough is being seen as a potential step forward in solving one of renewable energy’s biggest challenges: affordable and long-duration storage of solar and wind power for stable electricity grids.
