by Aman Tripathi: The POSTECH system maintains a smooth, dense lithium metal layer that remains stable over hundreds of cycles.
Researchers have developed a magnetic-controlled “dream battery” system that provides four times the energy storage capacity of commercial graphite anodes while maintaining a Coulombic efficiency above 99% for more than 300 cycles.
“A new battery technology has been developed that delivers significantly higher energy storage—enough to alleviate EV range concerns—while lowering the risk of thermal runaway and explosion,” said the researchers in a press release.
This development introduces a “magneto-conversion” strategy that suppresses the fire risks typically associated with high-density lithium batteries.
The research team from POSTECH, led by Professor Won Bae Kim, utilized an external magnetic field to regulate lithium-ion transport, providing a technical solution to both the range limitations and safety concerns inherent in current electric vehicle power systems.
Overcoming hazards of dendrite growth
The advancement centers on solving the formation of dendrites, which are sharp, needle-like structures that grow during repeated charging cycles in high-capacity lithium metal batteries.
In standard configurations, these structures eventually pierce the internal separator of a battery, creating internal short circuits that lead to thermal runaway and explosions.
While conventional graphite anodes are the current industry standard because they are less prone to these hazards, they have reached their inherent capacity limits.
The POSTECH system bypasses this limitation by forcing a smooth and dense lithium metal deposition layer that remains stable over hundreds of cycles.
Mechanics of magneto-conversion strategy
This stable layer is the result of applying a specific magnetic field to ferromagnetic manganese ferrite conversion-type anodes.
“When lithium is inserted into the manganese ferrite anode, it produces ferromagnetic metallic nanoparticles,” explained the researchers.
These particles align themselves like miniature magnets within the electrode under the influence of the external magnetic field. This internal organization, aided by the Lorentz force—the force exerted on charged particles moving through a magnetic field—prevents lithium ions from concentrating in specific clusters.
By dispersing the ions evenly across the surface, the system prevents the uneven growth that leads to hazardous spikes.
Future implications for next-gen energy
The resulting hybrid system stores energy through a dual mechanism, holding lithium both within an oxide matrix and as metallic lithium deposited on the surface.
“This dual mechanism enables an energy storage capacity approximately four times higher than that of commercial graphite anodes, while maintaining stable charge–discharge cycling without dendrite formation,” highlighted the press release.
The researchers confirmed that the uniform lithium layer created by the magnetic field remains dense even after extensive use, preventing the degradation that usually shortens the lifespan of high-capacity batteries.
Professor Won Bae Kim noted that this approach addresses the two primary challenges of lithium metal anodes, which are structural instability and dendrite formation. The research team expects this discovery to serve as a technical foundation for increasing the charging speed and cycle life of batteries intended for the automotive sector and large-scale energy storage systems.
“It represents a new pathway toward safer and more reliable lithium-metal batteries.” Professor Kim concluded.
“We expect this technology to serve as a foundation for improving capacity, cycle life, and charging speed in next-generation batteries.”
