A research team at Pohang University of Science and Technology (POSTECH) has pioneered a magnetic control system for lithium, suppressing dangerous dendrite growth and enabling a battery anode with four times the capacity of commercial graphite. This “magneto-conversion” strategy, led by Professor Won Bae Kim, uses an external magnetic field to guide lithium ions, paving the way for safer, higher-energy “dream batteries” for EVs and grid storage.
The quest for a “dream battery”—one that stores massive amounts of energy without the risk of fiery explosion—has long haunted the electric vehicle industry. The culprit is often lithium metal, an anode material with incredible theoretical capacity but a dangerous tendency to grow spiky, tree-like dendrites that can pierce a battery’s interior and cause catastrophic failure. Now, a novel solution from South Korea doesn’t rely on complex chemistry alone but on the simple, elegant power of magnets. Scientists have found a way to use a magnetic field to make lithium behave, opening a new pathway to safety and performance.
The breakthrough, published in the prestigious journal Energy & Environmental Science, was led by Professor Won Bae Kim of POSTECH’s Department of Chemical Engineering and the Graduate School of Battery Engineering, along with researchers Dr. Song Kyu Kang and integrated Ph.D. student Minho Kim. Their “magneto-conversion” strategy targets a specific type of anode made from ferromagnetic manganese ferrite. When lithium ions enter this anode during charging, they generate tiny ferromagnetic metallic nanoparticles. Here’s where the magic happens: an externally applied magnetic field forces these nanoparticles to align in an orderly fashion. This alignment, combined with the Lorentz force acting on the moving ions, acts like a traffic control system, spreading lithium ions evenly across the electrode’s surface.
READ ALSO: https://modernmechanics24.com/post/russia-artificial-gravity-space-station/
“The idea was simple,” the team noted in their publication, according to the POSTECH release. “If a magnet can align iron filings, why not use it to organize the flow of lithium ions?” The result is transformative. Instead of chaotic, jagged dendrites, the lithium forms a smooth, dense, and uniform metal layer. The anode operates as a hybrid, storing energy both within its oxide structure and as metallic lithium on its surface. This dual mechanism delivers a stunning approximately four times higher energy storage capacity than the graphite anodes used in today’s EVs.
Crucially, this isn’t achieved at the expense of stability. The research team reported that the battery maintained a Coulombic efficiency above 99% for more than 300 cycles, a key indicator of excellent long-term health and rechargeability. This directly tackles the twin demons of lithium metal batteries: instability and dendrite-driven short circuits.
Professor Won Bae Kim, who led the research, stated, “This approach simultaneously addresses the two biggest challenges of lithium metal anodes. It represents a new pathway toward safer and more reliable lithium-metal batteries.” He added that the team expects the technology to serve as a foundational improvement for the capacity, cycle life, and charging speed of next-generation batteries. Supported by grants from the National Research Foundation of Korea (NRF) and the Korea Institute for Advancement of Technology (KIAT), this magnetic intervention points toward a future where range anxiety and battery safety fears could both be powerfully diminished.
WATCH ALSO: https://modernmechanics24.com/post/us-supersonic-jet-cuts-flight-time-silences-sonic-boom/
