Researchers have found a way to take a physics phenomenon observed more than 270 years ago and apply it to modern battery materials, improving performance while keeping costs low. In a study published in Small, scientists from the Indian Institute of Science Education and Research Bhopal, Indian Institute of Technology Gandhinagar, Swansea University, and University of Southern Queensland used the Leidenfrost effect to create a better cathode for sodium-ion batteries, a promising alternative to lithium-ion systems, tells Tech Xplore.
The Leidenfrost effect happens when droplets hit a surface so hot that they levitate on a thin vapor layer, reducing contact and friction. The team exploited this physics by spraying a cathode precursor solution onto a hot plate that induces the Leidenfrost effect. As droplets hit the plate, rapid evaporation and fusion form porous powder particles without the need for high-energy furnaces.
For the cathode material, the researchers began with Na₄Fe₃(PO₄)₂(P₂O₇), known for a stable three-dimensional structure. They introduced a small amount of indium (about 1%) into the iron lattice. That substitution widened the atomic channels through which sodium ions travel, improving electronic conductivity and ion mobility. The porous particles produced in the Leidenfrost-based process also absorb electrolyte more effectively, smoothing ion transport.
Performance tests showed the optimized cathode delivered energy density near 359 watt hours per kilogram and held up through more than 10,000 charge-discharge cycles, far exceeding typical battery lifespans. Those results position the material as a strong candidate for grid-scale energy storage where cost and longevity matter most.
Sodium is abundant and inexpensive compared with lithium, making improvements in sodium-ion batteries important for renewable energy integration. The work links a classic physics curiosity with practical energy storage needs, showing that modest atomic tweaks and clever manufacturing can address long-standing barriers in battery technology.