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. . Lithium-oxygen batteries (LOBs) are considered to be the next generation of high-specific-energy storage devices. To improve the practical specific energy, LOBs typically require thick cathode electrodes to achieve higher areal capacity. However, due to the inefficient O 2 diffusion within the. . The POSTECH system maintains a smooth, dense lithium metal layer that remains stable over hundreds of cycles.