Long-range fast-charging EVs: New battery fully charges in 15 mins at 1,747.6 W/kg

Lithium-metal batteries hold the promise of storing significantly more energy and operating in harsher environments than conventional lithium-ion batteries that power most modern electronics. However, reaching their full commercial potential has been hindered by the slow, inefficient movement of electrons and ions across the boundary between the battery's structural components and its electrolyte, a process known as charge transfer. When this transfer is sluggish, it triggers unwanted chemical reactions that form dendrites — dangerous, needle-like metallic growths that ruin battery performance and can even cause sudden fires or explosions during ultra-fast charging.

To overcome this major limitation, a team of researchers primarily from the University of Science and Technology of China redesigned the battery's electrolyte at the molecular level. Detailed in the journal Nature Energy, the team discovered a way to accelerate charge transfer by restructuring the fluid's solvent molecules.

Instead of a standard configuration, the researchers arranged the molecules to form flat, highly organized pathways, which they termed planar-aligned electron channels. This unique structural design creates a much stronger and more efficient bond between the moving electrons and the lithium ions. By streamlining this connection, the newly engineered channels dramatically speed up the underlying chemical reactions and eliminate the sluggish conditions that create hazardous dendrites.

When the team tested their engineered electrolyte in real, industrial-sized lithium-metal battery cells, the results were highly successful. The flat electron channels allowed the batteries to stably and safely reach 100% in 15 minutes at a charging power density 1,747.6 W/kg.

This research provides a reliable blueprint for overcoming the extreme electrochemical hurdles that currently keep next-generation, high-capacity batteries from entering consumer markets. If this technology is commercialized, we could see EVs with longer range and faster charging.