China’s new 800-cycle lithium-sulfur battery could nearly double drone flight time

A Tsinghua-led team developed a molecular additive strategy for lithium-sulfur batteries that stabilizes intermediates and reduces energy loss.

The design cuts internal resistance by 75% and maintained capacity through more than 800 lab cycles.

A prototype pouch cell reached 549 Wh per 2.2 lb, close to twice the energy of many current drone batteries.

If scaled, the technology could help drones fly longer, carry heavier payloads, and perform better in delivery, inspection, and emergency missions.