1. Researchers at ETH Zurich have developed a new method to significantly reduce the amount of environmentally harmful fluorine in lithium-metal batteries, making them more sustainable. 2. This new approach involves using electrostatic attraction to control the formation of a protective layer in the battery, enhancing stability and reducing costs. 3. The method has been successfully tested in coin-sized batteries and is now being scaled up for use in pouch cells, commonly used in smartphones.