"Something called a solid electrolyte interphase (SEI) layer naturally forms when a battery discharges and recharges. Drawing from this example, scientists at Aalto University in Finland have developed a carbon-dioxide-based coating for electrodes that they found can allow for the battery to be recharged and used longer."

"The coating also opens the door for the use of new, more efficient materials for battery electrodes, such as metallic lithium."

https://www.designnews.com/materials/coating-paves-way-more-durable-efficient-batteries