Smartphones, tablets and other new technology rely on “Li-ion” (lithium-ion) batteries but, at the same time, this equipment is becoming ever more power-hungry. Researchers from Nantes Institut des matériaux Jean Rouxel (IMN – Université de Nantes/CNRS) and Laboratoire de Glycochimie, des antimicrobiens et des agroressources (CNRS/Université de Picardie Jules Verne) have discovered a new way to increase the energy of these batteries by adding magnesium. These results, published in Nature Communications, could lead to the development of new more competitive batteries with a lower environmental impact than current Li-ion batteries.