The ability to store energy on the electric grid would greatly improve its efficiency and reliability while enabling the integration of intermittent renewable energy technologies (such as wind and solar) into baseload su. Among metalloids and semi-metals, Sb stands as a promising positive-electrode candidate for i. For all experiments, high purity (>99.9%), ultradry-grade LiF, LiCl, LiBr and LiI salts (Alfa Aesar) were used in electrolytes. Salt mixtures were dried under vacuum at 80 °C for 8 h and 250 °. Authors and AffiliationsDepartment of Materials Science and Engineering, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, Mas. Competing interestsD.J.B. and D.R.S. are co-founders of Ambri, a company established to commercialize the liquid metal battery. D.J.B. is now Chief Technology Offic. Extended Data Figure 1 Cell schematic of Li||Sb–Pb liquid metal battery.The negative current collector consists of a stainless steel rod and Fe–Ni foam. The positive current c.