Engineers designed a battery electrolyte that keeps lithium cells running in temperatures between minus eighty and one hundred degrees Celsius. Standard lithium-ion batteries freeze solid in extreme winter conditions and break down rapidly in scorching heat. The new liquid formula uses chemical side branches to reshape how solvent molecules bind to lithium ions as temperatures rise or fall.
In typical electrolytes, solvent molecules pack tightly around lithium ions and negative ions at cold temperatures, choking off electrical flow. By attaching methyl chemical groups to the solvent, the team created bulky physical barriers that act like bumpers between molecules. These bumpers prevent rigid molecular cages from locking together, allowing lithium ions to glide freely through the liquid even in deep freeze.
The researchers tested the electrolyte inside one ampere-hour commercial pouch cells built with standard nickel manganese cobalt and graphite electrodes. During continuous cycling at twenty-five degrees Celsius, the cells retained eighty-three point two percent of their capacity after four thousand complete charge cycles. When chilled to minus eighty degrees Celsius, the same cells delivered zero point four nine ampere-hours of electrical capacity and continued operating at one hundred degrees.
The researchers state this molecular shielding approach offers a practical path toward long-lasting lithium batteries that adapt across extreme temperature ranges. Iron phosphate pouch cells using the same electrolyte retained eighty-seven point four percent capacity after two thousand fast cycles and discharged stably at minus sixty degrees Celsius.