Leakage‐Proof Electrolyte Chemistry for a High‐Performance Lithium–Sulfur Battery

Abstract

Electrolyte leakage is as evere safety concern in lithium batteries.W ithh ighly volatile 1,2-dimethoxyethane as solvent, the leakage related hazards are more pronounced in lithium-sulfur (Li-S) batteries.T oa ddress this concern, al eakage-proof electrolyte is delicately designed through functionalizing the commercial electrolyte by Li 6 PS 5 Cl-grafted poly(ethyl cyanoacrylate), which can interact readily with the aluminum-plastic packing through hydrogen bond to immobilize the electrolyte.T he moisture from ambient can also catalyze af urther polymerization of the macromolecules to seal the leaking points and therebyt os olve the leakage issue, endowing Li-S batteries superior safety even in an artificial cut pouchc ell. With ab are Sl oading of 4.9 mg cm À2 ,t he battery can deliver good endurance owing to the suppressed polysulfide shuttle by its polar groups.T his work enlightens the design of leakage-proof electrolyte and makes am ilestone for high performance Li-S batteries.