Leakage‐Proof Electrolyte Chemistry for a High‐Performance Lithium–Sulfur Battery
Jiangwei Ju, Shanmu Dong, Yanyan Cui, Yanfen Zhang, Ben Zhong Tang, Feng Jiang, Zili Cui, Huanrui Zhang, Xiaofan Du, Tao Lü, Lang Huang, Guanglei Cui, Liquan Chen
Abstract
Abstract Electrolyte leakage is a severe safety concern in lithium batteries. With highly volatile 1,2‐dimethoxyethane as solvent, the leakage related hazards are more pronounced in lithium‐sulfur (Li‐S) batteries. To address this concern, a leakage‐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. The moisture from ambient can also catalyze a further polymerization of the macromolecules to seal the leaking points and thereby to solve the leakage issue, endowing Li‐S batteries superior safety even in an artificial cut pouch cell. With a bare S loading of 4.9 mg cm −2 , the battery can deliver good endurance owing to the suppressed polysulfide shuttle by its polar groups. This work enlightens the design of leakage‐proof electrolyte and makes a milestone for high performance Li‐S batteries.