LAUSR

Lithium-sulfur (Li-S) batteries with high sulfur utilization, long-cycle life and dendrite free feature hold great promise for development of next-generation energy storage devices of high energy density. Considerable efforts have beencommitted to solving the polysulfide shuttle problem toward highly stable Li-S batteries. Here, a unique polymer network containing dually anchored ionic liquids (DA-PIL) has been devolped to improve the cycling performance and coulombic efficiency of Li-S batteries. This DA-PIL electrolyte incorporates the amphiphilicity of both polysulfides anion and lithium cation, creating an ionic function layer on PP separator. Noteworthily, the DA-PIL network is "clean" regarding that no free ionic specifies are introduced to the electrolyte system. The DA-PIL layer not only enable strong supression against polysulfide shuttling but simultaneously allows fast lithium transportation owing to cooperate electrostatic interaction among anchored cations and anions. The DA-PIL layer functionalized on PP separator can boost excellent stability of Li-S battery with >1600 h cycling test at 0.25 mA cm-2 . The Li-S cell with DA-PIL layer delivered a higher discharge capacity of 827.4 mAh g-1 at 1C. A discharge capacity of 630.6 mAh g-1 was retained after 1000 cycles. This article is protected by copyright. All rights reserved.