A crosslinking hydrogel binder for high-sulfur content S@pPAN cathode in rechargeable lithium batteries

• 作者: Huanhuan Yuan Cheng Guo Jiahang Chen Huichao Lu Jun Yang Yanna Nuli Jiulin Wang
• 来源期刊: 能源化学
• 年，卷（期）: 2021,（9）
• 页码范围: 360-367
• 页数: 8页
• 语种: 英文

摘要

High-energy density lithium-sulfur(Li-S)batteries have received intensive attention as promising energy storage system.Among diverse sulfur-based cathodes,sulfurized pyrolyzed poly(acrylonitrile)(S@pPAN)cathode delivered superior electrochemical performance.However,the sulfur content of S@pPAN is rel-atively low(＜50 wt％),which significantly limits the energy density.Herein,a hydrogel SA-Cu binder was proposed with a crosslinking network constructed by Cu2+ ions.The introduction of Cu2+ ions enabled excellent electrochemical behaviors of S@pPAN cathode even with high sulfur content of 52.6 wt％via chemical interaction with sulfur and polysulfide.Moreover,a favorable cathode interphase was formed containing electrochemically active and conductive CuSx.S@pPAN/SA-Cu exhibited a high sulfur utiliza-tion of 85.3％,long cycling stability over 1000 cycles and remarkable capacity of 1200 mAh gs-1 even at 10C.Furthermore,ascribed to the improved electrode structure,high-loading electrode(sulfur loading:4 mg cm-2)displayed stable cycling with areal capacity of 5.26 mAh cm-2(1315 mAh gs-1)after 40 cycles.This study provides new directions to prepare high-sulfur content and high-loading S@pPAN cathode for higher energy density.