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Integrated reactor architecture of conductive network and catalytic nodes to accelerate polysulfide conversion for durable and high-loading Li-S batteries
Wu, Qingping1,3,4,5; Shadike, Zulipiya6; Xu, Jun5; Cao, Fahai5; Li, Chilin1,2,3
2023
摘要The development of carbon-based heterogeneous framework host with synergistic catalytic and conductive ef-fects for sulfur cathode is a promising strategy to realize high performance lithium sulfur batteries (LSBs). Here, an integrated reactor architecture with defective carbon nodes (IRA-DC) is designed for serving as high-loading (92.4 wt%) sulfur host. The hierarchical porous IRA-DC consists of untangled conductive carbon nanotube network and Co/N co-doped catalytic nodes with high dispersity. Therein the optimization of electric field distribution and homogenization of adsorption-catalysis sites offer the multi-electron conversion reaction of polysulfides with excellent kinetics and stability. The resultant IRA-DC/S cathode enables a high areal capacity of 8.86 mAh cm-2 under ultra-high sulfur loading (13.1 mg cm-2) and lean electrolyte (8 mu L mgsulfur -1 ). It also displays a long-term cycling performance (1200 cycles at 1 C) and ultrahigh rate performance up to 20 C (with a capacity of 473.6 mAh g-1). This work provides an electrode building strategy by optimizing the environments of heterogeneous electrocatalysis and micro electric field to activate the polysulfide conversion efficiency and utilization of high-loading sulfur in monolithic sulfur-carbon cathodes.
关键词Lithium -sulfur batteries Hierarchical porous host Conversion reactions Electrocatalyst nodes Integrated reactor architecture Electrode micro electric field
DOI10.1016/j.ensm.2022.11.037
发表期刊ENERGY STORAGE MATERIALS
ISSN2405-8297
卷号55页码:73-83
通讯作者Cao, Fahai(fhcao@ecust.edu.cn) ; Li, Chilin(chilinli@mail.sic.ac.cn)
收录类别SCI
WOS记录号WOS:000913285200002
语种英语