期刊
ENERGY STORAGE MATERIALS
卷 55, 期 -, 页码 73-83出版社
ELSEVIER
DOI: 10.1016/j.ensm.2022.11.037
关键词
Lithium -sulfur batteries; Hierarchical porous host; Conversion reactions; Electrocatalyst nodes; Integrated reactor architecture; Electrode micro electric field
A carbon-based heterogeneous framework host with synergistic catalytic and conductive effects is developed for high performance lithium sulfur batteries. The designed integrated reactor architecture enables high-loading sulfur host with excellent kinetic and stability of polysulfide conversion. The resultant cathode exhibits high areal capacity, long-term cycling performance, and ultrahigh rate performance.
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.
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