多硫化物
材料科学
碳纳米管
分离器(采油)
合金
纳米颗粒
硫黄
复合材料
化学工程
锂硫电池
无机化学
电化学
纳米技术
电极
复合数
冶金
电解质
化学
物理
物理化学
工程类
热力学
作者
Junpeng Shang,Chongyang Ma,Cuijuan Zhang,Wenwen Zhang,Baoguo Shen,Fenghua Wang,S. Guo,Shanshan Yao
标识
DOI:10.1016/j.est.2024.110552
摘要
The large-scale applications of lithium sulfur batteries have been limited by their rapid capacity loss, which can be attributed to the dissolution of polysulfide intermediates and subsequent irreversible shuttling effect. Several strategies have been attempted to the solve these problems by designing novel cell structure, including the modification of separator. Herein, a hybrid composite consisting of trimetallic CoNiFe alloy nanoparticles encapsulated with nitrogen doped carbon decorated carbon nanotubes (NC@CoNiFe/CNTs) was designed and coated on polypropylene (PP) separator for lithium sulfur batteries. The conductivity of mesoporous CNTs provide fast electronic transport and improve the sulfur utilization. The NC@CoNiFe nanoparticles can further adsorb the soluble polysulfides and serve as catalysts to promote the redox kinetics of polysulfides conversion. Benefiting from the synergism of physical confinement, chemical adsorption, and catalytic conversion, the lithium sulfur cell based NC@CoNiFe/CNTs-PP delivers excellent electrochemical performance at high sulfur loading. The lithium sulfur cell with NC@CoNiFe/CNTs-PP under 3.8 mg cm−2 sulfur loading exhibits a high initial capacity of 785.4 mAh g−1 at 0.5C and sustain a capacity of 572.4 mAh g−1 after 240 cycles, corresponding to a retention rate of 72.9 %. The cell with a high sulfur loading of 8.9 mg cm−2, it shows a discharge capacity of 8.89 mAh cm−2 and still maintains 7.24 mAh cm−2 over 100 cycles.
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