期刊
ADVANCED FUNCTIONAL MATERIALS
卷 32, 期 2, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adfm.202107166
关键词
carbon materials; heteroatom doping; lithium sulfur batteries; metal compounds; metal single atom; sulfur host materials
类别
资金
- Taihu Electric Corporation [0001]
Lithium sulfur batteries, with high theoretical capacity and energy density, face challenges such as poor conductivity of active sulfur, large volume expansion of cathode, and shuttle effect of lithium polysulfides. Heteroatom doping is proposed to manipulate the electronic structure and improve the performance of sulfur host materials for enhanced cell performance.
High theoretical capacity and high energy density make lithium sulfur (Li-S) batteries a competitive candidate for next-generation energy storage systems. However, achieving the practical application of Li-S batteries is still a huge challenge due to some inevitable obstacles. Poor conductivity of active sulfur, large volume expansion of cathode, and severe shuttle effect of lithium polysulfides (LiPSs) greatly limit the capacity of cells and lead to unsatisfied cycle performance. Therefore, various sulfur host materials have been proposed and investigated, which should possess good conductivity, porous structure, and strong immobilization capability for LiPSs. Unfortunately, it is incompetent to cover all the advantages mentioned above for pristine materials. Heteroatom doping fundamentally manipulates the electronic structure and polarity of materials, leading to some unprecedented properties, and subsequent enhancement in electrochemical performance. This review systematically summarizes the recent progress of heteroatom (metal single atom and non-metal atom) doping in various materials including carbon materials, graphitic carbon nitride (g-C3N4), and metal compounds as the ideal sulfur host. Furthermore, the relationship between the unique features of sulfur host materials originated from heteroatom doping and enhanced performance of cells is comprehensively discussed.
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