State Key Laboratory of Urban Water Resource and Environment, School of Chemistry and Chemical Engineering, Harbin Institute of Technology, Harbin, 150001, China.
Academy of Fundamental and Interdisciplinary Sciences, Harbin Institute of Technology, Harbin, 150001, China.
Chemistry. 2019 Apr 11;25(21):5416-5421. doi: 10.1002/chem.201806231. Epub 2019 Mar 26.
Lithium-sulfur (Li-S) batteries have been recognized as outstanding candidates for energy storage systems due to their superiority in terms of energy density. To meet the requirements for practical use, it is necessary to develop an effective method to realize Li-S batteries with high sulfur utilization and cycle stability. Here, a strategy to construct heterostructure composites as cathodes for high performance Li-S batteries is presented. Taking the SnS /SnO couple as an example, SnS /SnO nanosheet heterostructures on carbon nanofibers (CNFs), named C@SnS /SnO , were designed and synthesized. Considering the electrochemical performance of SnS /SnO heterostructures, it is interesting to note that the existence of heterointerfaces could efficiently improve lithium ion diffusion rate so as to accelerate the redox reaction significantly, thus leading to the enhanced sulfur utilization and more excellent rate performance. Benefiting from the unique structure and heterointerfaces of C@SnS /SnO materials, the battery exhibited excellent cyclic stability and high sulfur utilization. This work may provide a powerful strategy for guiding the design of sulfur hosts from selecting the material composition to constructing of microstructure.
锂硫（Li-S）电池因其在能量密度方面的优势而被认为是储能系统的优秀候选者。为了满足实际应用的要求，有必要开发一种有效的方法来实现具有高硫利用率和循环稳定性的 Li-S 电池。在这里，提出了一种构建用于高性能 Li-S 电池的异质结构复合材料的策略。以 SnS/SnO 偶联物为例，设计并合成了在碳纤维（CNFs）上的 SnS/SnO 纳米片异质结构，命名为 C@SnS/SnO。考虑到 SnS/SnO 异质结构的电化学性能，有趣的是，异质界面的存在可以有效地提高锂离子扩散率，从而显著加速氧化还原反应，从而提高硫的利用率和更优异的倍率性能。得益于 C@SnS/SnO 材料的独特结构和异质界面，电池表现出优异的循环稳定性和高硫利用率。这项工作可能为从选择材料组成到构建微观结构的硫主体的设计提供了一种强大的策略。
