Honeycomb‐Like Spherical Cathode Host Constructed from Hollow Metallic and Polar Co9S8 Tubules for Advanced Lithium–Sulfur Batteries,Advanced Functional Materials

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Honeycomb‐Like Spherical Cathode Host Constructed from Hollow Metallic and Polar Co9S8 Tubules for Advanced Lithium–Sulfur Batteries
Advanced Functional Materials ( IF 18.5 ) Pub Date : 2018-02-01 , DOI: 10.1002/adfm.201704443
Chunlong Dai ₁ , Jin-Myoung Lim ₂ , Minqiang Wang ₁ , Linyu Hu ₁ , Yuming Chen ₃ , Zhaoyang Chen ₁ , Hao Chen ₁ , Shu-Juan Bao ₁ , Bolei Shen ₁ , Yi Li ₁ , Graeme Henkelman ₂ , Maowen Xu ₁

Affiliation

The practical application of lithium‐sulfur (Li‐S) batteries remains remote because of rapid capacity fade caused by the low conductivity of sulfur, dissolution of intermediate lithium polysulfides, severe volumetric expansion, and slow redox kinetics of polysulfide intermediates. Here, to address these obstacles, a new sulfiphilic and highly conductive honeycomb‐like spherical cathode host constructed from hollow metallic and polar Co₉S₈ tubes is designed. Co₉S₈ can effectively bind polar polysulfides for prolonged cycle life, due to the strong chemisorptive capability for immobilizing the polysulfide species. The hollow structure, as the sulfur host, can further prevent polysulfide dissolution and offer sufficient space to accommodate the necessary volume expansion. Well‐aligned tubular arrays provide a conduit for rapid conduction of electrons and Li‐ions. More importantly, the experimental results and theoretical calculations show that Co₉S₈ plays an important catalytic role in improving the electrochemical reaction kinetics. When used as cathode materials for Li–S batteries, the S@Co₉S₈ composite cathode exhibits high capacity and an exceptional stable cycling life demonstrated by tests of 600 cycles at 1 C with a very low capacity decay rate of only ≈0.026% per cycle.

中文翻译：

由空心金属和极性Co9S8小管构造的蜂窝状球形阴极主体，用于高级锂硫电池

由于硫的低电导率，中间的多硫化锂中间物的溶解，严重的体积膨胀以及多硫化物中间体的氧化还原动力学较慢而导致容量快速衰减，因此锂硫（Li-S）电池的实际应用仍然遥遥无期。在这里，为了解决这些障碍，设计了一种由空心金属和极性Co ₉ S ₈管构成的新的具有亚砜基，高导电性的蜂窝状球形阴极主体。Co ₉ S ₈由于具有强大的固定化多硫化物种类的化学吸附能力，因此可以有效地结合极性多硫化物以延长循环寿命。作为硫主体的中空结构可以进一步防止多硫化物溶解，并提供足够的空间来容纳必要的体积膨胀。排列良好的管状阵列为快速传导电子和锂离子提供了导管。更重要的是，实验结果和理论计算表明，Co ₉ S ₈在改善电化学反应动力学方面起着重要的催化作用。当用作Li–S电池的正极材料时，S @ Co ₉ S ₈ 复合阴极具有高容量和出色的稳定循环寿命，通过在1 C下进行600个循环的测试即可证明，其极低的容量衰减率仅为每个循环约0.026％。

更新日期：2018-02-01

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