He Jiarui, Chen Yuanfu, Manthiram Arumugam
Materials Science and Engineering Program & Texas Materials Institute, The University of Texas at Austin, Austin, TX 78712, USA; State Key Laboratory of Electronic Thin Films and Integrated Devices, University of Electronic Science and Technology of China, Chengdu 610054, PR China.
State Key Laboratory of Electronic Thin Films and Integrated Devices, University of Electronic Science and Technology of China, Chengdu 610054, PR China.
iScience. 2018 Jun 29;4:36-43. doi: 10.1016/j.isci.2018.05.005. Epub 2018 May 23.
Lithium-sulfur (Li-S) batteries are an appealing candidate for advanced energy storage systems because of their high theoretical energy density and low cost. However, rapid capacity decay and short cycle life, mainly resulting from polysulfide dissolution, remains a great challenge for practical applications. Herein, we present a metal-organic framework (MOF)-derived CoS array anchored onto a chemical vapor deposition (CVD)-grown three-dimensional graphene foam (CoS-3DGF) as an efficient sulfur host for long-life Li-S batteries with good performance. Without polymeric binders, conductive additives, or metallic current collectors, the free-standing CoS-3DGF/S cathode achieves a high areal capacity of 10.9 mA hr cm even at a very high sulfur loading (10.4 mg cm) and sulfur content (86.9 wt%). These results are attributed to the unique hierarchical nanoarchitecture of CoS-3DGF/S. This work is expected to open up a promising direction for the practical viability of high-energy Li-S batteries.
锂硫（Li-S）电池因其高理论能量密度和低成本，成为先进储能系统中颇具吸引力的候选者。然而，主要由多硫化物溶解导致的快速容量衰减和短循环寿命，仍是实际应用中的巨大挑战。在此，我们展示了一种金属有机框架（MOF）衍生的CoS阵列，其锚定在化学气相沉积（CVD）生长的三维石墨烯泡沫（CoS-3DGF）上，作为长寿命高性能锂硫电池的高效硫宿主。无需聚合物粘结剂、导电添加剂或金属集流体，自立式CoS-3DGF/S阴极即使在非常高的硫负载量（10.4 mg cm）和硫含量（86.9 wt%）下，也能实现10.9 mA hr cm的高面积容量。这些结果归因于CoS-3DGF/S独特的分级纳米结构。这项工作有望为高能锂硫电池的实际可行性开辟一个有前景的方向。
