Designing Lithium-Sulfur Batteries with High-Loading Cathodes at a Lean Electrolyte Condition

Sheng Heng Chung, Arumugam Manthiram

研究成果: Article同行評審

14 引文 斯高帕斯(Scopus)

摘要

Developing lithium-sulfur cells with a high-loading cathode at a lean-electrolyte condition is the key to bringing the lithium-sulfur technology into the energy-storage market. However, it has proven to be extremely challenging to develop a cell that simultaneously satisfies the abovementioned metrics while also displaying high electrochemical efficiency and stability. Here, we present a concept of constructing a conductive cathode substrate with a low surface area and optimized nanoporosity (i.e., limited micropores in the porous matrix) that enables achieving a high sulfur loading of 13 mg cm -2 and a high sulfur content of 75 wt % with an extremely low electrolyte/sulfur ratio of just 4.0 μL mg -1 . The high-loading nanocomposite cathodes demonstrate high-areal capacities of 9.3 mA h cm -2 , high energy densities of 18.6 mW h cm -2 , and superior cyclability with excellent capacity retention of 85% after 200 cycles. These values are higher than the benchmarks set up for developing future commercial lithium-sulfur cells (i.e., areal capacity of >2-4 mA h cm -2 , energy density of >8-13 mW h cm -2 , and a long cycle life of 200 cycles with a capacity retention of 80%). The cathode design further exhibits high-rate capability from C/20 to 1 C rates and great potential to attain ultrahigh sulfur loading and a content of 17 mg cm -2 and 80 wt %. The key nanostructural feature that enables realizing fast-charge transport is the low surface area and limited microporosity that avoid the fast consumption of the electrolyte during cell cycling.

原文English
頁(從 - 到)43749-43759
頁數11
期刊ACS Applied Materials and Interfaces
10
發行號50
DOIs
出版狀態Published - 2018 十二月 19

All Science Journal Classification (ASJC) codes

  • 材料科學(全部)

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