Porous carbon mat as an electrochemical testing platform for investigating the polysulfide retention of various cathode configurations in Li-S cells

Sheng Heng Chung, Richa Singhal, Vibha Kalra, Arumugam Manthiram

研究成果: Article同行評審

56 引文 斯高帕斯(Scopus)

摘要

Two optimized cathode configurations (a porous current collector and an interlayer) are utilized to determine the better architecture for improving the cycle stability and reversibility of lithium-sulfur (Li-S) cells. The electrochemical analysis on the upper-plateau discharge capacity (QH) and the lower-plateau discharge capacity (QL) is introduced for assessing, respectively, the polysulfide retention and the electrochemical reactivity of the cell. The analysis results in line with the expected materials chemistry principles suggest that the interlayer configuration offers stable cell performance for sulfur cathodes. The significance of the interlayer is to block the free migration of the dissolved polysulfides, which is a key factor for immobilizing and continuously utilizing the active material in sulfur cathodes. Accordingly, the carbon mat interlayers provide sulfur cathodes with a high discharge capacity of 864 mA h g-1 at 1 C rate with a high capacity retention rate of 61% after 400 cycles.

原文English
頁(從 - 到)2163-2169
頁數7
期刊Journal of Physical Chemistry Letters
6
發行號12
DOIs
出版狀態Published - 2015 六月 18

All Science Journal Classification (ASJC) codes

  • Materials Science(all)

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