4.8 Article

An Organodiselenide Comediator to Facilitate Sulfur Redox Kinetics in Lithium-Sulfur Batteries

期刊

ADVANCED MATERIALS
卷 33, 期 13, 页码 -

出版社

WILEY-V C H VERLAG GMBH
DOI: 10.1002/adma.202007298

关键词

lithium polysulfides; lithium– sulfur batteries; organodiselenides; redox comediators; sulfur redox kinetics

资金

  1. Beijing Natural Science Foundation [JQ20004]
  2. National Natural Science Foundation of China [21776019, U1801257]
  3. National Key Research and Development Program [2016YFA0202500]
  4. Scientific and Technological Key Project of Shanxi Province [20191102003]

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This study introduces diphenyl diselenide (DPDSe) as a redox co-mediator to accelerate the sulfur redox kinetics in lithium-sulfur batteries, improving rate performance and cycle stability. The use of DPDSe leads to faster sulfur redox kinetics, increased lithium sulfide deposition, and enhanced overall battery performance, demonstrating potential for high-energy density battery applications.
Lithium-sulfur (Li-S) batteries are considered as promising next-generation energy storage devices due to their ultrahigh theoretical energy density, where soluble lithium polysulfides are crucial in the Li-S electrochemistry as intrinsic redox mediators. However, the poor mediation capability of the intrinsic polysulfide mediators leads to sluggish redox kinetics, further rendering limited rate performances, low discharge capacity, and rapid capacity decay. Here, an organodiselenide, diphenyl diselenide (DPDSe), is proposed to accelerate the sulfur redox kinetics as a redox comediator. DPDSe spontaneously reacts with lithium polysulfides to generate lithium phenylseleno polysulfides (LiPhSePSs) with improved redox mediation capability. The as-generated LiPhSePSs afford faster sulfur redox kinetics and increase the deposition dimension of lithium sulfide. Consequently, the DPDSe comediator endows Li-S batteries with superb rate performance of 817 mAh g(-1) at 2 C and remarkable cycling stability with limited anode excess. Moreover, Li-S pouch cells with the DPDSe comediator achieve an actual initial energy density of 301 Wh kg(-1) and 30 stable cycles. This work demonstrates a novel redox comediation strategy with an effective organodiselenide comediator to facilitate the sulfur redox kinetics under pouch cell conditions and inspires further exploration in mediating Li-S kinetics for practical high-energy-density batteries.

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