4.6 Article

Dithiothreitol-assisted polysulfide reduction in the interlayer of lithium-sulfur batteries: a first-principles study

期刊

PHYSICAL CHEMISTRY CHEMICAL PHYSICS
卷 21, 期 30, 页码 16435-16443

出版社

ROYAL SOC CHEMISTRY
DOI: 10.1039/c9cp01036j

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资金

  1. NSFC [21702041, 51402078, 21503065]
  2. 111 Project New Materials and Technology for Clean Energy'' [B18018]
  3. Key Laboratory of Advanced Functional Materials and Devices of Anhui Province [PA2017AKZS0001]
  4. Fundamental Research Funds for the Central Universities [JZ2018HGBZ0100]

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Lithium-sulfur batteries are attracting more and more attention due to the high specific energy density and specific capacity density. The severe shuttle effect during the charge/discharge cycle causes significant performance degradation, and has become a great challenge for the practical application of rechargeable lithium-sulfur batteries. The biological reductant dithiothreitol (DTT) in the interlayer of lithium-sulfur batteries could reduce the shuttle effect by chemically cutting the polysulfide. The biocatalysts of molecular scission provide a gentle and innovative way to address the problems in lithiumsulfur batteries. Understanding the specific working principle of DTT would serve to expand the application of reducing agents in lithium-sulfur battery systems. A systematic theoretical study has been performed on the DTT-assisted polysulfide reduction. The steps for DTT to reduce the polysulfide chains, including the intermediate product of each reduction step (i.e. cleavage site of polysulfides) were clarified. The difference between the reduction of long chain and short chain polysulfides and the modification method of DTT to promote the reduction kinetics were also unraveled. It is hoped that our study could provide mechanistic insights into the DTT promoted performance of Li-S batteries and give inspiration for biological reagent expansion.

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