4.8 Article

Regulating evolution of valence bonds on carbon surface to inhibit dissolution of polysulfides during production

Journal

CARBON
Volume 169, Issue -, Pages 142-154

Publisher

PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.carbon.2020.07.062

Keywords

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Funding

  1. National Natural Science Foundation of China [51672165, 21603109]
  2. Xi'an Key Laboratory of Green Manufacture of Ceramic Materials Foundation [2019220214SYS017CG039]
  3. Key Program for International S&T Cooperation Projects of Shaanxi Province [2020KW-038, 2020GHJD-04]
  4. Science and Technology Programof Xi'an, China [2020KJRC0009]
  5. Shaanxi Provincial Education Department [19JK0137, 20JY001]
  6. Science and Technology Resource Sharing Platform of Shaanxi Province [2020PT-022]
  7. Henan Joint Fund of the National Natural Science Foundation of China [U1404216]

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Polysulfides (Li2Sx) have become key points that limit capacity improvement of lithium-sulfur batteries because of their high solubility. Oxygen-containing functional groups (such as C-O-H, C-O-C and C=O) can effectively relieve a large amount of polysulfide dissolution due to their strong polarity. However, their types and contents on polysulfide-capturing abilities are still unknown. Therefore, three kinds of electrodes containing different contents of hydroxyl (C-O-H), ether (C-O-C) and carbonyl (C=O) groups on carbon surface are controlled by changing pyrolysis times of dandelion. Electrochemical performance of lithium-sulfur batteries is tested to analyze influence of these groups on polysulfide-capturing abilities. It is discovered that C=O and C-O-H groups can obviously inhibit shuttle effects of polysulfides during their initial production. In addition, a large number of C=O bonds are converted to C-O-H bonds. More C-O-H bonds facilitate reversible capture of polysulfides and improve capacities. The introduction of C-O-C groups is not suitable for capturing more polysulfides rapidly and the appearance of ether groups limits conversion process of C-O-H groups. Both S load and discharging/charging process can effectively regulate evolution of three valence bonds, which is conducive to improving rate performance of lithium-sulfur batteries. (C) 2020 Elsevier Ltd. All rights reserved.

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