Journal
MATERIALS LETTERS
Volume 355, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.matlet.2023.135525
Keywords
Energy storage and conversion; Mott -Schottky heterojunctions; Porous materials
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In this study, the authors propose a method to accelerate the reaction of polysulfides in lithium-sulfur batteries using a Ni@OC Mott-Schottky heterojunction as a catalyst. The experimental results demonstrate that the charge redistribution at the Ni@OC interface accelerates electron transfer and enhances catalytic activity, leading to improved reaction kinetics and battery performance.
The practical application of lithium-sulfur batteries (LSBs) is hindered by the sluggish redox kinetics of poly-sulfides. The authors propose that a Ni@OC Mott-Schottky heterojunction catalytically accelerates sulfur con-version reactions. The experimental results reveal that benefitting from a self-generated built-in electric field, the charge redistribution at the Ni@OC heterointerface accelerates electron transfer and enhances catalytic activity contributing to the conversion kinetics of polysulfides. Therefore, the cells assembled with Ni@OC hetero-junction display an excellent rate performance (the capacity 640.4 mAh center dot g 1 at 3 C) and a high capacity of 1026.6 mAh center dot g 1 under the lean electrolyte (E/S = 5.0 mu L center dot mg 1) conditions. The proposed Mott-Schottky het-erostructure provides a favorable reference and advanced guidance for high-capacity lithium-sulfur batteries.
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