One-Step In Situ Preparation of Polymeric Selenium Sulfide Composite as a Cathode Material for Enhanced Sodium/Potassium Storage

ACS Applied Materials & Interfaces
Wenchao ZhangJianzhong Xu

Abstract

Alkali metal-sulfur/selenium batteries have attracted much attention because they offer promising high energy density. However, the shuttle effect of the polysulfide dissolutions, poor electrical conductivity, and relatively large volume variations greatly hinder their potential applications. Herein, a novel organic carbon/selenium sulfide (OC/SeS2) composite has been prepared by a one-step in situ method by heating the mixture of commercial polyacrylonitrile (PAN) with selenium sulfide powder in vacuum. The carbonized PAN matrix with an N-doped carbon ring structure could effectively confine SeS2 in the form of small molecules and regulate its electronic structure. The superior sodium/potassium storage performance of the OC/SeS2 composite electrodes stems from their rational chemical structure design, including high electrical conductivity of the N-doped organic carbon network and chemical binding with SeS2 molecules. As a result, the OC/SeS2 cathode delivers a reversible capacity of 416 mAh g-1 after 700 cycles for sodium-ion batteries and 216 mAh g-1 after 500 cycles for potassium-ion batteries at 0.5 A g-1, respectively. These findings could open a new window to develop selenium sulfide cathode for metal-sulfur/selenium bat...Continue Reading

References

Dec 16, 2011·Nature Materials·Peter G BruceJean-Marie Tarascon
Mar 1, 2012·Journal of the American Chemical Society·Ali AbouimraneKhalil Amine
Jun 28, 2013·Angewandte Chemie·Chun-Peng YangYu-Guo Guo
Sep 2, 2015·Journal of the American Chemical Society·Shuya WeiLynden A Archer
Feb 18, 2017·Journal of the American Chemical Society·Wenchao ZhangZaiping Guo
Feb 14, 2018·Chemical Communications : Chem Comm·Yu LiuYuping Wu
Aug 2, 2018·Journal of the American Chemical Society·Qingli ZouYi-Chun Lu

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