Mechanically and structurally stable Sb2Se3/carbon nanocomposite as anode for the lithium-ion batteries

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review

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Detail(s)

Original languageEnglish
Article number159859
Journal / PublicationJournal of Alloys and Compounds
Volume874
Online published9 Apr 2021
Publication statusPublished - 5 Sep 2021

Abstract

Metal chalcogenides undergoing alloying and conversion mechanism can give high capacity as anode for lithium-ion batteries. However, large volume change and phase segregation lead to poor cycle performance. In this study, we focus on Sb2Se3 and develop methods to enhance its long-term stability and reversibility. In particular, we find that carbon encapsulation reduces volume change during lithiation/delithiation and facilitates the recombination process of Sb and Se even after long cycling. With an addition of 20 wt% acetylene black, the Sb2Se3/C nanocomposite material exhibits an excellent cycle performance with a charge capacity of 545 mAh g−1 at 250 mA g−1 after 1000 cycles, corresponding to a capacity retention of 99.3%. We also demonstrate a full cell with LiFePO4 cathode and Sb2Se3/C anode that is capable of delivering a stable capacity of 340 mAh g−1 at 1 A g−1 (about 3 C rate) after 300 cycles.

Research Area(s)

  • Alloying/conversion, Carbon encapsulation, Lithium-ion batteries, Nanocomposite, Sb2Se3 anode