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Heterostructured CoSe2/Se/hollow carbon spheres as a superior sulfur host for lithium–sulfur batteries.
- Source :
- Journal of Materials Science; Jun2023, Vol. 58 Issue 23, p9605-9617, 13p, 2 Color Photographs, 5 Graphs
- Publication Year :
- 2023
-
Abstract
- Owing to the high energy density, lithium–sulfur batteries (LSBs) have attracted a lot of attention as a representative of new secondary batteries. However, LSBs also face some serious issues in practical applications such as the large volume expansion of S cathode, shuttle effect of lithium polysulfide (LPSs), and dendrite formation of lithium metal anode. In this work, hollow carbon sphere (HCS) was used as a framework, and CoSe<subscript>2</subscript>/Se nanorods were uniformly loaded on the HCS surface to form a 3D heterostructured composite (CS/Se/HCS). When used as an active sulfur host, the HCS is conducive to the transport of electrons and Li<superscript>+</superscript>; meanwhile, it can suppress the large volume expansion in the electrochemical performance. CoSe<subscript>2</subscript> can effectively adsorb LPSs and accelerate the transformation of LPSs. We also investigated the effect of CoSe<subscript>2</subscript>/Se content on the electrochemical performance of the S electrode. Among different CS/Se/HCS samples, the CS/Se/HCS-0.3/S electrode exhibited the best electrochemical performance; at 1C rate, after 500 cycles, it presents a reversible capacity of 511 mA h g<superscript>−1</superscript>. This work provided a new idea for the combination of transition metal selenide and carbon materials, which can be used in LSBs and other energy storage devices. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 00222461
- Volume :
- 58
- Issue :
- 23
- Database :
- Complementary Index
- Journal :
- Journal of Materials Science
- Publication Type :
- Academic Journal
- Accession number :
- 164263506
- Full Text :
- https://doi.org/10.1007/s10853-023-08631-z