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V-Doped CoSe2Nanowire Catalysts in a 3D-Structured Electrode for Durable Li–S Pouch Cells
- Source :
- ACS Applied Materials & Interfaces; July 2024, Vol. 16 Issue: 27 p35123-35133, 11p
- Publication Year :
- 2024
-
Abstract
- Lithium–sulfur (Li–S) batteries have high theoretical energy density and are regarded as a promising candidate for next-generation energy storage systems. However, their practical applications are hindered by the slow kinetics of sulfur conversion and polysulfide shuttling. In particular, large-scale pouch cells show much poor cyclability. Here, we develop a high-efficiency catalyst of V-doped CoSe2by studying the binary CoSe2–VSe2system and confirming its effectiveness in accelerating polysulfide conversion. The coin cell tests reveal an initial capacity of 1414 mAh g–1at 0.1 C and 1049 mAh g–1at 1 C and demonstrate 1000 times cyclability with a decaying rate of 0.05% per cycle. Furthermore, the assembly and construction of pouch cells were optimized with monolithic three-dimensional (3D) electrodes and a multistacking strategy. Specifically, a 3D metallic scaffold (3MS) was developed to host V-doped CoSe2nanowires and sulfur. In addition, Janus microspheres of C@TiO2were synthesized to capture polar polysulfides with their polar part of TiO2and adsorb nonpolar sulfur with their nonpolar part of carbon. By integrating with 3MS, C@TiO2microspheres can block all ion channels of 3MS and only allow Li ions in and out. These integral designs and monolithic structures enable multistacking pouch cells with high cyclability. A high-loading pouch cell was demonstrated with a total capacity of 700 mAh. The cell can be cycled for 70 times with a capacity retention of 65.7%. In brief, this work provides an integral strategy of catalyst design and overall 3D assembly for practical Li–S batteries in a large pouch cell format.
Details
- Language :
- English
- ISSN :
- 19448244
- Volume :
- 16
- Issue :
- 27
- Database :
- Supplemental Index
- Journal :
- ACS Applied Materials & Interfaces
- Publication Type :
- Periodical
- Accession number :
- ejs66735383
- Full Text :
- https://doi.org/10.1021/acsami.4c05577