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Understanding the Li-ion storage mechanism in a carbon composited zinc sulfide electrode

Tian, Guiying; Zhao, Zijian; Sarapulova, Angelina; Das, Chittaranjan; Zhu, Lihua; Liu, Suya; Missiul, Aleksandr; Welter, Edmund; Maibach, Julia; Dsoke, Sonia

Abstract:
Sulfide compounds are interesting conversion electrode materials for Li-ion batteries, due to their high theoretical capacity. However, they suffer from large volumetric changes and fast capacity fading. To overcome these issues, nanosized zinc sulfide (ZnS) modified with polyelectrolytes and graphene (ZnS-C/G) has been synthesized and investigated as an enhanced conversion-alloying anode material. In situ synchrotron X-ray diffraction and X-ray absorption spectroscopy are used to elucidate the Li storage process during the 1st cycle. In addition, the evolution of internal resistance and the corresponding solid electrolyte interphase (SEI) formation during the 1st cycle are discussed based on electrochemical impedance spectroscopy and X-ray photoelectron spectroscopy. The results reveal that the formation of lithiated products and the SEI layer at different voltages can influence Li+ diffusion into the electrode. Moreover, an artificial carbon layer can not only facilitate Li+ transport but also avoid the direct formation of the SEI layer on the surface of active particles. Compared to bare ZnS, the ZnS-C/G electrode shows outstanding rate capability and cycling capacity (571 mA h g−1 after 120 cycles at a specific current of 1.0 A g−1 with a retention rate of 94.4%). ... mehr

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Verlagsausgabe §
DOI: 10.5445/IR/1000093972
Veröffentlicht am 21.10.2019
Coverbild
Zugehörige Institution(en) am KIT Institut für Nanotechnologie (INT)
Institut für Angewandte Materialien - Energiespeichersysteme (IAM-ESS)
Helmholtz-Institut Ulm (HIU)
Publikationstyp Zeitschriftenaufsatz
Jahr 2019
Sprache Englisch
Identifikator ISSN: 2050-7488, 2050-7496
KITopen-ID: 1000093972
HGF-Programm 37.01.01 (POF III, LK 01)
Erschienen in Journal of materials chemistry / A
Band 7
Heft 26
Seiten 15640-15653
Nachgewiesen in Web of Science
Scopus
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