Is Soft Carbon a More Suitable Match for SiOx in Li-Ion Battery Anodes?
Sun, Qing (Harbin Institute of Technology)
Zeng, Guifang (Universitat de Barcelona. Departament d'Enginyeria Electrònica i Biomèdica)
Li, Jing (Harbin Institute of Technology)
Wang, Shang (Harbin Institute of Technology)
Botifoll, Marc (Institut Català de Nanociència i Nanotecnologia)
Wang, Hao (Land Transport Authority of Singapore)
Li, Deping (Harbin Institute of Technology)
Ji, Fengjun (Harbin Institute of Technology)
Cheng, Jun (Harbin Institute of Technology)
Shao, Huaiyu (University of Macau. Institute of Applied Physics and Materials Engineering)
Tian, Yanhong (Harbin Institute of Technology)
Arbiol i Cobos, Jordi (Institut Català de Nanociència i Nanotecnologia)
Cabot i Codina, Andreu (Institució Catalana de Recerca i Estudis Avançats)
Ci, Lijie (Shandong University)

Data:	2023
Resum:	Silicon oxide (SiOx), inheriting the high-capacity characteristic of silicon-based materials but possessing superior cycling stability, is a promising anode material for next-generation Li-ion batteries. SiOx is typically applied in combination with graphite (Gr), but the limited cycling durability of the SiOx/Gr composites curtails large-scale applications. In this work, this limited durability is demonstrated in part related to the presence of a bidirectional diffusion at the SiOx/Gr interface, which is driven by their intrinsic working potential differences and the concentration gradients. When Li on the Li-rich surface of SiOx is captured by Gr, the SiOx surface shrinks, hindering further lithiation. The use of soft carbon (SC) instead of Gr can prevent such instability is further demonstrated. The higher working potential of SC avoids bidirectional diffusion and surface compression thus allowing further lithiation. In this scenario, the evolution of the Li concentration gradient in SiOx conforms to its spontaneous lithiation process, benefiting the electrochemical performance. These results highlight the focus on the working potential of carbon as a strategy for rational optimization of SiOx/C composites toward improved battery performance.
Ajuts:	Agencia Estatal de Investigación PID2020-116093RB-C43 Agència de Gestió d'Ajuts Universitaris i de Recerca 2017/SGR-327 Ministerio de Ciencia e Innovación CEX2021-001214-S
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Llengua:	Anglès
Document:	Article ; recerca ; Versió sotmesa a revisió
Matèria:	Lithium-ion batteries ; SiOx/C anode ; Working potential match ; Operando X-ray diffraction
Publicat a:	Small (Weinheim), Vol. 19, Issue 37 (September 2023) , art. 2302644, ISSN 1613-6829

DOI: 10.1002/smll.202302644

Preprint 19 p, 1.7 MB

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