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Interface and Morphology Engineered Amorphous Si for Ultrafast Electrochemical Lithium Storage
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SYSNO ASEP 0583587 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title Interface and Morphology Engineered Amorphous Si for Ultrafast Electrochemical Lithium Storage Author(s) Farjana, Jaishmin Sonia (UFCH-W) ORCID, RID
Haider, Golam (UFCH-W) ORCID, RID
Ghosh, S. (ES)
Müller, Martin (FZU-D) RID, ORCID
Volochanskyi, Oleksandr (UFCH-W) ORCID, SAI
Bouša, Milan (UFCH-W) RID, ORCID
Plšek, Jan (UFCH-W) RID, ORCID
Kamruddin, M. (IN)
Fejfar, Antonín (FZU-D) RID, ORCID, SAI
Kalbáč, Martin (UFCH-W) RID, ORCID
Frank, Otakar (UFCH-W) RID, ORCIDArticle number 2311250 Source Title Small. - : Wiley - ISSN 1613-6810
(2024)Number of pages 10 s. Language eng - English Country US - United States Keywords amorphous Si ; stress management ; Lithium-ion batteries Subject RIV CF - Physical ; Theoretical Chemistry OECD category Physical chemistry Subject RIV - cooperation Institute of Physics - Solid Matter Physics ; Magnetism R&D Projects GA21-09830S GA ČR - Czech Science Foundation (CSF) EF16_026/0008382 GA MŠMT - Ministry of Education, Youth and Sports (MEYS) Research Infrastructure CzechNanoLab II - 90251 - Vysoké učení technické v Brně / Středoevropský technologický institut Method of publishing Open access Institutional support UFCH-W - RVO:61388955 ; FZU-D - RVO:68378271 UT WOS 001174197000001 EID SCOPUS 85186401207 DOI 10.1002/smll.202311250 Annotation Ultrafast high-capacity lithium-ion batteries are extremely desirable for portable electronic devices, where Si is the most promising alternative to the conventional graphite anode due to its very high theoretical capacity. However, the low electronic conductivity and poor Li-diffusivity limit its rate capability. Moreover, high volume expansion/contraction upon Li-intake/uptake causes severe pulverization of the electrode, leading to drastic capacity fading. Here, interface and morphology-engineered amorphous Si matrix is being reported utilizing a few-layer vertical graphene (VG) buffer layer to retain high capacity at both slow and fast (dis)charging rates. The flexible mechanical support of VG due to the van-der-Waals interaction between the graphene layers, the weak adhesion between Si and graphene, and the highly porous geometry mitigated stress, while the three-dimensional mass loading enhanced specific capacity. Additionally, the high electronic conductivity of VG boosted rate-capability, resulting in a reversible gravimetric capacity of ≈1270 mAh g−1 (areal capacity of ≈37 µAh cm−2) even after 100 cycles at an ultrafast cycling rate of 20C, which provides a fascinating way for conductivity and stress management to obtain high-performance storage devices.
Workplace J. Heyrovsky Institute of Physical Chemistry Contact Michaela Knapová, michaela.knapova@jh-inst.cas.cz, Tel.: 266 053 196 Year of Publishing 2025 Electronic address https://onlinelibrary.wiley.com/doi/10.1002/smll.202311250
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