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Kinked silicon nanowires-enabled interweaving electrode configuration for lithium-ion batteries

Sandu, Georgiana, Coulombier, Michael, Kumar, Vishank, Kassa, Hailu G., Avram, Ionel, Ye, Ran, Stopin, Antoine, Bonifazi, Davide ORCID:, Gohy, Jean-François, Leclère, Philippe, Gonze, Xavier, Pardoen, Thomas, Vlad, Alexandru and Melinte, Sorin 2018. Kinked silicon nanowires-enabled interweaving electrode configuration for lithium-ion batteries. Scientific Reports 8 (1) , 9794. 10.1038/s41598-018-28108-3

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A tri-dimensional interweaving kinked silicon nanowires (k-SiNWs) assembly, with a Ni current collector co-integrated, is evaluated as electrode configuration for lithium ion batteries. The large-scale fabrication of k-SiNWs is based on a procedure for continuous metal assisted chemical etching of Si, supported by a chemical peeling step that enables the reuse of the Si substrate. The kinks are triggered by a simple, repetitive etch-quench sequence in a HF and H2O2-based etchant. We find that the inter-locking frameworks of k-SiNWs and multi-walled carbon nanotubes exhibit beneficial mechanical properties with a foam-like behavior amplified by the kinks and a suitable porosity for a minimal electrode deformation upon Li insertion. In addition, ionic liquid electrolyte systems associated with the integrated Ni current collector repress the detrimental effects related to the Si-Li alloying reaction, enabling high cycling stability with 80% capacity retention (1695 mAh/gSi) after 100 cycles. Areal capacities of 2.42 mAh/cm2 (1276 mAh/gelectrode) can be achieved at the maximum evaluated thickness (corresponding to 1.3 mgSi/cm2). This work emphasizes the versatility of the metal assisted chemical etching for the synthesis of advanced Si nanostructures for high performance lithium ion battery electrodes.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Chemistry
Subjects: Q Science > QD Chemistry
Publisher: Nature Publishing Group
ISSN: 2045-2322
Date of First Compliant Deposit: 3 July 2018
Date of Acceptance: 11 June 2018
Last Modified: 06 Jan 2024 04:42

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