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A novel textile-like carbon wrapping for highperformance silicon anodes in lithium-ion batteries
Stockholm University, Faculty of Science, Department of Materials and Environmental Chemistry (MMK).
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Number of Authors: 92018 (English)In: Journal of Materials Chemistry A, ISSN 2050-7488, Vol. 6, no 26, p. 12475-12483Article in journal (Refereed) Published
Abstract [en]

Carbon coating is essential for active materials in electrochemical applications that are often insulators or poor conductors. A conventional conformal carbon coating can hinder the ion diffusion to and from the active material and form an isolated conducting network. Especially, active materials with very large volume expansion, e.g., silicon, can destroy the carbon coating during lithiation, which makes conformal carbon coating inappropriate. This paper presents a novel textile-like carbon wrapping that provides efficient electron and ion diffusion paths via a wide-range carbon network and pores. The textile-like carbon wrapping can reduce the electrical contact loss during cycling through the wide-range carbon network, which makes it a suitable carbon coating for materials that undergo volume expansion. A textile-like carbon-wrapped silicon is formed by pyrolysis of a dried suspension of silicon nanoparticles mixed with enzymatically hydrolyzed cellulose nanofibers. It shows excellent electrochemical performance compared to a conformal carbon-coated silicon. It exhibits a reversible specific capacity of 680mA h g(-1) at 8.0 A g(-1) and shows excellent cycling stability (capacity retention of 94.5% after 500 cycles at 2.0 A g(-1)) with high Si content (95.71 wt%). Therefore, this novel textile-like carbon wrapping can be utilized in many electrochemical applications instead of the conventional carbon coating, especially for active materials that undergo large volume expansion.

Place, publisher, year, edition, pages
2018. Vol. 6, no 26, p. 12475-12483
National Category
Chemical Sciences Environmental Engineering Materials Engineering
Identifiers
URN: urn:nbn:se:su:diva-158332DOI: 10.1039/c8ta01414kISI: 000437469300030OAI: oai:DiVA.org:su-158332DiVA, id: diva2:1237373
Available from: 2018-08-08 Created: 2018-08-08 Last updated: 2018-08-08Bibliographically approved

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Guccini, ValentinaSalazar-Alvarez, German
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Department of Materials and Environmental Chemistry (MMK)
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