Amorphous TiO2 shells: A vital elastic buffering layer on silicon nanoparticles for high-performance and safe lithium storage

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Yang, J
Wang, Y
Li, W
Wang, L
Fan, Y
Jiang, W
Luo, W
Wang, Y
Kong, B
Selomulya, C
Liu, HK
Dou, SX
Zhao, D
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2017
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Abstract

Smart surface coatings of silicon (Si) nanoparticles are shown to be good examples for dramatically improving the cyclability of lithium-ion batteries. Most coating materials, however, face significant challenges, including a low initial Coulombic efficiency, tedious processing, and safety assessment. In this study, a facile sol–gel strategy is demonstrated to synthesize commercial Si nanoparticles encapsulated by amorphous titanium oxide (TiO2), with core–shell structures, which show greatly superior electrochemical performance and high-safety lithium storage. The amorphous TiO2 shell (≈3 nm) shows elastic behavior during lithium discharging and charging processes, maintaining high structural integrity. Interestingly, it is found that the amorphous TiO2 shells offer superior buffering properties compared to crystalline TiO2 layers for unprecedented cycling stability. Moreover, accelerating rate calorimetry testing reveals that the TiO2-encapsulated Si nanoparticles are safer than conventional carbon-coated Si-based anodes.

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Advanced Materials

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29

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48

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© 2017 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim. This is the peer reviewed version of the following article: Amorphous TiO2 shells: A vital elastic buffering layer on silicon nanoparticles for high-performance and safe lithium storage, Advanced Materials, 2017, 29 (48), pp. 1700523, which has been published in final form at https://doi.org/10.1002/adma.201700523. This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for Use of Self-Archived Versions. This article may not be enhanced, enriched or otherwise transformed into a derivative work, without express permission from Wiley or by statutory rights under applicable legislation. Copyright notices must not be removed, obscured or modified. The article must be linked to Wiley’s version of record on Wiley Online Library and any embedding, framing or otherwise making available the article or pages thereof by third parties from platforms, services and websites other than Wiley Online Library must be prohibited.

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Physical sciences

Chemical sciences

Engineering

core-shell structures

lithium-ion batteries

silicon nanoparticles

sol-gel coatings

titanium oxide

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Yang, J; Wang, Y; Li, W; Wang, L; Fan, Y; Jiang, W; Luo, W; Wang, Y; Kong, B; Selomulya, C; Liu, HK; Dou, SX; Zhao, D, Amorphous TiO2 shells: A vital elastic buffering layer on silicon nanoparticles for high-performance and safe lithium storage, Advanced Materials, 2017, 29 (48), pp. 1700523

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