Thickness-dependent fracture of amorphous carbon coating on SnO2nanowire electrodes

Qianqian Li, Weiqun Li, Qiong Feng, Peng Wang, Minmin Mao, Jiabin Liu, Li Min Zhou, Hongtao Wang, Haimin Yao

Research output: Journal article publicationJournal articleAcademic researchpeer-review

28 Citations (Scopus)

Abstract

Carbon-coated SnO2nanowires (NWs) were fabricated and applied as electrode to study the lithiation process using in situ transmission electron microscopy. A critical coating thickness (9 nm) was found, above which the carbon coating is able to constrain the lithiation- induced expansion of SnO2core without failure. Theoretical modeling and numerical simulation were performed and revealed that such thickness-dependent fracture can be attributed to the thickness-dependent maximum stress developed in the carbon coating during the lithiation of SnO2core. Our work provides direct evidence of the mechanical robustness of thick carbon coating and offers a minimum thickness of carbon coating for constraining the deformation of anode materials with large lithiation-induced volume change.
Original languageEnglish
Pages (from-to)793-798
Number of pages6
JournalCarbon
Volume80
Issue number1
DOIs
Publication statusPublished - 1 Jan 2014

ASJC Scopus subject areas

  • Chemistry(all)

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