In Situ X-ray Diffraction Studies of (De)lithiation Mechanism in Silicon Nanowire Anodes

Sumohan Misra, Nian Liu, Johanna Nelson, Seung Sae Hong, Yi Cui, Michael F. Toney

Research output: Contribution to journalArticlepeer-review

121 Scopus citations

Abstract

Figure Persented: Silicon is a promising anode material for Li-ion batteries due to its high theoretical specific capacity. From previous work, silicon nanowires (SiNWs) are known to undergo amorphorization during lithiation, and no crystalline Li-Si product has been observed. In this work, we use an X-ray transparent battery cell to perform in situ synchrotron X-ray diffraction on SiNWs in real time during electrochemical cycling. At deep lithiation voltages the known metastable Li 15Si 4 phase forms, and we show that avoiding the formation of this phase, by modifying the SiNW growth temperature, improves the cycling performance of SiNW anodes. Our results provide insight on the (de)lithiation mechanism and a correlation between phase evolution and electrochemical performance for SiNW anodes. © 2012 American Chemical Society.
Original languageEnglish (US)
Pages (from-to)5465-5473
Number of pages9
JournalACS Nano
Volume6
Issue number6
DOIs
StatePublished - May 10 2012
Externally publishedYes

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