Evidence of Copper Separation in Lithiated Cu6Sn5 Lithium-Ion Battery Anodes

Xin F. Tan, Wenhui Yang, Kohei Aso, Syo Matsumura, Stuart D. McDonald, Kazuhiro Nogita

Research output: Contribution to journalArticle

Abstract

Intermetallics such as Cu6Sn5, NiSi2, and CuGa2 etc., are promising candidate materials to replace carbon-based lithium-ion battery anodes. However, the lithiation reactions of these anodes often involve the separation of the inactive phases, a slow process that retards the lithiation kinetics and deactivates their role as a stress buffer. This research visualizes the separated Cu in a lithiated Cu6Sn5 anode by advanced transmission electron microscopy techniques. Cu nanospheres of 3-4 nm are found homogeneously distributed in both Li(13+y)Sn5 and Li13Cu6Sn5 phases, suggesting that Cu is transported by long-range diffusion from the reaction site at the Li(13+y)Sn5/Li13Cu6Sn5 phase boundaries.

Original languageEnglish
Pages (from-to)141-145
Number of pages5
JournalACS Applied Energy Materials
Volume3
Issue number1
DOIs
Publication statusPublished - Jan 27 2020

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All Science Journal Classification (ASJC) codes

  • Chemical Engineering (miscellaneous)
  • Energy Engineering and Power Technology
  • Electrochemistry
  • Materials Chemistry
  • Electrical and Electronic Engineering

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