Effect of Lithiation on the Microstructure of a Cobalt Foam Processed by Freeze Casting

Jenő Gubicza, Regina Németh, Hyeji Park, Kyungbae Kim, Jae Hun Kim, Mihály Óvári, Miklós Mohai, Heeman Choe

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

Surface-oxidized Co is a promising candidate as a negative electrode material in lithium ion batteries (LIBs). The stability of electrode materials in LIBs during charging/discharging is crucial from the viewpoint of their applications. In this study, experiments are carried out to investigate the influence of lithiation on the microstructure of Co foam processed by freeze casting. The main phase in the strut interiors of the as-prepared foam was hcp-Co with a grain size of ≈0.38 µm and a considerable lattice strain. Thirty cycles of charging/discharging caused no changes in the phase composition, the grain size, and microstrain in the struts. However, the crystalline surface oxide layer is practically amorphized and a strong oxygen/cobalt ratio gradient developed during lithiation; additionally, the foam is enriched with Li. These changes led to a fragmentation of the surface into scutes.

Original languageEnglish
Article number1800343
JournalAdvanced Engineering Materials
Volume20
Issue number10
DOIs
Publication statusPublished - Oct 2018

Keywords

  • amorphization
  • cobalt foam
  • freeze casting
  • lithium-ion battery
  • surface oxide layer

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics

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