25-27 November 2015
National Centre for Synchrotron Science
Australia/Melbourne timezone

Time-resolved phase evolution during creation of nanoporous Cu current collectors by a dealloying approch

26 Nov 2015, 13:30
Exhibition space (National Centre for Synchrotron Science)

Exhibition space

National Centre for Synchrotron Science

Australian Synchrotron 800 Blackburn Road Clayton VIC 3168
Board: AM-21
Poster Advanced Materials Poster Session 1


Ms Tingting SONG (RMIT University)


Dealloying is used to fabricate nanoporous metals, and is a process where less noble components (e.g. Al) in the precursor (e.g. AlCu) are dissolved, leaving the nobler elements (e.g. Cu) to a nanoporous structure. Nanoporous Cu is desired in lithium-ion batteries as current collectors, which can provide large surface area for active materials. From the perspective of phase evolution, it was reported that only Al-rich phase (e.g. fcc α-Al(Cu), tetragonal Al2Cu) can be dealloyed completely to form fcc Cu, but not Cu-rich phase (e.g. monoclinic AlCu, cubic Al4Cu9) placing limitations in creating nanoporous Cu. To further understand it, we carried out in-situ and ex-situ dealloying experimentation at synchrotron powder diffraction beamline. We selected two two-phase Al-Cu precursors (at.%): Al55Cu45 (Al2Cu and AlCu) and Al45Cu45 (AlCu and Al4Cu9) alloys. The time-resolved phase evolution results showed that, in all three cases, the dealloying of two phases started in sequences with the formation of Cu. The dealloying of the relatively Al-rich phase (e.g. AlCu in Al45Cu55) started preferentially and subsequently it would promote the dealloying of relatively Cu-rich phase (e.g. Al4Cu9 in Al45Cu55). This study improves the understanding of dealloying of AlCu and demonstrates the capability of creating more nanoporous copper via multiphase precursor designing.
Keywords dealloying; nanoporous; in-situ; phase evolution; multi-phase designing

Primary author

Ms Tingting SONG (RMIT University)


Dr Justin Kimpton (Australian Synchrotron) Prof. Ma Qian (RMIT University) Dr Mark Styles (CSIRO Manufacturing Flagship) Dr Ming Yan (South University of Science and Technology of China) Nathan Webster (CSIRO)

Presentation Materials

There are no materials yet.
Your browser is out of date!

Update your browser to view this website correctly. Update my browser now