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Graphene-Coated Aluminum Thin Film Anodes for Lithium-Ion Batteries

Authors :
Kwon, Gi Duk
Moyen, Eric
Lee, Yeo Jin
Joe, Jemee
Pribat, Didier
Source :
ACS Applied Materials & Interfaces; August 2018, Vol. 10 Issue: 35 p29486-29495, 10p
Publication Year :
2018

Abstract

We present a detailed study on graphene-coated aluminum thin films for Li-ion battery anode applications. The best electrode ageing behavior is obtained for Al films encapsulated with four porous graphene layers. Graphene encapsulation prevents “crushed” Al nanoparticles from detaching from the anode, thus allowing prolonged charge–discharge cycling. Graphene also provides surface conduction paths for electrons as well as diffusion paths for Li atoms. For the first time, we report the electrochemical room temperature formation of phases such as Li3Al2and even Li9Al4, with a higher Li content than β-LiAl. More interestingly, we observe a progressive change of the composite thin film electrode, switching from a pure galvanic to a pseudocapacitive behavior as the size of the Al grains decreases from ∼100 to 5–10 nm due to repeated Li alloying-dealloying. The capacity values of ∼900 and 780 mAh/g are obtained after, respectively, 500 and 1000 charge–discharge cycles at 0.1C. Our results may refocus the interest of the battery community on Al-based thin film anodes, since they are potentially very simple to fabricate, particularly if porous graphene is replaced in the future by reduced graphite oxide.

Details

Language :
English
ISSN :
19448244
Volume :
10
Issue :
35
Database :
Supplemental Index
Journal :
ACS Applied Materials & Interfaces
Publication Type :
Periodical
Accession number :
ejs46181827
Full Text :
https://doi.org/10.1021/acsami.8b08358