Few-layer graphene coated current collector for safe and powerful lithium ion battery

Title
Few-layer graphene coated current collector for safe and powerful lithium ion battery
Authors
양철민김창효김소연위재형Young Il SongByung Wook AhnJung Woo LeeSu Jeong ShuMauricio TerronesYoong Ahm Kim
Keywords
LiCoO2 cathode; Internal resistance; Anti-corrosion; Al current collectors; Graphene; Chemical vapor deposition; Li-ion batteries
Issue Date
2019-11
Publisher
Carbon
Citation
VOL 153-503
Abstract
In the fabrication of safe, but powerful lithium ion batteries (LIBs), graphene-related materials are being actively examined in order to meet the demand for applications such as electric vehicles and smart grids. However, most of this work has focused on liquid-phase exfoliated graphene and reduced graphene oxide. Herein, we demonstrate a simple, but effective route for significantly improving the electrochemical performance of currently available LIBs by coupling current collector with catalytically grown large-area graphene. When coating current collectors with large-area three-layered graphene, a reduction in the internal resistance (or effective electron transfer) between the current collector and active materials was observed. The graphene also protected the underlying collector from corrosion, greatly improving the power capability and cyclability of LIBs. The three-layered graphene provided the best electrochemical performance and corrosion resistance because of its high electrical conductivity and mechanical stability during the transfer process. We believe that our approach using interfacial graphene coating can be used with all kinds of electrochemical energy-storage systems, in which high corrosion resistance, electrical conductivity, and flexibility are critical.
URI
http://pubs.kist.re.kr/handle/201004/69641
ISSN
0008-6223
Appears in Collections:
KIST Publication > Article
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