Synergistic Effects of a Multifunctional Graphene Based Interlayer on Electrochemical Behavior and Structural Stability.
The ability to rationally design and manipulate the interfacial structure in lithium ion batteries (LIBs) is of utmost technological importance for achieving desired performance requirements as it provides synergistic effects to the electrochemical properties and cycling stability of electrode materials. However, despite considerable efforts and progress made in recent years through the interface engineering based on active electrode materials, relatively little attention has been devoted to address the physical aspects of the interface and interfacial layer between the anode materials layer and the current collector. Here, we propose and successfully grow unique graphene directly on a Cu current collector as an ideal interfacial layer using the modified chemical vapor deposition (CVD). The anode with an engineered graphene interlayer exhibits remarkably improved electrochemical performances, such as large reversible specific capacity (921.4 mAh g(-1) at current density of 200 mA g(-1)), excellent Coulombic efficiency (close to approximately 96%), and superior cycling capacity retention and rate properties compared to the bare Cu. These excellent electrochemical features are discussed in terms of multiple beneficial effects of graphene on interfacial stability and adhesion between the anode and the collector, oxidation or corrosion resistance of the graphene grown Cu current collector, and electrical contact conductance during the charge/discharge process.
Department of Engineering Science, University of Oxford , Oxford OX1 3PJ, U.K.
Young-Woo
YW
Lee
Department of Materials Science and Engineering, Seoul National University of Science and Technology , Seoul 139-743, Republic of Korea.
Geon-Hyoung
GH
An
Department of Engineering Science, University of Oxford , Oxford OX1 3PJ, U.K.
Byung-Sung
BS
Kim
Department of Engineering Science, University of Oxford , Oxford OX1 3PJ, U.K.
John
J
Hong
Department of Engineering Science, University of Oxford , Oxford OX1 3PJ, U.K.
Sangyeon
S
Pak
Department of Materials Science and Engineering, Seoul National University of Science and Technology , Seoul 139-743, Republic of Korea.
Eun-Hwan
EH
Lee
Department of Engineering Science, University of Oxford , Oxford OX1 3PJ, U.K.
Yuljae
Y
Cho
Department of Engineering Science, University of Oxford , Oxford OX1 3PJ, U.K.
Juwon
J
Lee
Department of Engineering Science, University of Oxford , Oxford OX1 3PJ, U.K.
Paul
P
Giraud
Department of Engineering Science, University of Oxford , Oxford OX1 3PJ, U.K.
Seung Nam
SN
Cha
Department of Materials Science and Engineering, Seoul National University of Science and Technology , Seoul 139-743, Republic of Korea.
Hyo-Jin
HJ
Ahn
Department of Engineering Science, University of Oxford , Oxford OX1 3PJ, U.K.
Jung Inn
JI
Sohn
Department of Engineering Science, University of Oxford , Oxford OX1 3PJ, U.K.
Jong Min
JM
Kim
2D interlayer; electrochemical behavior; energy storage; graphene; interface engineering; structural stability