TY - JOUR
T1 - A polymerized C60 coating enhancing interfacial stability at three-dimensional LiCoO2 in high-potential regime
AU - Hudaya, Chairul
AU - Halim, Martin
AU - Pröll, Johannes
AU - Besser, Heino
AU - Choi, Wonchang
AU - Pfleging, Wilhelm
AU - Seifert, Hans Jürgen
AU - Lee, Joong Kee
N1 - Funding Information:
This work was supported by KIST institutional program and research grants of NRF ( NRF-2012M1A2A2671792 ) funded by the National Research Foundation under the Ministry of Science, ICT & Future , Korea. The authors thank Mr. Joo Man Woo and Mr. Un Seok Kim for technical discussion during preparation of this study. Furthermore, we thank the financial support by the German Federal Ministry of Education and Research (BMBF) in frame of the Korea-Germany Mobility Programme ( 01DR14018 )). Finally, the support for laser processing (Dr. Robert Kohler) and thin film deposition (Dr. Harald Leiste) by the Karlsruhe Nano Micro Facility (KNMF, http://www.knmf.kit.edu/ ) a Helmholtz research infrastructure at the Karlsruhe Institute of Technology (KIT) is gratefully acknowledged.
Publisher Copyright:
© 2015 Elsevier B.V. All rights reserved.
PY - 2015/8/24
Y1 - 2015/8/24
N2 - The interfacial instabilities, including side reactions due to electrolyte decompositions and Cobalt (Co) dissolutions, are the main detrimental processes at LiCoO2 cathode when a high-voltage window (>4.2 V) is applied. Nevertheless, cycling the cathode with a voltage above 4.2 V would deliver an increased gravimetric capacity, which is desired for high power battery operation. To address these drawbacks, we demonstrate a synergistic approach by manufacturing the three-dimensional high-temperature LiCoO2 electrodes (3D HT-LCO) using laser-microstructuring, laser-annealing and subsequent coating with polymerized C60 thin films (C60@3D HT-LCO) by plasma-assisted thermal evaporation. The C60@3D HT-LCO cathode delivers higher initial discharge capacity compared to its theoretical value, i.e. 175 mA h g-1 at 0.1 C with cut-off voltage of 3.0-4.5 V. This cathode combines the advantages of the 3D electrode architecture and an advanced C60 coating/passivation concept leading to an improved electrochemical performance, due to an increased active surface area, a decreased charge transfer resistance, a prevented Co dissolution into the electrolyte and a suppressed side reaction and electrolyte decomposition. This work provides a novel solution for other cathode materials having similar concerns in high potential regimes for application in lithium-ion microbatteries.
AB - The interfacial instabilities, including side reactions due to electrolyte decompositions and Cobalt (Co) dissolutions, are the main detrimental processes at LiCoO2 cathode when a high-voltage window (>4.2 V) is applied. Nevertheless, cycling the cathode with a voltage above 4.2 V would deliver an increased gravimetric capacity, which is desired for high power battery operation. To address these drawbacks, we demonstrate a synergistic approach by manufacturing the three-dimensional high-temperature LiCoO2 electrodes (3D HT-LCO) using laser-microstructuring, laser-annealing and subsequent coating with polymerized C60 thin films (C60@3D HT-LCO) by plasma-assisted thermal evaporation. The C60@3D HT-LCO cathode delivers higher initial discharge capacity compared to its theoretical value, i.e. 175 mA h g-1 at 0.1 C with cut-off voltage of 3.0-4.5 V. This cathode combines the advantages of the 3D electrode architecture and an advanced C60 coating/passivation concept leading to an improved electrochemical performance, due to an increased active surface area, a decreased charge transfer resistance, a prevented Co dissolution into the electrolyte and a suppressed side reaction and electrolyte decomposition. This work provides a novel solution for other cathode materials having similar concerns in high potential regimes for application in lithium-ion microbatteries.
KW - Co dissolutions
KW - High-voltage window
KW - Interfacial kinetics
KW - Laser structuring/annealing
KW - Polymerized C coating films
KW - Three-dimensional LiCoO
UR - http://www.scopus.com/inward/record.url?scp=84939810450&partnerID=8YFLogxK
U2 - 10.1016/j.jpowsour.2015.08.044
DO - 10.1016/j.jpowsour.2015.08.044
M3 - Article
AN - SCOPUS:84939810450
SN - 0378-7753
VL - 298
SP - 1
EP - 7
JO - Journal of Power Sources
JF - Journal of Power Sources
ER -