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 - 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 -