Improvement of long-term cycling performance of Li[Ni0.8Co0.15Al0.05]O-2 by AlF3 coating

Title
Improvement of long-term cycling performance of Li[Ni0.8Co0.15Al0.05]O-2 by AlF3 coating
Author
선양국
Keywords
Layered materials; Cathode materials; Dry coating; Lithium-ion batteries; LITHIUM SECONDARY BATTERIES; LI-ION BATTERIES; CATHODE MATERIALS; ELECTROCHEMICAL PROPERTIES; LINI0.8CO0.15AL0.05O2 CATHODES; ELEVATED-TEMPERATURE; LICOO2 CATHODE; COPRECIPITATION; CELLS
Issue Date
2013-07
Publisher
ELSEVIER SCIENCE BV, PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS
Citation
Journal of Power Sources,2013,234,p201-207
Abstract
The surface of a Li[Ni0.8Co0.15Al0.05]O-2 cathode material was coated by a 50-nm thick AlF3 layer using a simple dry coating process. Although the initial discharge capacity of pristine and AlF3-coated Li [Ni0.8Co0.15Al0.05]O-2 was nearly same, the AlF3-coating significantly improved the electrochemical performances of [Ni0.8Co0.15Al0.05]O-2 in a full cell configuration (graphite anode), especially at an elevated temperature (55 degrees C). Furthermore, the AlF3-coated [Ni0.8Co0.15Al0.05]O-2 had better thermal stability than the pristine electrode. The improved electrochemical performance likely arose from the AlF3 coating layer which may have retarded the transition metal dissolution from HF attack. Electrochemical impedance spectroscopy and transmission electron microscopy provided direct evidence that the AlF3 coating layer suppressed the increase in charge transfer resistance and cathode material pulverization during cycling. Published by Elsevier B.V.
URI
http://www.sciencedirect.com/science/article/pii/S0378775313000827?via%3Dihubhttp://hdl.handle.net/20.500.11754/44203
ISSN
0378-7753
DOI
10.1016/j.jpowsour.2013.01.045
Appears in Collections:
COLLEGE OF ENGINEERING[S](공과대학) > ENERGY ENGINEERING(에너지공학과) > Articles
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