Synthesis and enhanced electrochemical performance of Li2CoPO4F cathodes under high current cycling

Title
Synthesis and enhanced electrochemical performance of Li2CoPO4F cathodes under high current cycling
Authors
S. AmareshG. J. KimK. KarthikeyanV. Aravindan정경윤조병원이윤성
Keywords
Li2CoPO4F; cathode; lithium secondary batteries
Issue Date
2012-09
Publisher
Physical chemistry chemical physics : PCCP
Citation
VOL 14, NO 34, 11904-11909
Abstract
Lithium cobalt fluorophosphate, Li2CoPO4F, is successfully synthesized by a solid state reaction under Ar flow at 700 ℃. X-ray diffraction and scanning electron microscopic studies are utilized to analyze the structural and morphological features of the synthesized materials, respectively. The presence of fluorine is also supported by energy-dispersive X-ray spectroscopy. The electrochemical properties are evaluated by means of Li/Li2CoPO4F half-cell configurations in both potentiostatic and galvanostatic modes. The Li/Li2CoPO4F cell delivers an initial discharge capacity of 132 mA h g-1 at a current density of 0.1 mA cm-2 between 2.0 and 5.1 V at room temperature. Due to the higher operating potential of the Co2+/3+ couple in the fluorophosphate matrix, this cell shows a capacity retention of only 53% after 20 cycles, still the material delivered 108 mA h g-1 at a high current rate of 1 C. Cyclic voltammetric studies corroborate the insertion and extraction of Li+ ions by a single phase reaction mechanism during cycling.
URI
http://pubs.kist.re.kr/handle/201004/44112
ISSN
14639076
Appears in Collections:
KIST Publication > Article
Files in This Item:
There are no files associated with this item.
Export
RIS (EndNote)
XLS (Excel)
XML


qrcode

Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.

BROWSE