Enhanced electrochemical performance of carbon-LiMn(1-x)Fe(x)PO(4) nanocomposite cathode for lithium-ion batteries

Title
Enhanced electrochemical performance of carbon-LiMn(1-x)Fe(x)PO(4) nanocomposite cathode for lithium-ion batteries
Author
선양국
Keywords
Carbon coating; Olivine; Iron doping; Nanocomposite; Lithium battery
Issue Date
2011-08
Publisher
ELSEVIER SCIENCE BV, PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS
Citation
JOURNAL OF POWER SOURCES, 권: 196, 호: 16, 페이지: 6924-6928
Abstract
4V-class olivine C-LiMn1-xFexPO4 (x = 0 and 0.15) are synthesized by ultrasonic pyrolysis followed by ball milling with AB carbon to evaluate the doping effect of iron. The C-LiMn0.85Fe0.15PO4 shows excellent rate capability having discharge capacity of 150 mAh g(-1) at 0.5C-rate and 121 mAh g(-1) at 2C-rate. The capacity retention of the C-LiMn0.85Fe0.15PO4 is 91% after 50 cycles at 55 degrees C whereas C-LiMnPO4 is limited to 87%. The improved electrochemical performance of the C-LiMn0.85Fe0.15PO4 electrode is attributed to the enhanced electrical conductivity caused by tighter binding on the carbon particles with the LiMn0.85Fe0.15PO4 primary particles as well as by the surface coating of carbon on the primary particles. Published by Elsevier B.V.
URI
http://www.sciencedirect.com/science/article/pii/S0378775310021518
ISSN
0378-7753
DOI
10.1016/j.jpowsour.2010.11.159
Appears in Collections:
COLLEGE OF ENGINEERING[S](공과대학) > ENERGY ENGINEERING(에너지공학과) > Articles
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