Olivine LiCoPO4-carbon composite showing high rechargeable capacity

Title
Olivine LiCoPO4-carbon composite showing high rechargeable capacity
Author
선양국
Keywords
LITHIUM BATTERIES; CATHODE MATERIAL; HIGH-PERFORMANCE; LIMNPO4
Issue Date
2012-07
Publisher
ROYAL SOC CHEMISTRY, THOMAS GRAHAM HOUSE, SCIENCE PARK, MILTON RD, CAMBRIDGE CB4 0WF, CAMBS, ENGLAND
Citation
Electrochimica Acta, Volume 75, 30, Pages 123-130
Abstract
A LiCoPO4 positive electrode material with an extremely high discharge capacity, 145 mA h (g-phosphate)(-1), is reported. Seeking high capacity, we examined three kinds of precursors, Co3O4, Co-3(PO4)(2)center dot 2H(2)O, and NH4CoPO4 center dot H2O. In combination with a thermal gravimetric study, we found that simple the dehydration of the first two precursors is related to the formation of LiCoPO4-acetylene black carbon composites (hereafter referred as C-LiCoPO4). Meanwhile, the formation of the C-LiCoPO4 composite is somewhat different. That is, generation of NH3 gas and dehydration of the NH4CoPO4 center dot H2O precursor occurs spontaneously, and the NH3, which decomposes to N-2 and H-2 gases, provides a more reductive environment during calcination, leaving a small quantity of metallic Co nanoparticles (<10 nm). Distribution of the added acetylene black carbon network is important for proper electron transfer, resulting in good rate capability and capacity retention at 25 degrees C and 55 degrees C, which has never been reported.
URI
http://www.sciencedirect.com/science/article/pii/S0013468612006512?via%3Dihubhttp://hdl.handle.net/20.500.11754/40091
ISSN
0013-4686
DOI
10.1016/j.electacta.2012.04.082
Appears in Collections:
COLLEGE OF ENGINEERING[S](공과대학) > ENERGY ENGINEERING(에너지공학과) > Articles
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