Journal
JOURNAL OF POWER SOURCES
Volume 240, Issue -, Pages 772-778Publisher
ELSEVIER
DOI: 10.1016/j.jpowsour.2013.04.149
Keywords
Lithium-ion battery; In-situ neutron diffraction; Layered oxide cathode; Graphite anode
Funding
- office of Basic Energy Sciences (BES)
- China Scholarship Council [2011631005]
- Office of Vehicle Technologies of the U.S. DOE [DE-AC02-05CH11231]
- Batteries for Advanced Transportation Technologies (BATT) Program [7056412]
- Division of Materials Science, the office of BES, Office of Science of DOE
- Office of Science of the U.S. Department of Energy (DOE)
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The layered oxide compounds xLi(2)MnO(3)center dot(1 - x)LiMO2 (M = Ni, Mn, Co) are of great interest as positive electrode materials for high energy density lithium-ion batteries. In-situ neutron diffraction was carried out to compare the structural changes between the classical layered compound Li[Ni1/3Mn1/3Co1/3]O-2 (x = 0) and lithium-excess layered compound Li[Li0.2Ni0.18Mn0.53Co0.1]O-2 (x = 0.5) during electrochemical cycling. In this work, lab made pouch cells were built for the in-situ study and graphite was used as the anode material. Irreversible structural change of Li[Li0.2Ni0.18Mn0.53Co0.1]O-2 during first charge (4.7 V)/discharge cycle (2.0 V) was indicated by dynamic changes in lattice d-spacing, while the Li[Ni1/3Mn1/3Co1/3]O-2 showed completely reversible structural evolution between 4.4 V and 2.5 V. Ex-situ neutron powder diffraction was performed on both pristine and chemically delithiated lithium-excess layered compounds to better understand the irreversible structure change. (C) 2013 Published by Elsevier B.V.
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