In-situ neutron diffraction study of the xLi2MnO3•(1-x)LiMO2 (x=0, 0.5; M = Ni, Mn, Co) layered oxide compounds during electrochemical cycling

JOURNAL OF POWER SOURCES

卷:240

Article

Liu, Haodong¹  Fell, Christopher R.²  An, Ke³  Cai, Lu³  Meng, Ying Shirley¹ 

[1] Univ Calif San Diego, Dept NanoEngn, La Jolla, CA 92121 USA

[2] Johnson Controls Inc, Global Technol & Innovat, Power Solut, Milwaukee, WI 53209 USA

[3] Oak Ridge Natl Lab, Chem & Engn Mat Div, Oak Ridge, TN 37830 USA

关键词: Lithium-ion battery;    In-situ neutron diffraction;    Layered oxide cathode;    Graphite anode;   

DOI  :  10.1016/j.jpowsour.2013.04.149

来源: Elsevier

【 摘 要 】

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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