High temperature investigation of electrochemical lithium insertion into Li4Ti5O12.
Li4Ti5O12was synthesized via a solid state reaction and lithiated at 400 °C in a custom built galvanostatic cell consisting of a molten LiCl-KCl electrolyte and Li-Al alloy wires as counter and reference electrodes. The material exhibits decreased rate capability at 400 °C compared to the room temperature behavior. Electrochemical lithiation at C/20 exhibits a discharge profile with both a sloping curve and flat plateau, which is indicative of a solid solution behavior before reaching a two phase region. This electrochemical behavior is shown to be correlated with reversible formation of the cubic Li2TiO3phase.
University of California, Berkeley, Department of Material Science and Engineering, Berkeley, CA, USA. isaac.markus@berkeley.edu.
Isaac M
IM
Markus
Forschungzentrum Jülich, IEK-2, 52425 Jülich, Germany.
Marco
M
Prill
Forschungzentrum Jülich, IEK-2, 52425 Jülich, Germany.
Siaufung
S
Dang
Mannheim University of Applied Science, 68163 Mannheim, Germany.
Torsten
T
Markus
Forschungzentrum Jülich, IEK-2, 52425 Jülich, Germany.
Robert
R
Spatschek
Forschungzentrum Jülich, IEK-2, 52425 Jülich, Germany.
Lorenz
L
Singheiser