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MM: Fachverband Metall- und Materialphysik

MM 48: Topical session: X-ray and neutron scattering in materials science I - Coherent X-ray Diffraction Imaging of Excitations in Metal Nanoparticles

MM 48.5: Vortrag

Donnerstag, 3. April 2014, 11:15–11:30, BAR 205

Electrode Lithiation in Lithium-Ion Batteries Investigated by In-Operando Neutron Reflectometry — Bujar Jerliu¹, Erwin Hüger¹, Beatrix-Kamelia Seidlhofer², Roland Steitz², and •Harald Schmidt¹ — ¹Clausthal University of Technology — ²Helmholtz-Zentrum Berlin

Lithium-ion batteries are widely developed and used as rechargeable power sources for portable electronic devices and will be essential in the field of automotive transportation. One of their major advantages is their low weight, and therefore the high energy density available. Kinetic processes and interface phenomena at electrodes during charging and discharging cycles play a key role for optimization of these batteries (e.g. for charging times and power density). As negative electrode material, amorphous silicon has become a promising candidate for future Li-ion battery applications due to its high theoretical specific capacity of about 4 Ah/g.

We present in-operando neutron reflectometry experiments on the lithiation of amorphous silicon electrodes during galvanostatic charging or during cyclic voltammetry. Such studies allow to monitor the modification of Li content and the corresponding volume expansion/contraction of the electrode during lithiation on the nanometer scale. Possible lithiation mechanisms are discussed.

B. Jerliu et al. Phys. Chem. Chem. Phys., 15 (2013) 7777.