Gregory Gershinsky, Elad Bar, Laure Monconduit, David Zitoun
Energy and Environmental Science, 2014, C4EE00490F
One of the challenges in the development of batteries consists in the investigation of new electrode materials and comprehension of the mechanism of lithium uptake. Herein, we report on the first in operando measurements of electron magnetism on a battery during cycling. We have succeeded in designing a non magnetic cell and have investigated the lithiation mechanism of FeSb2, a high energy density anode material. The stepwise increase of the magnetic moment reveals an increase of amorphous Fe nanoparticle size, while Sb undergoes a reversible alloying with Li.