nl5b00326_si_001.avi (4.75 MB)
New Lithium Metal Polymer Solid State Battery for an Ultrahigh Energy: Nano C‑LiFePO4 versus Nano Li1.2V3O8
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posted on 2015-04-08, 00:00 authored by P. Hovington, M. Lagacé, A. Guerfi, P. Bouchard, A. Mauger, C. M. Julien, M. Armand, K. ZaghibNovel
lithium metal polymer solid state batteries with nano C-LiFePO4 and nano Li1.2V3O8 counter-electrodes
(average particle size 200 nm) were studied for the first time by
in situ SEM and impedance during cycling. The kinetics of Li-motion
during cycling is analyzed self-consistently together with the electrochemical
properties. We show that the cycling life of the nano Li1.2V3O8 is limited by the dissolution of the vanadium
in the electrolyte, which explains the choice of nano C-LiFePO4 (1300 cycles at 100% DOD): with this olivine, no dissolution
is observed. In combination with lithium metal, at high loading and
with a stable SEI an ultrahigh energy density battery was thus newly
developed in our laboratory.