New Lithium metal polymer solid state battery for an ultra-high energy: Nano C-LiFePO4 versus Nano Li1.2V3O8
Résumé
Novel 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 selfconsistently
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. At
high loading and with a stable SEI, in combination with lithium metal, an ultra-high energy density
battery was thus newly developed in our laboratory