New Lithium metal polymer solid state battery for an ultra-high energy: Nano C-LiFePO4 versus Nano Li1.2V3O8

International audienceNovel lithium metal polymer solid state batteries with nano C-LiFePO4 and nano Li1.2V3O8counter-electrodes (average particle size 200 nm) were studied for the first time by in-situ SEMand impedance during cycling. The kinetics of Li-motion during cycling is analyzed selfconsistentlytogether with the electrochemical properties. We show that the cycling life of the nanoLi1.2V3O8 is limited by the dissolution of the vanadium in the electrolyte, which explains the choiceof nano C-LiFePO4 (1300 cycles at 100% DOD): with this olivine, no dissolution is observed. Athigh loading and with a stable SEI, in combination with lithium metal, an ultra-high energy densitybattery was thus newly developed in our laborator