Coretec Group Inc (CRTG)

[iamthe walrus]

from the patent from Theion published march 23rd 2022
[0007] Lithium metal anode volumetric capacity in fully discharged state is 0 mAh/cm3 so all lithium was stripped down from e.g. a Cu foil during discharge and transferred towards the cathode. So lithium in fully charged state has a capacity of 2061 mAh/cm3 compared to silicon which has in fully discharged state a capacity of 8334 mAh/cm3 and fully lithiated - charged state 2193 mAh/cm3. So those numbers disclose advantages of using lithiated silicon anode instead of LMA (lithium metal anode). This is because theoretical volumetric fluctuation of lithium metal is 100% represented by average 0.205 mAh/cm2 per 1 micron of thickness. Thus, a LMA anode is dimensionally unstable. So on discharging (stripping) the thickness of lithium metal foil decrease where opposite on charging (plating) increase. In comparison to graphite which is the most commonly used anode material, all volumetric fluctuations during cycling of the inventive anode is compensated inside the internal voids/porosity (˜30% of the volume) of anode with only minor changes of anode thickness.