Thanks for this, good thread. I encourage you to also post your analysis here at TMC.
Early sample Tesla 4680 cells have no silicon in the anode. This puts them at an energy density disadvantage vs. Panasonic 2170s currently produced at Giga Nevada. I look for Tesla to update 4680 anode chemistry when Cybertruck goes into production in Texas.
Increase in energy density w. silicon anode could be up to 25%: (this allows for a 188KWh pack in the volume of a 150KWh pack w/o silicon)
Then we have to figure in Cybertruck's superior aerodynamics. It's Cd is 0.39 vs 0.59 for an F150 Raptor:
One thing that Elon Musk emphasized about the Cybertruck during its unveil is that its design is about more than just aesthetics. We already know the thick, angular steel plates makes for a stronger frame and theoretically lower build cost,
thenextweb.com
View attachment 917748
Using an online calculator, given 7,000 lbs weight, 35" diameter tires, Cd of 0.39 and 31.5 sq.ft frontal area (same as Ford F-150 Lightning) we get an
estimated 0.362 KWh/mi energy consumption at 60 mph:
This result implies ~180 KWh energy required to drive 500 miles on the highway at 60 mph, or ~96% of a hypothetical Si-anode battery pack. Such a pack will be able to charge @ 350KW from 10% to 85% adding 385 miles of range in about 24 min.
With silcon-doped anodes, these cells may have a max charge rate of 6C (nominally 100% in 10 min), thus they would be limited by v3 Supercharger output. However, these new cells would also be able to
sustain max charge rate longer via tapering later/shallower.
TL;dr A 500-mile range Cybertruck is realistic w/o requiring a dual-layer battery pack when silicon anode material is used in 4680 production cells.