I don't know what information source you contacted relating to cycle life of stated cell.
https://amprius.com/products/
The cycle quoted at the above web address states 200 - 1,200 cycles.

Keep in mind that for a given application, double energy density delivers the equivalent of twice the cycles as its half-capacity competition. But at half the weight.

Even if this battery delivered only half the cycles of the Tesla / Panasonic battery, (let’s round that to 250Wh/kg to simplify the comparison), the total mileage would be the same 300-400,000 miles.

But the single charge range of a Model S could be 800 miles.

I’m not arguing for an 800 mile car. But 500Wh/kg smashes the idea that BEVs can not compete and win against gas or liquid fueled vehicles for consumer viability.

eci said:

' Keep in mind that for a given application, double energy density delivers the equivalent of twice the cycles as its half-capacity competition. But at half the weight. '

I think that you have double dipped.
One or the other, but not both.

And the batteries are not free, if you want more KWh, you are pretty much going to double the cost, although to be sure you can realistically lug it around, which you couldn't with lower energy density batteries.

This is lab bench stuff
Unless you think the lab is at 70,000 ft.
“ Zephyr-S has now flown for 2,435 flight hours and demonstrated precise stratospheric manoeuvrability and station-keeping over points on the ground.”
Reference: https://www.aerospacetestinginternational.com/news/flight-testing/airbus-zephyr-breaks-more-aviation-records-during-flight-testing.html
Also : https://www.aaltohaps.com/zephyr
These 2021 records were done using 435 Wh/kg batteries.
They also have plans for a 775,000 square foot facility in Brighton, Colorado. The factory, targeted to be operational in 2025, the initial phase will be 500 megawatt-hours (MWh) with the potential of up to 5 gigawatt-hours (GWh) within the initial footprint.

If I have got the figures right on the relationship between charge rates and cycle life for this type of battery at the moment, I sure hope that the batteries are used where they can be swapped rather than any attempt to fast charge.

I would hate to think what the cycle life would be at 10C.

Thanks, Gryf.

Since I am just a tad short of infallible, I was hoping that someone would check to see if I have gone totally off the rails on this occasion! ;-)

However, looking at your references, I can't spot any substantial differences compared to the figures I based my comments on.

For the first reference, from Ampius, on page 8, the graph for degradation looks pretty well identical to the NASA figures I quoted, with something of the order of 350 cycles to 80%, given that they are using there a C/5 discharge rate.

In the second reference, sure, the battery can be fast charged, but there is no mention there of what cycle life they get if you do stuff in energy that fast, indeed, as your reference states:

' According to the press release, the energy density of the cells is amazing, at 370 Wh/kg, however, there is no word about the longevity and cycle life.'

I'm afraid that over the last 10 years or so I have seen all sorts of dodgy elisons, so that if you read the obvious into statements from the battery company, if they have not explicitly stated it, they later wriggle out of it!

Even Elon Musk was astounded by the misdirections and fakes in the battery industry, and he knows a thing or several about both.

I don't know if that is the case for Ampion, but until I see figures explicitly stating the cycle life under fast charge assessed by reputable third parties, I will assume that it hammers it.

I can't see anything to indicate authoritively that the cycle life and charging rates have increased at all since the NASA assessment I quoted.

Amprius is using Plasma-enhanced chemical vapor deposition (PECVD), used in solar cell production. They have acquired Centrotherm PECVD for silicon-nanowire anode production.
References:
https://batteryindustry.tech/amprius-technologies-announces-purchase-agreement-with-centrotherm-for-silicon-nanowire-anode-production/
https://www.centrotherm.de/en/equipment/c-plasma-x
They also have a DOE grant to study “High Throughput Source-less Plasma Deposition of Structured Silicon Anodes “,
https://www.energy.gov/sites/default/files/2022-09/CX-026594.pdf

Earlier (2016) Amprius used CVD equipment from the Dutch firm Meyer Burger,
https://chargedevs.com/newswire/amprius-demonstrates-new-tool-for-manufacturing-of-silicon-nanowire-anodes/

Amprius is using a “Nano” process which may produce the highest energy densities, however is a more expensive process compared to other silicon anodes.
So they will probably focus on Aerospace/Defense rather than EV.
Silicon Anodes are being developed by many other companies. UCSD and LG ES have shown that Silicon Anodes work well with Sulfide Solid State Electrolytes.
LG ES is working with Silicon “Micro” particles which are less expensive.
Maybe a 4680 Cylindrical cell using a Silicon Micro Particle Anode, a Hybrid Sulfide–Polymer Solid State Electrolyte, and NCM811 cathode would work on that Tesla Semi.
References:
https://www.electrive.com/2021/09/27/lg-es-uc-san-diego-announce-silicon-based-solid-state-battery/
https://neobatterymaterials.com/two-track-si-development/
https://neobatterymaterials.com/neo-battery-materials-provides-south-korean-commercial-plant-and-corporate-updates/
“Non-Conductive Polymers Enable Higher Ionic Conductivities and Suppress Reactivity in Hybrid Sulfide-Polymer Solid State Electrolytes”
https://pubs.acs.org/doi/10.1021/acsaem.2c01388