Does Proterra really make batteries or, when they say "produced", do they really mean assembled into battery packs?
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What other tech stock to consider?
- Thread starter Sanny
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JRP3
Hyperactive Member
JRP3
Hyperactive Member
Amprius wins an award for their battery tech
finance.yahoo.com
Also announces third party verified 500Wh/kg cell
finance.yahoo.com
Amprius Wins Best of Show New Product Award at 2023 International Battery Seminar
FREMONT, Calif. & ORLANDO, Fla., March 23, 2023--Amprius Technologies, Inc. ("Amprius" or the "Company") (NYSE: AMPX), a leader in next-generation lithium-ion batteries with its Silicon Anode Platform, is pleased to announce that its 450 Wh/kg, 1150 Wh/L lithium-ion battery cell was voted the...
Also announces third party verified 500Wh/kg cell
The All-New Amprius 500 Wh/kg Battery Platform is Here
FREMONT, Calif., March 23, 2023--Amprius Technologies, Inc. ("Amprius" or the "Company") (NYSE: AMPX), a leader in next-generation lithium-ion batteries with its Silicon Anode Platform, is once again raising the bar with the verification of its lithium-ion cell delivering unprecedented energy...
Looks like a high silicon pouch cell with values measured at 30% SOC (low expansion) without supporting structure (low mass).Amprius wins an award for their battery tech
Amprius Wins Best of Show New Product Award at 2023 International Battery Seminar
FREMONT, Calif. & ORLANDO, Fla., March 23, 2023--Amprius Technologies, Inc. ("Amprius" or the "Company") (NYSE: AMPX), a leader in next-generation lithium-ion batteries with its Silicon Anode Platform, is pleased to announce that its 450 Wh/kg, 1150 Wh/L lithium-ion battery cell was voted the...
Also announces third party verified 500Wh/kg cell
The All-New Amprius 500 Wh/kg Battery Platform is Here
FREMONT, Calif., March 23, 2023--Amprius Technologies, Inc. ("Amprius" or the "Company") (NYSE: AMPX), a leader in next-generation lithium-ion batteries with its Silicon Anode Platform, is once again raising the bar with the verification of its lithium-ion cell delivering unprecedented energy...
JRP3
Hyperactive Member
It looks like the volumetric value is measured at 30% SOC not the gravimetric density.
Superior Battery Performance
- High Energy Density
- Up to 450 Wh/kg(2) and 1,150 Wh/L(2)(3)
(1) Actual percentage of silicon is 99.5-99.9% which is within the range of acceptable purity levels for materials that are considered 100%.
(2) At C/10 and 23°C.
(3) Volumetric energy density is calculated using body dimensions at 30% state of charge (“SoC”).
Yeah, I should have been clearer on tying the conditions to the values. SOC doesn't impact gravimetric, or specific, energy density; it's volume independent and based on a full charge.
JRP3
Hyperactive Member
What I'm not clear on is how much does the pouch expand at full charge that they have to measure at only 30% SOC to get what I assume is their maximum value, does it blow up like a balloon?
I know silicon can expand 3x so it depends on it's volume vs the rest of the cell and cathode changes. From the crossection image of the anode I wonder about longevity and ion travel distance.
Stable high-capacity and high-rate silicon-based lithium battery anodes upon two-dimensional covalent encapsulation - Nature Communications
Paper on volume changes on a cell can, not really applicable, but cool CAT images:
https://d-nb.info/1225880130/34
Paywalled, but has a graph:
https://www.researchgate.net/figure...arious-C-rates-a-shows-average_fig3_325286870
JRP3
Hyperactive Member
The Amprius silicon nanowire anode seems to have space between the nanowires which should provide some area for expansion before pressing against the cell layers.
But that's what it looks like when it doesn't have cathodes pushed into it. The internal wire seems like it would help though.
Small world that they are across the street from Kato and the Fremont factory.
JRP3
Hyperactive Member
JRP3
Hyperactive Member
From the letter:
Received our first large-scale anode production
machine from centrotherm in October: This
machine is now installed at our Fremont facility
and is expected to increase our capacity for silicon
anode production to approximately 2 MWh, or
about ten times our current capacity, exiting
2023.
JRP3
Hyperactive Member
It's an anode so should be compatible with any lithium cathode chemistry.
JRP3
Hyperactive Member
Well yes, they have cells with LiCo and NMC, maybe others, check the PDF I linked previously.
Ok, I will, but I'm curious about this 500 wh/kg battery that they did the big press release about, specifically. Is it LiCo, NCA, NMC, or another chemistry? Seems unlikely that it would be a "pure" LiCo chemistry. The press release was light on details. Cycle life at 100% DoD would be good to know too.
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