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Donut Labs Drops High Temperature Performance Report [pdf]

4 points by sagyam 7mo ago

sagyam 7mo ago
Donut Lab drops another VTT report this time focused on High Temperature Performance Here is the TLDR: The Battery & Test Setup - Cell tested: Donut Lab "Solid-State Battery V1" – a pouch cell labeled DL2 - Nominal specs: 26 Ah capacity, 3.6V nominal voltage, 94 Wh energy - Tested by: Independent third-party lab (VTT) at customer request - Test equipment: PEC ACT0550 cell tester + Weiss climate chamber capable of -40°C to +180°C Performance Results - Actual capacity measured: 24.9 Ah (slightly below 26 Ah nominal, but within reasonable variance) - +80°C discharge: Delivered 110.5% of room-temperature capacity (27.48 Ah vs 24.87 Ah at 24A) - +100°C discharge: Delivered 107.1% of room-temperature capacity (27.61 Ah at 12A) - Energy efficiency: ~89-90% round-trip efficiency observed - Charging: All charging performed at +20°C for safety; cell accepted charge normally after both high-temp tests Physical Observations Cell used a 2.4kg steel plate on top for mechanical pressure during testing Post-100°C test: Cell pouch lost vacuum (visible inflation/deflation) but remained electrically functional No visible damage after 80°C test; cell appeared physically intact after 100°C test despite vacuum loss Missing claims Energy density: No weight and volume was mentioned Cycle life: VTT ran only 3 test cycles total. Cost Claims: Nothing about cost is mentioned Material Claims: No chemical analysis or materials analysis. No abuse testing: No nail penetration, no overcharge, no short-circuit, no crush tests. Company has said next report will drop next monday i.e. March 9th
szmarczak 7mo ago
From the previous test, the data seems to match NMC which does contain Lithium: https://youtu.be/3PwEA-tBufI?si=5r2AmBmFctMuYfSC&t=233 https://youtu.be/3PwEA-tBufI?si=5r2AmBmFctMuYfSC&t=233
- sagyam 7mo ago
  Yep given the weekly drip feed of information and charging fingerprint matching a high-end NMC battery. I am finding this more and more sus. It's probably a very high end expensive battery but not the miracle that was promised in CES.
vipulbhj 7mo ago
This campaign should have been called "I Donut Don't Believe" from the two reports that have dropped so far, mega sus

4 points by sagyam 7mo ago

Donut Lab drops another VTT report this time focused on High Temperature Performance Here is the TLDR: The Battery & Test Setup - Cell tested: Donut Lab "Solid-State Battery V1" – a pouch cell labeled DL2 - Nominal specs: 26 Ah capacity, 3.6V nominal voltage, 94 Wh energy - Tested by: Independent third-party lab (VTT) at customer request - Test equipment: PEC ACT0550 cell tester + Weiss climate chamber capable of -40°C to +180°C Performance Results - Actual capacity measured: 24.9 Ah (slightly below 26 Ah nominal, but within reasonable variance) - +80°C discharge: Delivered 110.5% of room-temperature capacity (27.48 Ah vs 24.87 Ah at 24A) - +100°C discharge: Delivered 107.1% of room-temperature capacity (27.61 Ah at 12A) - Energy efficiency: ~89-90% round-trip efficiency observed - Charging: All charging performed at +20°C for safety; cell accepted charge normally after both high-temp tests Physical Observations Cell used a 2.4kg steel plate on top for mechanical pressure during testing Post-100°C test: Cell pouch lost vacuum (visible inflation/deflation) but remained electrically functional No visible damage after 80°C test; cell appeared physically intact after 100°C test despite vacuum loss Missing claims Energy density: No weight and volume was mentioned Cycle life: VTT ran only 3 test cycles total. Cost Claims: Nothing about cost is mentioned Material Claims: No chemical analysis or materials analysis. No abuse testing: No nail penetration, no overcharge, no short-circuit, no crush tests. Company has said next report will drop next monday i.e. March 9th

szmarczak 7mo ago

From the previous test, the data seems to match NMC which does contain Lithium: https://youtu.be/3PwEA-tBufI?si=5r2AmBmFctMuYfSC&t=233 https://youtu.be/3PwEA-tBufI?si=5r2AmBmFctMuYfSC&t=233

sagyam 7mo ago
Yep given the weekly drip feed of information and charging fingerprint matching a high-end NMC battery. I am finding this more and more sus. It's probably a very high end expensive battery but not the miracle that was promised in CES.

vipulbhj 7mo ago

This campaign should have been called "I Donut Don't Believe" from the two reports that have dropped so far, mega sus