From The Limiting Factor.
Donut Lab claims to have a battery that achieves a whopping 400 Wh/kg of energy density, charges in 5 minutes, lasts for 100,000 cycles, uses abundant non-toxic materials, can maintain performance at extremely low temperatures, is safe at very abusive temperatures, and is lower cost than lithium ion batteries.
The question is: Is the Donut Battery real?
In my view, it’s not, and in today’s video, I’m going to walk you through why that’s the case from a first principles physics perspective and from a more pragmatic manufacturing perspective.
Ziroth Analysis Video on Speculation: https://www.youtube.com/watch?v=V8mkD6g9Ujc
Two Bit’s Analysis on Donut’s First Set of Test Results: https://youtu.be/3PwEA-tBufI?si=6lQvMSrQ2E3RDzkn
Tom Bötticher Analysis Video: https://www.youtube.com/watch?v=E7HO1082Hko
Channel Sponsor:
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Signature Solar Referral Link:
https://signaturesolar.com/?ref=TheLimitingFactor
These are the part of my system I purchased from Signature Solar:
-EG4 6000XP Off-Grid Inverter (I use this for my grid-tied solar system with battery backup)
-SnapNrack | TopSpeed™ | Solar Panel Roof Mount Kit (you can also get a skirt)
-SnapNrack, GROUNDING LUG
-PV 2 Wire Management Clip
-10 AWG Copper PV Wire | Black and Red
-Staubli | 20A | 1000V | In-line Fuse with MC4 Connectors (your amps may vary)
-I cobbled together the cheapest solar and batteries from other sites. I expected it to save me money, but it ended up costing more for integration and I lost some functionality. If I did it again, I’d just by everything from Signature Solar in a package – they have kits with the batteries, inverter, and panels.
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*Timeline*
00:00 Introduction
01:11 Defining Real
02:10 Ragone Plotting
04:17 Remembering QuantumScape
06:39 Battery Physics
10:56 Supercap Physics
14:11 Physics Summary
15:19 Manufacturing
18:45 Summary
Intro Music by Dyalla: Homer Said
