Matt Lacey Profile picture
28 Jan, 4 tweets, 2 min read
Another creative excuse from a Swedish public official

Head of @Folkhalsomynd says: "I missed that the time was in the commuter hours", after being spotted breaking rule on face masks on public transport during commuter hours, on his regular commute

svt.se/nyheter/lokalt… /1
I'm still impressed by our state epidemiologist's brazen "I'm standing far in front of the others", after being photographed manifestly not keeping distance at a Gothenburg restaurant last year

friatider.se/anders-tegnell… /2
And more recently, Prime Minister Stefan Löfvén being spotted in a shopping mall before Christmas, 2 days after imploring the public not to visit them: "I have never shopped online"

svt.se/nyheter/inrike… /3
Then of course there is former head of the Civil Contigencies Agency Dan Eliasson, "It was necessary", he said of his Christmas trip to the Canary Islands (the second in two months), while everyone else was asked to stay home /4

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More from @mjlacey

8 Dec 20
Seems my threading earlier on @QuantumScapeCo went a bit bananas, so I'll collect some general post-presentation post-dinner thoughts/questions/observations under here... 1/
So finally we got to see some cycling data: 1 hour charge/discharge, practical capacities, >800 cycles achieved seemingly quite readily - for a so-called anode free Li metal cell these results are very impressive! 2/
Key caveat though - these are single layer pouch cells, which need to be brought up to many (20+) layers to commercialise. This is presumably not easy else I'd expect a company at this stage to show proof of concept multilayer cells... 3/
Read 14 tweets
8 Dec 20
Settling down for the much-anticipated #QuantumScape reveal. A little taste of this already on their website, link below. Feels like a thread coming on... ir.quantumscape.com/news/news-deta…
Interesting to hear from the start a clear disclaimer about this showcase presenting "forward looking statements", making clear that reality might differ from expectation outside of QS's control
Recap of investment: they're well-funded by now, having raised ~$1.5bn so far, about ~$300m has gone into R&D so far. VW are committed to the tune of $300m, and have a joint venture with QS for manufacturing. Now they're listed, market cap was ~$15bn last I checked...
Read 20 tweets
5 Sep 20
Some additional thoughts and numbers on #QuantumScape. Long story short: my estimate is that an "anode-free" solid state cell should fetch ~350 Wh/kg, in the absence of some new miracle positive electrode. Bit lower than 380-480 Wh/kg QS have stated. Thread... 1/
My starting point for my (medium crude) calculations is Tesla - they have probably the most energy-dense +ve on the market now: NCA w/ 90% Ni and a high capacity of ~4.5 mAh/cm2. My cell model gets pretty close to the Model 3 2170 cell numbers, so it's an ok starting point. 2/ Image
My gut feeling is that QS are going to be using a similar Ni-rich electrode, despite mentions of new conversion cathodes - because I think the latter is one technology leap too many for me to believe without any good evidence to the contrary... 3/
Read 13 tweets

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