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Old 12-09-2020, 12:08 PM   #1 (permalink)
redpoint5
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QuantumScape Solid State Battery

I hate battery news as much as anyone, but a company called QuantumScape IPOed recently and the stock went through the roof yesterday after announcing some details about their technology and their timeframe to implement in actual EVs. VW invested 300M into the company and appears to be the first to utilize the tech in the 2025 timeframe. Bill Gates has also personally invested.

Basically, they have eliminated the anode of the battery, saving that space and weight, and created a separator that is impervious, which means no dendrite problems (safer battery).

One issue I see is that the battery expands significantly when charged, so it has to be allowed to move in 1 direction when charging. It basically builds an anode by shuffling lithium ions to the anode side when charging, and shrinks in volume as it discharges.

Another issue is that the gains in charging speed, durability, and energy density don't seem to be that far ahead of what Tesla is planning without that tech. It remains to be seen if manufacturing will be cost competitive. QS claims to have cut a major cost in the manufacturing process (20%) by eliminating the need to build certain layers by completing initial charge cycles in the factory.

Anyhow, it's the one battery "news" thing that seems promising to me amongst all the click bait stuff out there.

Here's the QuantumScape Zoom video released yesterday.

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