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FRCP_12b6 t1_j1c8jic wrote

Reply to comment by mrwolfisolveproblems in How do fusion scientists expect to produce enough Tritium to sustain D-T fusion (see text)? by DanTheTerrible

When an EV battery gets old it can still be reused as grid storage, even if the remaining capacity is low.

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mrwolfisolveproblems t1_j1ehkcm wrote

If an EV battery is so degraded it can provide a few hours of runtime in a car what meaningful use will it have to the grid? Has anyone actually tested this at reasonable scale beyond a simple demonstration? Who is going to pay for the infrastructure to connect all these old batteries to the grid? That grid storage argument is just thrown out there for PR. It would take decades to get off the ground and we’re going to have millions of dead battery packs in 10 years.

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FRCP_12b6 t1_j1emd2d wrote

The batteries need to be good power to weight density to be useful in a car. More weight means less range. A battery with 60% capacity is still useful on land, where weight doesn’t matter.

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mrwolfisolveproblems t1_j1gdayr wrote

So a 100kwh pack becomes 60kwh. A thousands of them together gives you 60MW for 1 hour. Peak load demand can swing 20-40,000 MW for 10+ hours at a time. That’s just peak demand, forget about base load, and that’s just in a regional area (say Texas for example) An extra 20,000 MW for 10 hours is 200,000,000 kWh. You would need 3.33 million old battery packs all tired together and synced to the grid. Not to mention every day they will lose capacity and eventually be useless even for grid storage.

TLDR: need to find a way to recycle them into new batteries like we do for lead acid batteries.

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Michaelmrose t1_j27glhf wrote

Recycling is complicated parties are working on it included the United States Advanced Battery Consortium—made up of General Motors, Ford, Stellantis, and the Department of Energy.

https://arstechnica.com/science/2022/04/lithium-costs-a-lot-of-money-so-why-arent-we-recycling-lithium-batteries/

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mrwolfisolveproblems t1_j28suc0 wrote

Thank you for posting that. Doesn’t seem like it’s too promising right now, but it’s being worked on and moving in the right direction it seems. Hopefully they make some leaps forward in the next 5-7 years.

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mrwolfisolveproblems t1_j28sxzf wrote

Thank you for posting that. Doesn’t seem like it’s too promising right now, but it’s being worked on and moving in the right direction it seems. Hopefully they make some leaps forward in the next 5-7 years.

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