47
Auto execs are coming clean: EVs aren't working
(www.businessinsider.com)
you are viewing a single comment's thread
view the rest of the comments
view the rest of the comments
this post was submitted on 08 Nov 2023
47 points (60.0% liked)
Technology
59982 readers
2509 users here now
This is a most excellent place for technology news and articles.
Our Rules
- Follow the lemmy.world rules.
- Only tech related content.
- Be excellent to each another!
- Mod approved content bots can post up to 10 articles per day.
- Threads asking for personal tech support may be deleted.
- Politics threads may be removed.
- No memes allowed as posts, OK to post as comments.
- Only approved bots from the list below, to ask if your bot can be added please contact us.
- Check for duplicates before posting, duplicates may be removed
Approved Bots
founded 2 years ago
MODERATORS
EVs are expensive because of the battery.
A cheap car is not a novelty, specially for asian manufacturers. There is no cheap EV because there is no cheap big ion-li battery.
Toyota strategy of focus on hybrid and hydrogen seemed weird to me. But over the years has been started to make sense.
The world needs a better battery. Until that, EVs will be heavy and expensive.
Very much this. Lithium batteries are the best battery we’ve got (at manufacturing scale) so far in terms of energy storage density, but the best we’ve got isn’t very good.
Gasoline has an energy storage density of around 13 MJ/kg. That’s a ton of energy, so much so that a vehicle can waste most of it generating so much heat that we have to bolt on a cooling system (with the associated weight) and still have enough to go highway speeds for hundreds of miles on a quantity of fuel weighing less than one of the passengers.
Toyota loves hydrogen because it’s got a storage density slightly higher than gasoline. Hydrogen has some serious volume and storage issues, but the density is there.
Contrast that with lithium ion batteries at ~0.7 MJ/kg (for the really good ones, which usually aren’t used in cars). Less waste heat, to be sure, but the bulk of the vehicles weight, the main factor in speed and travel distance, is the insane amount of material necessary to store the “fuel”.
Electric motors are far more efficient than ICE, but we need orders-of-magnitude improvements in battery storage density before EV can really take advantage of the greater efficiency. Until then manufacturers don’t have a choice, EV will be heavy and thus expensive.
Hydrogen cars are basically EVs without the giant battery. So it neatly avoids the huge cost and weight problem. Which is why Toyota thinks they are the future.