81–90 of 211 posts
> it could release highly toxic hydrogen sulfide gas. How bad is it in real world conditions? Because from what I'm reading it's not the "it makes you sick" kind of toxic, but rather the "it kills you in seconds" kind of toxic.
Depending on concentrations required for consequences a smelly gas is much safer than something like CO
[1] https://dodtec.com/news/the-potential-dangers-of-hydrogen-su...
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If it could only reduce the weight of current EVs that would be a win. Most electric vehicles weight 1000 lbs or more than their ICE counterparts, and in the extreme case of the Hummer, the total weight is over 9000 lbs. Vehicles seem to be continuously ballooning in size, so whether that continues or eventual legislation forces more reasonable sizes, higher energy density would be very welcome.
When will this meme die? A Model 3 is very comparable in weight to an Audi S3. The Hyundai Ionic 5 is comparable weight and interior volume to a Toyota Rav 4. The Hummer is a monster either way and is not a good sample.
In Europe people frequently buy compact cars.
Let's take VW Golf as an example. The lightest version of the current model weighs 1300kg, more or less.
The EV equivalent, ID.3, weighs 1800kg. That's 500kg extra (!) which is almost 40% more.
That's an insane amount of extra weight for a small car.
The percentage difference becomes less for bigger cars, so I imagine that's why some Americans don't notice it as much.
But for the rest of the world (95% of the world's population), that's a huge deal.
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When will this meme die? A Model 3 is very comparable in weight to an Audi S3. The Hyundai Ionic 5 is comparable weight and interior volume to a Toyota Rav 4. The Hummer is a monster either way and is not a good sample.
I always bought into this "meme", in part because just about every EV review I've seen mentions having to compensate for the extra weight which makes those cars less performant at times, so decided to look it up based on your quoted vehicles here, and figured I'd save anyone else the same search: A 2023 Rav 4 has a curb weight of between 3615 and 3775 lb [1] A 2023 Ioniq 5 has a curb weight of between 3968 and 4663 l…
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I remain skeptical until the products are real and affordable. No reason to buy an electric car now if they'll have potentially double the range in a few years.
Yet another problem that could have been avoided if government had had the foresight to enforce a technology-agnostic swappable battery standard.
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Also people who don't do all their driving in the city. That 250-mile battery shrinks a lot when your whole trip is at 80mph.
Plus it’s not always 70° in most places so the estimate is almost always optimistic to begin with
This will be neat if it works but really there isn't going to be a huge market for 500+ mile cars vs the cost savings of getting a 300-400 mile car. The exception might be road-trippers and people who do a lot of towing but I suspect that is a much smaller population than people tend to think.
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Are batteries still on a roughly 3-4% annual rate of improvement? Or has that shifted? So,e of that will have been aerodynamics (the industry is slowly boiling the frog on styling vs aerodynamics) and motor efficiency, which has climbed a lot in the last 15 years.
energy density hasn't really changed for 15 years, price dropped a lot though, but price drop has also paused recently. There is no telling if any progress will be made or not. Maybe! Maybe not.
Volumetric numbers from the DOE suggest it went from 55 Wh/l in 2008 to 450 in 2020, which a compound interest calculator tells me is about 20% per year. Which is an awful lot.
Physics world says 80Wh/kg when Sony introduced them in 1991, and 300 today (although someone above said 270 is what ships), which looks like about 5.1%. But the lab experiment numbers are substantially more than that https://physicsworld.com/a/lithium-ion-batteries-break-energ... and shows that the exponential curve was visible back in about 2014. These of course have little to do with production numbers. The bigger the breakthrough the longer it takes to commercialize (or the more watered down it becomes to be commercialized). That was the wisdom when Wall Street was interested in new battery companies.
5% means every 14 years power doubles. We've been flirting with electric vehicles at least that long.
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When will this meme die? A Model 3 is very comparable in weight to an Audi S3. The Hyundai Ionic 5 is comparable weight and interior volume to a Toyota Rav 4. The Hummer is a monster either way and is not a good sample.
Are there any EVs with Honda Civic or Accord or BMW 2 series weight? E.g. <3500lb? Even a Leaf seems to start at 3500lbs now.
The current generation of battery tech is just a little heavier than would be competitive to ICE on weight. Gasoline holds a lot more energy than a battery can, but the engine is heavier. If/when battery density is able to double (and this solid state tech is 2x-3x current battery, so it would be a game-changer), you would have very similar car weights. This seems to be one of the reasons the big trucks are first, adding a thousand pounds to a 6000 lb. truck isn't as bad as adding that to a car half the weight. I expect we will eventually see vehicles that weight less than the ICE counterpart that get a reasonable range, but hard to say when battery tech advances that much.
This seems like semi-decent conjecture that'd get a lot of pull with the electric car crowd on the Fediverse, and you'd get a fair number of eyeballs pointed in the same direction.
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Are batteries still on a roughly 3-4% annual rate of improvement? Or has that shifted? So,e of that will have been aerodynamics (the industry is slowly boiling the frog on styling vs aerodynamics) and motor efficiency, which has climbed a lot in the last 15 years.
energy density hasn't really changed for 15 years, price dropped a lot though, but price drop has also paused recently. There is no telling if any progress will be made or not. Maybe! Maybe not.
I am quite certain they are just doing alchemy and have tricked us all (it is of course well known that chemE’s are actually the cleverest type of engineer).