- cross-posted to:
- technology@lemmy.ml
- cross-posted to:
- technology@lemmy.ml
cross-posted from: https://lemmy.ml/post/17926125
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Just for comparison: the energy density of gasoline and diesel is around 10,000 Wh/kg.
Never knew about this metric before.
I’m looking forward to the instant benefits for e-bikes!
The thing is when gasoline is used to power a car about 80% of the energy is loss to heat and only about 20% is used to actually move the car on average. It’s worse when you are doing acceleration and better when cruising at a steady speed on a level surface.
Yeah, so you have to divide it by a factor of 5. Which still makes gasoline roughly 5 times as energy dense than this prototype battery, instead of 25 times.
Another problem is the increased complexity of fossil fuel vehicles, specifically in stuff like the engine, gears, pollution filters, etc. A fossil fuel vehicle is just intrinsically more complicated. Which doesn’t directly relate to the density, but it gives electric vehicles an advantage.
The weight itself is an engineering challenge.
With passenger vehicles, the problems have largely been solved. With motorcycles, there are still some tradeoffs on range (especially highway). With large cargo trucks, the weight causes issues with range, weight capacity, and charging times. With aircraft, there’s not really competition on the horizon.
And electrification of heat production itself for climate control, cooking, hot water, industrial processes, etc. is coming along, too, on an application by application basis. (But note that the energy “lost” to heat is less of a factor for these uses.)
Not sure how much it’d improve ebikes. Maybe if you want to take a bike trip longer than 100 miles.
If anything, sodium batteries are more exciting for ebikes. They’re more than enough for getting around town, and they’re cheap.
Current tech is 200 to 250 so a substantial reduction in battery weight, 50% or 60%
Huge leap forward if the process is in the same ballpark expense wise. Being able to reduce a cars battery by 50% would reduce the prices by at least 5k, and likely have longer range because of the reduced weight.
Edit : still very experimental. Battery only retains that energy density for 300 charges. This is an improvement from an earlier 50 cycles, but not really viable either.
I used to have some old copy pasta for this on Reddit but I’ll be damn if I’m logging in to retrieve it.
So I’ll paraphrase:
Has the battery been made or is it a concept? Has the battery been made to the scale that the claim argues it can hit? What is the price? How many charge cycles? What’s the temperature range it can operate within? Can the battery fit into the existing production processes or will it require new tooling to productionize? Does the battery require any novel materials that aren’t available at scale yet or at the price that’s been assumed? Does the production of the battery have any bi-products that haven’t been handled industrially before? Will the battery require new safety approvals? Will the production require new safety training? What’s the size and the weight of the battery? What’s the charge and discharge rate? How does the temperate of the battery get affected by charging and discharging? Is the battery as safe under puncture and deformation as existing batteries? Can the battery be recycled as easily as existing batteries?
Etc etc
“China develops new battery” needs an answer to all these questions before anything meaningful has been developed. Until then it’s just a theory in a lab. For every 1000 things that work in a lab, one escapes and becomes a product you can buy in a store.
As someone that worked in a battery lab for a short period of time I agree. These are exactly the types of questions that need to be asked for any battery related technology article (not just China, other institutions around the world do this as well)
Hope it becomes reality soon unlike graphene.
