Technology

59534 readers

3223 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 1 year ago

MODERATORS

322

New Cobalt-Free Silicon EV Battery Is The Best Thing Ever (cleantechnica.com)

submitted 3 months ago* (last edited 3 months ago) by ArtikBanana@lemmy.dbzer0.com to c/technology@lemmy.world

43 comments fedilink hide all child comments

“This breakthrough development translates into a remarkable improvement in cell-core energy density, reaching 2,000Wh/L in batteries and approximately 1,700Wh/L in full-size EV batteries – more than double the performance of current state-of-the-art technologies,”

“Sienza’s 3D pure silicon anode has demonstrated an average gravimetric capacity of 2,941 mAh/g,” Professor Gharib said. “This means that for every gram of silicon, our batteries can store 2,941 milliampere-hours of electricity, significantly higher than the industry standard for graphite, with a gravimetric capacity of 372 mAh/g.”

Aside from completely avoiding the cobalt issue, Sienza notes that its manufacturing process does not rely on the solvent-based coating systems deployed for producing conventional lithium-ion batteries. Sienza cites one commonly used solvent in particular, N-methyl-pyrrolidone (NMP).

you are viewing a single comment's thread
view the rest of the comments

[–] 5C5C5C@programming.dev 55 points 3 months ago (2 children)

Nothing is ever better in every conceivable way than the current state of the art.

Probabilistically, sure, but it's not impossible that there has been some piece of knowledge or understanding that's been missing, and that massive breakthroughs are possible once the process is figured out.

I think a fair modern example is LED light bulbs. They are better in every conceivable way than incandescent or fluorescent lightbulbs: they last longer, use less energy, shine brighter, use less toxic materials, and are easy to mass produce. But there were several decades where much of the industry believed that LEDs would never be very useful as a light source because we could only produce red and green, and it was generally believed that a blue LED would be impossible to produce.

Then one guy decided it would be his life mission to invent the blue LED, and the sonuvabitch did it. Now LEDs are the only sensible thing to use to produce light.

It's always possible for this kind of breakthrough to happen, especially in material science where the complexity of how molecules interplay is nearly incomprehensible.

[–] MonkderVierte@lemmy.ml 9 points 3 months ago (2 children)

A breaktrough would be needed to electrify ship and flight. Would be great if it is that.

[–] Moah@lemmy.blahaj.zone 2 points 3 months ago

For ships they are rediscoverings sails so that might be enough

[–] chiisana@lemmy.chiisana.net 2 points 3 months ago

Electrify ship you say?

We’ve seen so many battery breakthroughs in academia in the past decade, it’s about time some of them start to transition into production.

[–] Moah@lemmy.blahaj.zone 7 points 3 months ago (3 children)

LEDs are worse at color accuracy (CRI) which is hardly relevant unless you need it, but it's just to show that even they aren't strictly better than what they replace

[–] drosophila@lemmy.blahaj.zone 2 points 3 months ago* (last edited 3 months ago) (1 children)

CRI is defined as how closely a light source matches the spectral emission of a thing glowing at a specific temperature. So, for a light source with a 4000 k color temperature its CRI describes how closely its emission matches that of an object that's been heated to 4000 k.

Because incandescent bulbs emit light by heating a filament by definition they will have 100 CRI and its impossible to get any better than that. But the emission curve of incandescent lights doesn't actually resemble that of sunlight at all (sorry for the reddit link). The sun is much hotter than any incandescent bulb and it's light is filtered by our atmosphere, resulting in a much flatter more gently sloping emission curve vs the incandescent curve which is extremely lopsided towards the red.

As you can see in the above link, there are certain high end LED bulbs that do a much better job replicating noon day sunlight than incandescents. And that flatter emissions profile probably provides better color rendering (in terms of being able to distinguish one color from another) than the incandescent ramp.

Now, whether or not you want your bulbs to look like the noon day sun is another matter. Maybe you don't want to disrupt your sleep schedule and you'd much rather their emissions resemble the sunset or a campfire (though in that case many halogen and high output incandescent lamps don't do a great job either). Or maybe you're trying to treat seasonal depression and extra sunlight is exactly what you want. But in any case I think CRI isn't a very useful unit (another reddit link).

[–] Moah@lemmy.blahaj.zone 1 points 3 months ago

I find this info interesting, especially the fact that incandescent bulbs do not replicate sunlight. At the same time, I was also trying to keep things simple as just a minute counter point. But I guess I was wrong anyway, and that led bulbs are better in every way than incandescent bulbs then.

[–] sugar_in_your_tea@sh.itjust.works 1 points 3 months ago* (last edited 3 months ago)

And early LEDs had flickering issues w/ dimmers. And somehow they're still way more expensive than incandescent bulbs (not sure about per hour of use, but certainly by unit, which matters when renting).

[–] prime_number_314159@lemmy.world 1 points 3 months ago

You can buy high (97-99) CRI LEDs for things like the film industry, where it really does matter. They are very expensive, but can pay for themselves with longer service life, and lower power draw for long term installations.

The CRI on regular LED bulbs was climbing for a long time, but it seems as though 90ish is "good enough" most of the time.