Applying 'extreme heat' to lithium-ion batteries reportedly restores their capacity, and I think it's the sustainable tech breakthrough of 2025

I tried it on my car but it doesn't turn on anymore. Deceiving news
- Sounds like a 4chan prank, but... 🪦
- This turns everyone else on, though.

Oh boy! Idiot TikTok kids is going to start microwaving devices.
- didn't 4chan do that once?
  
  Yeah they tricked people into believing that Apple added something that allowed users to charge their phones by microwaving them
  
  4chan did everything once
  
  multiple times the big one was to wrap a spoon in duct tape and microwave it or boil bleach and drip alcohol in it to make crystals.
  
  Who is this "4chan"?

Who greenlit this article ?

This title is pretty bad, the paper focus is in designing new battery technologies not magically restoring capacity on the batteries we have today.
- Is the paper in the article? I couldn't find it.
  Would you be so kind as to link us?
  
  it is this one: https://www.nature.com/articles/s41586-025-08765-x

Warning: heating earbuds batteries to over 300F also causes fires
Reading this tells me the author has absolutely 0 idea of how physics work and is nothing but a blogger of consumer grade equipment. People like that should refrain from trying to understand how science or scientists work.
- Obviously, physics aren't done in Fahrenheit.
  
  Had to laugh at your comment. Not that it matters in this case, your ear buds are not going to magically combust at just 150°C
- I think you mean they shouldn't write authoritatively about things they don't understand, because what you said is really gate keepy. There's nothing wrong with learning.
  
  People shouldn't compare things to gatekeeping unless they can build a cast iron gate

Yes but how can shareholders profit from this??
- By not switching to Na based batteries and keeping a lid on Li mining.
  
  Even BYD is betting on Na tho.
- By making battery renewing devices.
  
  New ovens will only reach 280°F. But if you subscribe to LG Baking™ Plus™ plan for only $5.99*/mo, you can unlock up to 340°F for all of your essential^† baking needs! But wait, if you subscribe to LG Baking™ Plus™ Premium tier for an additional $8.99**/mo, you can unlock up to 425°F and a 20 minute timer!
  ^{* introductory rate for new customers only, 2 year contract required, promotion ends after 1 year and increases to $24.99/mo billed annually}
  ^{** promotional rate only, 5 year contract required, promotion ends after 2 years and increases to $89.99/mo, billed annually}
  ^{† "essential" is defined as items that qualify as food items that require up to 325°F. upon sensing electronic items (batteries, circuit boards, and other non-food items), the contract will be terminated immediately and any funds allocated will be forfeited to LG and its subsidiaries}

Cue dumbasses tossing their iphones in the toaster oven in 3... 2...
- Microwaving the iphone was close to the right answer.
  
  What, you didn't know you had to crank the power to high before microwaving your phone? Rookie mistake
- I love the typo because it covers so many things at once
  Queue as in they're lining up to do it; cue, as in that's their cue to be stupid; and que (spanish for what) as in what the fuck are they thinking?
  
  I was gonna say there's no typo but the comment has been edited. What was it originally? Que?
- ¿Que dumbasses?
- putting it over the stove.

I hope this article is well peer-reviewed. Otherwise this reads as if some LLM came up with the idea
- Otherwise this reads as if ~~some LLM~~ 4chan came up with the idea
  Remember kids, updating to iOS 7 enables your phone to charge wirelessly in the microwave.
- The “peer” that reviewed it was another LLM.
  
  Well if it was a human it wouldn't be a peer, would it

Is this before or after they reach the spicy pillow stage?
- The trick is to let them apply this heat themselves.
- I think before, but there’s a trick for spicy pillow just poke a vent hole, trust me I was in IT for 6 years ;p
  
  i was just thinking i could use an excuse for some skin grafts

Important note near the end of the article - they aren't saying we should cook batteries really -
"The team's hypothesis is that the structural disorder developing inside LIBs may become a “tunable parameter” that, if tweaked using chargers at precise voltages to alter said battery composition, could be used to rejuvenate the batteries in our tech without fires."
This is a good old idea that goes back to the days of desulfating lead batteries with powerful shocks of high-amperage current. Might just need a special Healing Charger that applies the right voltage/current to dissolve the bad crystals in lithium-ion systems
- I remember recovering dead 18650 cells from laptop batteries and "restoring" them with a 12V modded PC PSU. Quite a few of them actually started working again and had some capacity for a few tens of additional cycles. Those cells were never left unattended in a charger and they were always only used in a device you could chuck in a moment's notice.
  10/10 do not recommend.
  
  How did that process work? Did you just connect the +/- ends of the cell to the +/- 12v wires of the PSU and let it feed from the high-amp outputs? Imagine there's plenty of amps on the GPU and CPU power wires
- Well, there is some data/rumours out there, stemming from a Dutch Tesla forum, that suggests that some fast charging might be beneficial for battery longevity. This seems to corroborate that. I can't remember the case for always fast charging, though.
- Oh God I can already see all the questionable "Restorer Chargers" and the like from Temu that will be more likely to burn down the house...
- With electric cars you might not even need a special charger so much as a special charging cycle. Its already the norm for cars to tell the charger what voltage and current they want, and its already the norm for cars to carefully control their battery's temperature during charging.
  That's not to say you'd necessarily be able to do this with just a software update, but its not too far off from the current paradigm.
  
  Yeah that's a good point. Ours uses the same refrigerant system as the AC to cool the battery, and the actual "charger" for the battery is inside the car being controlled by its software etc. The cables that plug in on the outside are technically just power wires, with the charging brains inside the car. That would be amazing if they could update the software to rejuvenate the battery once a year or something.

Sure. But we need to see pics, or it didn't happen.
The abstract doesn't mention them re-gaining their old capacity. It only says they shrink. And something about voltage. So I have my doubts. I mean it's nice if my spicy pillow shrinks a bit. But what does that help if it continues to stay nearly dead? And an application in products would be hard to accomplish. At that temperature, all the plastic etc is going to melt. Maybe the solder as well.
- Yes. If you aren't reading any battery tech article with a huge amount of skepticism you are doing it wrong. More than any other tech sector I can think of, battery research is just absolutely plagued with low quality research that consistently gets picked up by media outlets.
  
  It might be less the quality of the research and more this:
  (This comic is a bit outdated nowadays, but you get the idea).
  Except the headlines say "scientists report discovery of miraculous new battery technology using A!".
  Also i think people don't realize how long it takes to commercialize battery technology. I think they put them in the same mental category as computers and other electronics, where a company announces something and then its out that same year. The first lithium ion batteries were made in a lab in the 1970s. A person in 2000 could have said "I've been hearing about lithium ion batteries for decades now and they've never amounted to anything", and they would be right, but its not because its a bunk technology or the researchers were quacks.
  
  Hmm, you’re right. At a guess, this field might represent the maximal combined interest of both scientific and pedestrian readership within technology research, since on the one hand energy density and storage logistics is the key limitation for a ton of desirable applications, and on the other most consumers’ experience with batteries establish them as a major convenience factor in their day-to-day.
  Edit: you’re*

so putting batteries in the fridge wasn't useful after all, we should put them in the oven
- so I can now put my spicy pillows in the oven and tell the insurance men the internet told me to?
- Putting my LG G Flex which had a boot loop problem due to a soldering issue on the battery solved the problem temporarily!
  Edit: oh also that was the freezer
  
  I've known some old people to put their bootloops in the freezer because they think it won't go stale as fast.

brb chucking my batteries in the oven
it's a cheap and easy thrill

brb, putting e-bike battery in oven
- One simple trick to make your ebike fly.
  
  turn you into ghost rider.

Sounds like a horrible idea if not carefully controlled. Perhaps up to 80 degrees in an oil bath could redissolve some of the electrolytes. I guess it could work. Anything above 100 is asking for trouble.
- So you're saying I SHOULDN'T preheat my toaster oven to 425F???
  UH-OH!!!
  brb. Gotta put out some fires.
- How is the boiling point of water relevant to something that's made of plastic and metal?
  
  Well the electrolyte solution is water based so exceeding the boiling point will cause pressure buildup inside.
  Edit: hmm seems I might be generalizing too much. Not all batteries use water based solutions. My point is that you should avoid a pressure buildup inside the battery due to reaching the solvents' boiling point.
- 80 degrees what?
  See, this is where the problems begin.
  
  heat to 80K....oh wait

this feels like bait
- In reality, this doesn’t affect the existing batteries we have, it’s just for future battery technology.

Sounds like "microwave to charge" for the modern era.

In the good ol' days when I ran out of battery and every charger had a different stupid little connector, I often put my phone on the window still or heater to get a little bit of juice to do what I needed to do.
I guess I am a scientist.
- Wow, this brought back memories of me rubbing my hands against my old Nokia battery in middle school to heat it up and get a couple extra %.
- We did the opposite, put it in the freezer
  
  IIRC freezing accelerates the chemical degradation of lithium ion (especially if you attempt to charge the battery at the same time) and tends to lower both the voltage and amperage of most battery chemistries, but it seems plausible that this might
  temporarily defeat a cell protection circuit, allowing a charging procedure to initialize, or
  delay a thermal failsafe cut-off of a damaged cell long enough to boot or charge a device
  Regardless, for those tuning in at home, best to keep your batteries out of the freezer, especially lithium types, unless spicy pillows are what you’re after.

Neat! So if I put my phone in the microwave it will reset the battery?
- Only if you want it soggy, air fryer works better
  
  So is a toaster the new wireless charging hub?

How does heat mitigate the dendrites? Also doesn't extreme heat damage the batteries? They barely hold up under high temperatures as-is.
- I think it has to do with whether or not the battery has a current going through it while hot. I imagine heat probably makes the lithium more soluable in the electrolyte liquid, then the disolved material migrates with the current flow. Heating it without a current flow might allow it to redissolve and at least distribute it more evenly so it doesn't make one long spike that shorts the battery.

Reminds me of the old days of putting my LG G4 in the freezer
- For me that was not so long ago. I still used an LG G4 as permanent car navigation until a year ago or so. I'm still surprised that one didn't end up bootlooping.
  
  Why'd you put it in the freezer if it wasn't bootlooping? Just like cold phones?

Oven, 450?
- Nah, set it to broil for optimal results /s

Thanks, climate change.

Wait, nobody came up with this before?