Neutrons explain aging process in lithium ion batteries.
Full article here: https://www.tum.de/en/about-tum/news/press-releases/short/article/32745/
A bit over my head, but I’ll read it again. Interesting article, thanks for posting.
I guess you’d want to put the li ion battery further from the engine, if in a car? Is that what a priest does?
We saw this two years ago, seems to be the same conclusions:
Not much new under the sun...
There are new discoveries every week (often every day) in battery and energy technology, how many are game changing and commercializable, less then 0.1%
I’m not saying advances never happen and never reach the consumer level, i am saying there are “breakthroughs” quite frequently, and over 99% of them fizzle out, one i used to follow is
http://www.technologyreview.com/energy/stream/
Read their last 5 years of posts.
But if you search for other sources you will see many, many, many, many more discoveries that are never heard from again.
Just compare the advances in LED technology in the last 5 years and then compare that to the advances in Li Ion technology.
Lately any advances in Li Ion have been incremental
LED has been amazing though, in 5-10 years i expect 200 lumen/watt bulbs, instead of the 60-80 we have today.
I’m with Bort on this one.
Read the article and what does it say?
It says that high charge-discharge voltages and temperatures are the primary causes of lifetime capacity loss. Not exactly new news.
But I bet most folks here will not make the distinction that they are not using !@#%fire 18650 cells in their tests (but may falsely conclude that it is now OK to go to 4.4 or 4.6v because those numbers look familiar, but”better” n what even 18650’s happen to be in their collection). And therein lies the rub, the start of poorly founded decisions that can lead to unnecessary suffering for the ill informed.
“They deployed these methodologies to analyze the behavior of batteries with graphite anodes and nickel-manganese-cobalt cathodes, so-called NMC cells, at various temperatures. NMC cells are popular in electromobility since they have a large capacity and can theoretically handle charging voltages up to just under five volts. However, above 4.4 volts aging effects increase strongly.
The research group determined two key mechanisms for the loss of capacity during operation: The active lithium in the cell is slowly used up in various side reactions and is thus no longer available.* The process is very temperature dependent*: At 25 °C the effect is relatively weak but becomes quite strong at 60 °C.
When charging and discharging cells with a higher upper cut off potential(4.6 V), cell resistance increases rapidly. The transition metals deposited on the anode may increase the conductivity of the pacifying layer and thereby speed up the decomposition of the electrolyte.”
So to be BLUNT please if you have NMC 18650 cells feel free to “overcharge” them. BUT if your Cell is NOT NMC OR YOU DON’T KNOW please think.
A San Francisco cop with little regard for rules
Excellent,
Well don’t be shy please tell us? As I am not a CE or EE maybe you can help explain it?
Always up for new interesting stuff that matters to us.
Whether this is old news or new news doesn’t change the fact that the article leaves out a lot of important information, like what they’re doing to fix the situation. The “Perpetual Youth” part of the title wasn’t represented at all in the article.
The one thing I did learn was that Lithium is lost in the cell degradation process. It goes away. Sounds to me like we need refillable Li-Ion cells now!
No, Li is NOT lost. It has no way out. It is just converted into forms/chemicals that are useless for making electricity, and even worse, into forms that hinder charging/discharging.
Also advances in LEDs, just like batteries, have been pretty much incremental for years now… and will most likely remain that way. There are no major breakthroughs in sight…