Posted on 10/06/2022 1:18:00 PM PDT by Red Badger
An electrode was manufactured by coating an ion conductive layer composed of polyethyleneimine polymer, silver, lithium salt, and carbon black on the surface of a copper current collector. The ion conductive substrate fabricated this way can operate the battery by effectively receiving and releasing lithium ions during charging and discharging. Credit: POSTECH
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The number of newly registered electric vehicles (EVs) in Korea surpassed 100,000 units last year alone. Norway is the only other country to match such numbers. The core materials that determine the battery life and charging speed of now commonly seen EVs are anode materials. Korea's domestic battery industry has been committed to finding revolutionary ways to increase the battery capacity by introducing new technologies or other anode materials. But what if we get rid of anode materials altogether?
A POSTECH research team led by Professor Soojin Park and Ph.D. candidate Sungjin Cho (Department of Chemistry) in collaboration with Professor Dong-Hwa Seo and Dr. Dong Yeon Kim (School of Energy and Chemical Engineering) at Ulsan Institute of Science and Technology (UNIST) have developed anode-free lithium batteries with performance of long battery life on a single charge.
The newly developed anode-free battery has a volumetric energy density of 977 Wh/L which is 40% higher than the conventional batteries (700 Wh/L). This means that the battery can run for 630 km on a single charge.
Batteries usually change the structure of anode materials as lithium ions flow to and from the electrode during repetitive charging and discharging. This is why the battery capacity decreases over time.
It was thought that if it was possible to charge and discharge only with a bare anode current collector without anode materials, the energy density—which determines the battery capacity—would increase. However, this method had a critical weakness which causes significant swelling of the anode volume and reduces the battery lifecycle. It swelled because there was no stable storage for lithium in the anode.
To overcome this issue, the research team succeeded in developing an anode-free battery in a commonly-used carbonate-based liquid electrolyte by adding an ion conductive substrate. The substrate not only forms an anode protective layer but also helps minimize the bulk expansion of the anode.
The study shows that the battery maintained high capacity of 4.2 mAh cm-2 and high current density of 2.1 mA cm-2 for a long period in the carbonate-based liquid electrolyte. It was also proven both in theory and through experiments that substrates can store lithium.
Further, what's drawing even more attention is that the team successfully demonstrated the solid- state half-cells by using Argyrodite-based sulfide-based solid electrolyte. It is anticipated that this battery will accelerate the commercialization of non-explosive batteries since it maintains high capacity for longer periods.
The study was recently published in Advanced Functional Materials.
Explore further
Reactive electrolyte additives improve lithium metal battery performance More information: Sungjin Cho et al, Highly Reversible Lithium Host Materials for High‐Energy‐Density Anode‐Free Lithium Metal Batteries, Advanced Functional Materials (2022). DOI: 10.1002/adfm.202208629 Journal information: Advanced Functional Materials Provided by Pohang University of Science & Technology (POSTECH)
A good chunk of my career was spent without touching most of what I learned. There are way too many people in corporate IT that have no formal Comp Sci education. That dumbs down entire organizations since someone needs to maintain systems and if it is incomprehensible to the lowest common denominator then it’s not maintainable. Most of my fun work was back in the 80’s and early 90’s when system programmers were still needed for performance reasons.
Me neither. But your comment about how "base ten makes sense" struck me as interesting, in connection with SI units.
Googling for SI units in other than base-10 representations yielded zip, so that got me thinking...
Would be a good question for a computer science class.
Not for long. From the first comment at the source:
"Their supplemental material which is free to access seems to suggest a loss of 40% of capacity in just 50 charging cycles, which is quite terrible."
Ouch. Not ready for prime time, for sure.
“Maybe you can enlighten this moron.
How does an “anode free” battery get an anode that needs to be protected from bulk expansion? And why if it’s anode free?”
I’m guessing it is a lithium battery with the anode material uses no lithium in its construction therefore it is a lithium battery with a lithium free anode. Not a anode free battery. You must have an anode in a battery so you have a place to hook up the red wire.
I think it was a bad written article.
Compare a 15 year old EV with your 15 year old ICE vehicle.🤔
” And why if it’s anode free?”
Because there is no active anode material.
Google “anode free battery. Many informative articles.
could be a non-binary battery.
Yikes!😱
“Speed of light in octal: 2.167474112x1011 m/s..”
Nope. You posted a number in base 10’
“Because there is no active anode material.”
So there’s a passive anode? Am I supposed to guess that? And is a passive anode not an anode?
I stand by my original comment.
“I have never seen that one before. :)”
Don’t believe all you see on the internet.
I should clarify.
As in a 1 km is just 1000m, or 100 cm is 1 m.
Everything increases or decreases with respect to tens.
But for some reason 1 mile is 5280’.
I, of course, can do either being raised with the English system.
What’s the cost for a car size battery?
What’s the battery life?
What’s the recharge time?
What’s the recharge cost?
““The Bar” (gasoline) is 9300 Wh/L”
Most of that is lost as waste heat.
“You must have an anode in a battery so you have a place to hook up the red wire.”
Of course otherwise you’d have an open loop and no current flow.
“I think it was a bad written article.”
Like most science articles written for mass consumption.
Well, I’m not going to do the math. I don’t use octal speed of light in the utility business too often...
” You must have an anode in a battery so you have a place to hook up the red wire.
I think it was a bad written article.”
Anode-free refers to a battery that has no active material in the anode thus greatly reducing required volume.
“Like most science articles written for mass consumption.”
I see you also are quick to criticize on subjects that you have no understanding.
Wrong.
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