5 ms·
> While the discharge capacity of SSAB-PDBM reduced to 44% after 30 cycles, by increasing the proton-conductive polymer content of the negative electrode, the r
by skykooler 3y ago
> While the discharge capacity of SSAB-PDBM reduced to 44% after 30 cycles, by increasing the proton-conductive polymer content of the negative electrode, the researchers could significantly improve it to 78%.
That's still a 22% drop in capacity after only 30 charge cycles; this system has a long way to go before becoming a practical battery.
- fbdab103 3y agoWhile probably not ideal for a phone or car, it could still have its uses. So long as it stabilizes at that 70%+ region, that is not potentially a deal-braker for grid installations. Which is an optimization of installation cost, maintenance, longevity, operating temperature/pressure requirements, charge/discharge rates, etc.
- DennisP 3y agoThey didn't say it stabilizes, though. You'd think they'd mention that if it did.
- idontwantthis 3y agoIf it stabilized then it would just be 30% heavier. I doubt it stabilizes.
- trompetenaccoun 3y agoDepends one the cost and environmental impact. I don't know anything about the compounds they used and anyway they're still experimental and could be replaced by others. But in stationary settings where size isn't an issue they can lose substantial capacity upfront and still be viable if they can be cheaply produced and don't involve complicated steps like in lithium mining for example.
- HPsquared 3y agoFlow batteries are better suited for stationary applications, I think. Liquids lend themselves to large-scale processing.
- Turskarama 3y agoFlow batteries are pretty good but I think if the dirt cheap "heavy" chemistries such as liquid metal and iron-air take off then not needing any moving parts and having no risk of leaks is an advantage.
- scandum 3y ago> the coulombic efficiency of SSAB-PDBM was 84% at 4 C rate, which gradually decreased to 66% at 101 C rate. Lithium batteries are over 95% efficient, so a long way indeed. Since the battery contains water, I assume it doesn't work below 0 C.
- elcritch 3y agoIt's a solid electrolyte battery, not water electrolyte based.
- pengaru 3y agoThere's clearly h2o leaving the oxygen positive electrode in the illustration at the top of TFA If the h2o ices up on that side, what happens to the battery? or is it not possible?
- tzs 3y agoI don't think 4 C and 101 C are referring to temperature. In battery charging/discharging 1 C is the current you would get if you could discharge a fully charged battery in 1 hour at a constant current. If a battery's stated capacity is say 2000 mAh then 1 C for that battery is 2000 mA. Recommended discharge and charge (if applicable) rates are usually specified in terms of C. For example the usual recommendations for charging Panasonic Eneloop batteries is 0.5 - 1 C. So if you are charging an AA which has about 2000 mAh capacity that would be 1000 - 2000 mA, but if you were charging an AAA which has something like 900 mAh capacity that would be 450 - 900 mA.
- dtx1 3y agoJust for Context thats roughly an order of magnitude worse than current lithium ion and almost 2 orders of magnitude worse than lithium iron phosphate.