Posted on 02/07/2021 3:17:14 PM PST by mabarker1
Waste fibers from hemp crops out-perform graphene for a thousandth of the cost, according to new research
Is there anything hemp can’t do? A year after hemp became legal to grow in the United States, we’ve seen its power to make better clothing, better buildings and better medicine.
Now, there’s something else hemp appears to be better at – making batteries.
Most auto batteries today are made from lithium-ion, an expensive, quickly disappearing material.
A team of American and Canadian researchers have developed a battery that could be used in cars and power tools using hemp bast fiber – the inner bark of the plant that usually ends up in landfill.
They “cooked” the woody pulp and processed them into carbon nanosheets, which they used to build supercapacitors “on a par with or better than graphene” – the industry gold standard.
Graphene is a synthetic carbon material lighter than foil yet bulletproof, but it is prohibitively expensive to make.
“We’re making graphene-like materials for a thousandth of the price – and we’re doing it with waste.”
Mitlin, a professor of chemical engineering at Clarkson University in New York, first published a description of his team’s battery in the journal ACS Nano in 2014.
More recently, a YouTuber named Robert Murray Smith, whose channel is all about batteries and put the hemp battery to the test against a lithium-ion battery and found it to be 8 times more powerful!
Tesla’s new million-mile battery is made from lithium-iron phosphate, which is supposed to last twice as long as conventional lithium-ion batteries.
While more abundant and cheaper than lithium-ion, lithium-iron-phosphate still can’t compete with the apparently far-more-powerful (and renewable) hemp!
IOW, all this talk about hemp gives you the munchies, huh?
Sure there is. Let it grow in the road ditches like it used to before the feds ordered it cut to not conceal pot. Restore lost habitat and sport hunting at the same time.
I couldn’t keep the dammed thing lit!
Nope, it’s Chicken Broccoli Fettuccine Night !!!
It’s industrial hemp. You can smoke a joint the size of a log and not get a buzz.
they must be high powered...
BULL. Why is pseudo-scientific stuff like this allowed to be posted here?
I’m sorry I offended anyone, I will be sure to get Clearance from All of Y’All before I Post any more Threads so I don’t waste Y’Alls time again...
Zzzeeesh, some people just get too uptight.
Try and have a nice evening...
They ARE goobers, y'know.
Sounds yummy!
I’m guessing zero, since hemp doesn’t have THC.
“The pot propaganda is strong in this one...”
Hemp is not pot.
“It’s industrial hemp. You can smoke a joint the size of a log and not get a buzz.”
After all this time on FR, what’s the point in trying to explain it?
I just try to figure out things that seem too good to be true.
I hope you enjoy posting.
Nobody is forcing anyone to read anything posted.
Energy density vs power density. Energy density is needed for long range. Power density is needed for regenerative braking and energy recovery. The energy it takes to accelerate a full sized sedan from 0 to 60 mph is only 200 watt hours. Conversely it takes the same energy to slow to zero from that same speed. Hybrids get such great mileage in city traffic recovering that energy that would be dissipated as heat in the friction brakes. This energy recovery doubles the mileage of a hybrid in stop and go traffic compared to a straight ICE of comparable size. 200wh is only 16 kilos for 100 % recovery in a hybrid. If it’s cheap to make “cooking” is pyrolysis under pressure with no oxygen not an expensive process at all. They are making structured high surface area carbon from plant based carbon chains. Also of interest would be cycle life super capacitors have cycle life measured in the hundreds of thousands of full depth of discharge vs 5000 of lithium ion. With those kinds if cycle life you could do a charge optimised hybrid run cycle. It takes one kWh to send a full-size Tesla 4 miles a 250 kg pack would hold 3kWh of juice enough for 12 miles of all electric driving. The engine would be run at its most efficient point to charge up the pack then shut down for a 12 mile cruise then on again for 12 more miles ect. An Atkins cycle hybrid engine such as in the Prius has a peak efficiency of 43% gasoline to electricity. That’s 60 mpg (114,000btu lhv of petrol*0.43/3414 by/kWh) in a full sized car not a Prius sized car. In a small Prius sized car at 6 miles to the kWh it’s 85 mpg tank to wheels. Since the Super capacitors can take so many cycles you can only run the engine at its peak efficiency to charge the pack intermittently. Put this in perspective the avg American as in 92% percent verified by the DOT commute 35 miles or less each day. The engine would run 3 times to cover that distance while getting over 60 mpg for the trip. Being able to charge at home and work would cut that to twice each way. The Prius motor system is 99PS or 73kw to put 3 kWh into the Super capacitors would take 2.46 minutes of run time at 73kw output. Which means to cover 35 miles the engine would only run three times for 2 and a half minutes each time at peak efficiency. That is the value of high density Super capacitors
So, what do they call the Hemp Industry? Big Joint?
I understand the difference.
Lots of work on super-capacitors going on.
The idea that "hemp" has much better structure than anything else seems unlikely.
The article called the laboratory device a battery and compared it to Lithium Ion.
As you noted, it is a supercapacitor.
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