The Super Supercapacitor?

[techs]

http://www.youtube.com/watch?v=OtM6XJlynkk

http://www.extremetech.com/extreme/...mes-as-powerful-can-be-made-with-a-dvd-burner

Graphene supercapacitors are 20 times as powerful, can be made with a DVD burner

A team of international researchers have created graphene supercapacitors using a LightScribe DVD burner. These capacitors are both highly flexible (pictured below) and have energy and power densities far beyond existing electrochemical capacitors, possibly within reach of conventional lithium-ion and nickel metal hydride batteries.



Pop science or real world breakthru?

 

[ElFenix]

think hp would accept an RMA if i clogged up my burner with graphene?

 

[darkxshade]

Sounds very promising. DVD burners making a comeback. Would be awesome if I could "print/burn" my own batteries.



edit: Actually nvm, I'm of the same opinion with whatever Rubycon thinks. Um, yea!

 

[DrPizza]

For serious??

That's it? <resisting the urge to experiment>
That looked incredibly simple, though I'm guessing there would need to be, for starters, some firmware updates, to allow it to turn at much lower rpms.

 

[Aikouka]

They talked a bit about capacity, but what about it's natural discharge rate?

siemens per meter (yes, that&#8217;s a real unit)

I don't know whether to giggle or sigh that they included that little note in there.

 

[Mark R]

hmm.

Tetaethylammonium tetrafluoroborate/acetonitrile electrolyte.

Perhaps they could chosen something slightly less toxic, like botulinum toxin?

 

[DrPizza]

http://www.sciencemag.org/content/335/6074/1326.full

 

[Ken g6]

Somehow, I expected that they would leave the graphene on the DVD, but use the LightScribe to inscribe two thin spirals. That way the entire capacitor would be on one DVD. The trick then would be to remove the excess graphite oxide.

 

[randay]

They talked a bit about capacity, but what about it's natural discharge rate?



I don't know whether to giggle or sigh that they included that little note in there.

I wonder what tool they use to measure the discharge rate in siemens per meter?

 

[Anonemous]

http://www.reddit.com/r/videos/comments/15641i/being_able_to_charge_a_cell_phone_in_30s_is/c7jp1cc

This gives us an energy density of .00245 MJ/kg.* Which is 60 times greater than a traditional capacitor (.000 036MJ/kg) but 1/300 the density of a rechargeable lithium ion battery.

Work is exciting that they developed an easy way to produce graphene but the capacity is not there yet with Lithium Ion batteries.

 

[Rubycon]

http://www.youtube.com/watch?v=OtM6XJlynkk



Pop science or real world breakthru?

Honestly I'm more interested in the process of making graphene with a DVD-RW drive! :biggrin:

Capacitors can be charged and discharged at rates that would make any typical power cell chemistry cry uncle before their vent caps were closed at the assembly line. This is due to their extremely low internal impedance. Unlike a traditional cell they would need lots of ancillary circuitry and monitoring for both charging and charge maintenance.

Charging an EV array in a minute [sic] sounds like a novel idea until one has to realize the amount of current draw (peak) that would be required. Multiply this by a number of cars in a neighborhood and you have a hysteresis similar to a steel mill with a 75MW EAF!

I wonder what tool they use to measure the discharge rate in siemens per meter?

Siemen is a measure in conductance not discharge rate. Discharge is measured with an ammeter.

 

[techs]

Someone finally found a use for lightscribe drives!

 

[Hayabusa Rider]

Hmm...

If I mount the drive internals on a moving rail I wonder how long of a sheet I can make.

 

[Jeff7]

They talked a bit about capacity, but what about it's natural discharge rate?
...

Or worse - its maximum current if it's given a dead short.


The video said something about charging a car battery in a minute or so.

So what are we looking at then, copper cables 3" in diameter to handle amps?

Or the size of headphone wire, if anyone ever figures out room-temperature superconductors.

...
Charging an EV array in a minute [sic] sounds like a novel idea until one has to realize the amount of current draw (peak) that would be required. Multiply this by a number of cars in a neighborhood and you have a hysteresis similar to a steel mill with a 75MW EAF!
...

Yes, that.

The alternative: Size the caps so they can be fed directly from the transmission lines. Ok, so if you touch the wrong thing while servicing your car, or during charging, you'll be instant popcorn. But, you know, high voltage is more fun.
And as a bonus, set up a proper coil of wires while you're at one of these charging stations, and you can wirelessly charge your phone.

 

[techs]

A laptop that can be recharged in 10 minutes would be sweet.

 

[randay]

Siemen is a measure in conductance not discharge rate. Discharge is measured with an ammeter.

I cant even grasp the concept of conductance. If you say siemen it sounds like youre saying semen.

 

[Rubycon]

The alternative: Size the caps so they can be fed directly from the transmission lines. Ok, so if you touch the wrong thing while servicing your car, or during charging, you'll be instant popcorn. But, you know, high voltage is more fun.
And as a bonus, set up a proper coil of wires while you're at one of these charging stations, and you can wirelessly charge your phone.

Park here, 345kV charging station, "gas and go" :biggrin:

https://www.youtube.com/watch?v=zlh1ihUR6xw

 

[Aikouka]

Charging an EV array in a minute [sic] sounds like a novel idea until one has to realize the amount of current draw (peak) that would be required. Multiply this by a number of cars in a neighborhood and you have a hysteresis similar to a steel mill with a 75MW EAF!

I was mulling over this issue in the EV thread in the Garage sub-forum, and one solution that I thought of might actually work... but it has some serious downsides. Essentially, to be able to charge cars rapidly, we add another point of storage right at the end-point. My thought is that it would sort of be like the electric equivalent of a water heater... or a gigantic version of one of those mobile device chargers. The idea is that it's always connected to the grid, and that could allow it to draw power in at a slower rate to keep itself full, and you draw power from it much faster when you need it.

The biggest downside that I can think of is... cost. It would essentially require what is almost an equivalent amount of energy storage as what exists in your EV, and those batteries are stupidly expensive. People probably already balk at the idea of paying $2k for a faster charger, which gets subsidized anyway, and I can't imagine telling them that they would need to pay around $10k for a super-fast-yet-power-line-conscious charger.

EDIT:

...or... we beef the hell out of our power line system!

 

[Rubycon]

Yes essentially you have a cap charging a cap (dump bucket). Works similar to amps with loose rails and tons of storage. It can also help with longer feeders but the secondaries must be relatively short and still need to be of decent size.

Further up the distribution system would have to be beefed up. I don't think folks would appreciate having a 66kV distribution system - overhead - on their streets.

If one goes to the extent of additional grid capacity and distribution why not just make the major highways one big induction charging system? Data would also flow on these lines so people could be billed for the power used. Conventional packs would allow for driving "off grid" in typical fashion (ex. Nissan Leaf, ~75 mi range). etc.

 

[gorobei]

i like the part in the video where he dumps the used graphene into the composting pile. "its all carbon" what the hey!

 

[Red Squirrel]

This is pretty awesome. I'm going to have to try this some time. I have never actually used lightscribe, it could be cool to say that my first time using it was for science! Hopefully it would work better than the 0.2 volt hydrogen fuel cell I tried to make.

 

[randay]

i like the part in the video where he dumps the used graphene into the composting pile. "its all carbon" what the hey!

i throw away diamonds into compost heaps. hell its just carbon!

 

[EagleKeeper]

A laptop that can be recharged in 10 minutes would be sweet.

Apply to electric cars

Pull into a Starbucks and both get juiced up at the same time.

 

[Mark R]

Siemen is a measure in conductance not discharge rate.

Siemens, goddamit. Siemen makes it sound like you're trying to talk dirty or something.

It's Siemens, after Ernst von Siemens. Apparently, he once ran some engineering company or something.

 

[Darwin333]

Siemens, goddamit. Siemen makes it sound like you're trying to talk dirty or something.

It's Siemens, after Ernst von Siemens. Apparently, he once ran some engineering company or something.

You seem rather obsessed with Siemen. Do you usually do your own siemens or does someone else provide the siemens for you?