A scientific accident that could change the world
1–10 of 109 posts
Re: A scientific accident that could change the world
#2Well, the graphene seems easy enough to manufacture. What are the obstacles to start using this technology right now? What is still missing?
Re: A scientific accident that could change the world
#3I'd love to see this technology being incorporated into Tesla's batteries. With super-fast and long lasting charges their cars might become viable in countries where charging stations are either incredibly rare or nonexistent.
Re: A scientific accident that could change the world
#4Conspicuously missing is any mention of energy density. Who cares about power density. That's juste how fast it can discharge. We don't need capacitors that can discharge faster. All capacitors are already much better than batteries with respect to power. We need capacitors that can store more energy. Capacitors typically suck at that and this article doesn't give any indication that these new ones are better.
Re: A scientific accident that could change the world
#5Conspicuously missing is any mention of energy density. Who cares about power density. That's juste how fast it can discharge. We don't need capacitors that can discharge faster. All capacitors are already much better than batteries with respect to power. We need capacitors that can store more energy. Capacitors typically suck at that and this article doesn't give any indication that these new ones are better.
Here's a page which provides a bit more information than the OP:
http://www.engineer.ucla.edu/newsroom/more-news/archive/2012...
And here's a paper on the subject: http://evmc2.files.wordpress.com/2013/02/laser-scribing-of-h...
Re: A scientific accident that could change the world
#6Conspicuously missing is any mention of energy density. Who cares about power density. That's juste how fast it can discharge. We don't need capacitors that can discharge faster. All capacitors are already much better than batteries with respect to power. We need capacitors that can store more energy. Capacitors typically suck at that and this article doesn't give any indication that these new ones are better.
In the comments they mention about 1/4 the energy density of a lithium ion battery, so yes they don't compete on that measure. But full charging can happen in a minute or two, and you could top up a charge in seconds. Perhaps public areas would have inductive chargers on the wall; you'd just walk over and hold your phone or tablet up to it for a few seconds. Airline tray tables could have an inductive charger built in.
Higher energy densities aren't without issues, as Boeing found out with their 787. A battery like that is basically an explosive and it can be tricky to manage.
Re: A scientific accident that could change the world
#7Am I the only one to think "hey, I could try this at home?" 1) prepare carbon slurry 2) pour on dvd 3) etch with LightScribe DVD drive... 4) Peel of graphene layer ...?
I wonder what, exactly, goes into the carbon slurry and if it's necessary to etch a particular pattern with the LightScribe.
Re: A scientific accident that could change the world
#8Am I the only one to think "hey, I could try this at home?" 1) prepare carbon slurry 2) pour on dvd 3) etch with LightScribe DVD drive... 4) Peel of graphene layer ...? I wonder what, exactly, goes into the carbon slurry and if it's necessary to etch a particular pattern with the LightScribe.
I'm right there with you. I've been looking around to see more details on the process. Besides getting ahold of the materials, i think the most difficult part would be taking a graphene sheet and actually making it a supercapacitor. I think it requires layering it between some sort of electrolyte sheets right?
Re: A scientific accident that could change the world
#9Am I the only one to think "hey, I could try this at home?" 1) prepare carbon slurry 2) pour on dvd 3) etch with LightScribe DVD drive... 4) Peel of graphene layer ...? I wonder what, exactly, goes into the carbon slurry and if it's necessary to etch a particular pattern with the LightScribe.
I'm right there with you. I've been looking around to see more details on the process. Besides getting ahold of the materials, i think the most difficult part would be taking a graphene sheet and actually making it a supercapacitor. I think it requires layering it between some sort of electrolyte sheets right?
Yes, sounds right. Quoting from the paper cited above "Thus, a device can be readily made by
sandwiching an ion porous separator [Celgard
3501 (Celgard, Charlotte, NC)] between two
identical LSG electrodes."
Re: A scientific accident that could change the world
#10Conspicuously missing is any mention of energy density. Who cares about power density. That's juste how fast it can discharge. We don't need capacitors that can discharge faster. All capacitors are already much better than batteries with respect to power. We need capacitors that can store more energy. Capacitors typically suck at that and this article doesn't give any indication that these new ones are better.
In the comments they mention about 1/4 the energy density of a lithium ion battery, so yes they don't compete on that measure. But full charging can happen in a minute or two, and you could top up a charge in seconds. Perhaps public areas would have inductive chargers on the wall; you'd just walk over and hold your phone or tablet up to it for a few seconds. Airline tray tables could have an inductive charger built i…
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