21–30 of 109 posts
Well, the graphene seems easy enough to manufacture. What are the obstacles to start using this technology right now? What is still missing?
Well, the graphene seems easy enough to manufacture. What are the obstacles to start using this technology right now? What is still missing?
Earlier quoted context omitted.
ok so here is the only real data I could find. At the end of the paper: "The LSG-EC can exhibit energy densities of up to 1.36 mWh/cm3 , a value that is approximately two times higher than that of the AC-EC" 1.36 mWh/cm3 = 1.36 Wh/L If we assume that 1 L of it weights very roughly 1kg. We get 1.36 Wh/kg. From wikipedia: "The amount of energy stored per unit weight [in ultracapacitors] is generally lower than that of…
There is a big miscalculation: Graphene seems to be extremely light weight. 1 liter of graphene will definitely not weight 1kg. Wikipedia [1] only gives measures for m²: Graphene is very light, weighing only about 0.77 milligrams per square meter. [1] https://en.wikipedia.org/wiki/Graphene
[1]: http://www.strem.com/uploads/resources/documents/graphene_na...
I don't know much about the technology of this, but I used to play with capacitors during my teenage years and if this works even half as advertised it would be truly life altering. We could have "hybrid" solutions of a capacitor combined with a battery with the capacitor acting as a buffer to improve battery life.
I'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.
Am 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.
My plan is to sell Lightscribe DVD drives and graphite oxide, like the store that sold shovels to gold miners.
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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…
Your inductive charging tray tables are terrible for my magnetic tapes and floppy disks. Also, where does it get its energy from? It's much more efficient to walk around with wearable solar panels or to embed them directly into the devices. It may not work well on the north pole half the time but batteries aren't very conductive in those environments, anyway.
Earlier quoted context omitted.
Your inductive charging tray tables are terrible for my magnetic tapes and floppy disks. Also, where does it get its energy from? It's much more efficient to walk around with wearable solar panels or to embed them directly into the devices. It may not work well on the north pole half the time but batteries aren't very conductive in those environments, anyway.
When was the last time you walked around with a magnetic tape or floppy disc? Now - what happens if you put your wallet full of credit cards on it?