Another Tesla thread...

Discussion in 'Hangar Talk' started by Mtns2Skies, Feb 13, 2019.

  1. Mtns2Skies

    Mtns2Skies Super Moderator Management Council Member PoA Supporter

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    Alright, can someone explain to me why Tesla (and other EV manufacturers) elect to use batteries vs. Super Capacitors?

    The appeal I see to supercaps is that there is no change in lifestyle to use them, assuming comparable range. Show up to the electric station, plug in, charge up for 1-5 minutes and you're on your way, much like normal fuel.

    While I understand that batteries have superior energy density currently, with the amount of money Tesla has poured into battery research, surely if that instead were put into super capacitor research they would be nearly equivalent in capability?

    I'm sure I'm making wildly incorrect assumptions, so please educate me so I can put my mind at ease.
     
  2. Raymo

    Raymo Pre-takeoff checklist

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    Looks like cost is the primary concern, looking at this site. Plus the capacitor will self discharge. Used in combination seems to be the way to go.
     
  3. Kenny Phillips

    Kenny Phillips Pattern Altitude

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    Capacitors also have constantly changing voltage; from the second they are finished charging, it's going down. You need to add electronics to keep your motor voltage at required levels.
     
  4. GeorgeC

    GeorgeC Pattern Altitude PoA Supporter

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  5. deonb

    deonb Pattern Altitude PoA Supporter

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    The very best theoretical SuperCapacitor right now is 10 times larger (physically) than the worst Li-ION battery. If you put that in a Tesla you'll get around 30 miles of range at best.

    It's not that Tesla is ignoring them - Elon's PhD was going to be in SuperCapacitors. I'm sure he would love to use them, but the tech isn't there yet.

    All of Tesla's research has made a battery mostly cheaper and a little better - maybe 50%. A SuperCapacitor that's 50% better would still be useless. At this point, it needs discovery, not just engineering. Universities are better suited for that kind of research.
     
  6. EdFred

    EdFred Touchdown! Greaser! PoA Supporter

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    You know what makes an excellent capacitor?

    Hydrocarbon chains.
     
  7. flyingcheesehead

    flyingcheesehead Touchdown! Greaser!

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    It'll happen eventually, but it's definitely still in the research stage, and not ready for practical use.
     
  8. 3393RP

    3393RP Pattern Altitude

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    The general public has been bamboozled into this state of mind. "Someday" batteries will magically gain 10X the current energy density, and super capacitors will become ubiquitous.

    The results of scientific efforts in the last decade indicate otherwise.