Tesla CEO Thinks Capacitors Will Power Future Electric Cars

One of the biggest issues holding back not just electric vehicles but mobile consumer electronics as a whole is the lack of breakthrough developments in battery technology. According to Tesla Motors CEO Elon Musk, that could change with a move away from battery technology altogether, into the realm of the humble capacitor.

Speaking at the Cleantech Forum in San Francisco last month, Musk announced that it wouldn't be battery technology that pushed the electric car forward, but capacitor technology:

“If I were to make a prediction, I’d think there’s a good chance that it is not batteries, but capacitors.”

Capacitors are already in everyday electronics, used as devices for storing electric charge. At its most basic, a capacitor consists of two conductors separated by a non-conductive region, that is able to deliver quick bursts of power. They can also be charged and discharged many times more than a battery without wearing out the materials inside.

Obviously this would be hugely beneficial to the electric vehicle industry. A supercapacitor that can deliver enough power to a vehicle to allow it to travel large distances that doesn't need to worry about degrading battery performance would be the Holy Grail of EV power.

The CSIRO is actively working on supercapacitor technology, and claim there are plenty of benefits for using them in electric and hybrid vehicles:

Supercapacitors offer many benefits: • They can be recharged very quickly (in a matter of seconds) • When fitted alongside a battery can extend battery life by up to five times by 'levelling out' high power demands on the battery (load levelling) • They can be manufactured in any size and shape • They can be retrofitted onto existing designs • The devices are generally made from low-toxicity materials.

We're still a little while away from seeing batteries fall by the wayside in a supercapacitor revolution. A more likely scenario is that we'll see these capacitors used in conjunction with smaller batteries to improve battery performance in electric and hybrid vehicles.

According to Professor Gerhard Welsch from Case Western Reserve University, capacitors have the ability to deliver and absorb energy faster than a battery. Speaking to Gizmag last year, Welsch claimed:

“Electric vehicles need power inverters to convert battery power into higher voltage AC power for their electric motors and to harvest braking power.”

Having capacitors eliminates the need for inversion as they can deliver the energy at high voltages efficiently.

While we're destined to be waiting for supercapacitors to truly step up and solve the energy problem in electric vehicles, it's good to know that even though we're currently stuck with Lithium based batteries as a power source, there's a pretty impressive solution not too far away.

[via GigaOM, GizMag, CSIRO]



    Why don't they put a in flux capacitor to power their cars?

      hehehe I got into a fight with a guy at work cos he thought it was pronounced 'capacitator' stil thought i was wrong when I showed him a dictionary entry for it too...

      Because the only place you can get the necessary 1.21 Jiggawatts of energy is from plutonium stolen of Lybians.

        let's doeet!!

    Wow... Taken this long to wake up have they.
    Not only are they faster to charge, but they can throttle the charge rate and time it to use power in very low peek time on demand, allowing energy providers to balance their loads very effectively.
    The only downside is the ability to discharge very quickly and violently, think rail guns and you will get the picture, but wow the performance on demand from very small packs will be astounding. Even if used in hybrid setups, caps will be the next stage worth looking at.

      Bow to your superior knowlege do I... but...
      surely the major downside is that they have an incredibly low energy density and are therefore completely unsuitable for now for the applications we want to use them for. Here's hoping for a breakthrough.

      to solve the problem of instant discharge they should have 10s of 1000s of small capacitoors in some sort of array that makes them discharge one by one, therfore providing a constant flow of power to the motor

    Even a petrol tank can discharge it's energy explosively if released all at once.
    A cap discharge would be less spectacular.

    The current problem is the power density, take for example the typical AA battery - it has a power density of 1A/Hr (Approx), that is 1A for 3600/Seconds. A 4000F SuperCap is approx 5-inch in diameter and 6 inches tall can store 4000Amp/Seconds

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