Grounded in Reality, Maxwell Technology’s CEO Dispels Static Around Ultracapacitors

Is it just me, or have ultracapacitors somehow become the latest hot and mysterious alternative energy technology?

Just a few weeks ago, my Xconomy colleague Greg Huang reported that Seattle startup EnerG2 landed $8.5 million in venture funding to develop a new class of ultracapitors that use nanocomposite materials to store energy. Before that, Light Electric Vehicles of Eugene, OR, announced that EEStor, a secretive company in Cedar Park, TX, would supply ultracapacitors next year for LightEV’s two- and three-wheel vehicles. Then I noticed that one of three finalists in a $25,000 contest organized on YouTube to solicit ideas for a new “Energy X Prize” was a proposal to create a new storage medium—an “ultracapacitor.”

This fascination may be due to the fact that the technology is akin to catching lightning in a bottle—literally. An ultracapacitor is an electronic device used to store electrical energy. It can charge and discharge electricity almost instantaneously, albeit at low voltage, hundreds of thousands of times without being depleted.

Now it just so happens that a San Diego company called Maxwell Technologies (NASDAQ: MXWL) has been developing ultracapacitors for the past 15 years. So this flurry of recent announcements left me confused. Doesn’t the technology needed to make ultracapacitors already exist?

So I arranged to talk with David Schramm, the CEO at Maxwell, which has been manufacturing ultracapacitors for commercial customers for the past seven years or so. And I asked: What do these recent announcements mean? Is the big breakthrough in ultracapacitors yet to come?

“I have a hard time shadow-boxing against some of these things, I don’t know where to start,” Schramm says. “It’s one thing to write on a piece of paper what you’re going to do, and it’s another thing to work with people who have actually done it.”

Maxwell, which was founded as a government R&D contractor in 1965, inherited its expertise in ultracapacitors from working on power sources for pulsed lasers at the Lawrence Livermore National Laboratory. Maxwell decided to focus on developing ultracapacitors for commercial markets in the early 1990s, as defense spending plunged in the years following the dismantling of the Soviet Union. But making money from ultracapacitors has been a challenge for Maxwell, and the company has been continually reinventing itself for the past 10 or 15 years.

One problem, Schramm says, is that the industrialized world … Next Page »

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Bruce V. Bigelow is the editor of Xconomy San Diego. You can e-mail him at or call (619) 669-8788 Follow @bvbigelow

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  • Sorry the article is so general. I wish you had specifically discussed barium titinate, which EESTOR uses. Sounds like a typical not-invented-here defensiveness.

  • Krassen Dimitrov

    Mr. Blakeslee,
    if EESTOR can deliver at scale it will indeed be the game changer, considering that what they have demonstrated translates into effective volumetric energy density equaling that of gasoline. (essentially, an EESTOR capacitor could fuel a car the same distance as would a tank of gasoline with the same volume. The nominal energy density is five times lower, however, an EV is 5x more efficient than an ICE-based car. Also, even though the volumes will be similar, the barrium titenate capacitor will be 10x heavier, but that’s not so important)

    However, some of the points that the Maxwell’s CEO makes are valid. It is indeed a “lightning in a bottle”, as these capacitors have low surface area and the high energy density comes from the extremely high potential (~1500V). EESTOR better deliver a well developed discharge circuitry with their product or not many would dare design around something giving you 1500V.

    Best wishes,