TeraWatt’s solid-state battery prototype achieves energy density of 1,122 Wh/L

Silicon Valley startup TeraWatt Technology has announced that its prototype 4.5 Ah solid-state battery design achieved a record-breaking energy density of 1,122 Wh/L (432 Wh/kg) in validation tests conducted by third parties, including the Japanese testing service TOYO System.

TeraWatt says this 4.5 Ah design, which is branded as TERA3.0, will be available for select early adopters in 2021 and for full release in 2022. The company continues to further iterate the TERA3.0, and is developing additional designs, including different cell formats, sizes and energy capacities.

TeraWatt Technology was established in 2017 as a division of SF Motors (dba SERES), a transportation tech company with headquarters in Santa Clara, California. The team has opened itself to strategic partnerships and external investment.

SERES Senior Manager Ken Ogata said, “TERA3.0 is a significant step beyond the traditional lithium-ion solutions that have dominated for the past 30 years. Through our solid-state technologies, consumers will be enjoying longer-lasting, safer and more reliable devices sooner. Since TERA3.0 is designed for mass production using current lithium-ion production equipment, we can accelerate mass adoption without imposing a massive financial burden to manufacturers and consumers.”

Source: TeraWatt Technology via Green Car Congress

  • dougt

    Great. What is the power density? What C rate can it be charged/discharged at? What is the cycle life? That will determine the applications it can be used on

    • Jehan Kateli

      And most importantly, how much will it cost to manufacture?

    • UKGary

      If the power density is low, this can be overcome easily with a modest amount of ultracapacitors.

      • dougt

        For an EV it would take an enormous number of supercaps to just do 0-60. The money, weight and volume aren’t worth it. They might as well buffer with high C batteries

      • freedomev

        No it can’t economically.
        Fact is lithium-ion would be far better to buffer it at a tiny fraction of the 30x the cost, weight, space an UC would need to do the same thing.
        Maxwell sold off because they couldn’t sell enough UCs as once people saw the numbers, they said never mind.
        And UCs need special expensive electronics to use them since their voltage goes to 0.

      • Luke William

        Well there goes your energy density then. That’s not a solution. That’s a crap bandaid.

    • John

      Cycle life is critical to real world applications. They conveniently didn’t mention it…

    • Raymond Smith

      Sure does bro. Let’s hope this one is not also just a fab, here today history tomorrow.

  • Richard Gieser

    Would have been nice to include some typical numbers of energy density of batteries in use today for comparison.

    • Laureen Hobbs

      Claimed density is 75% over Tesla’s 2170. And that’s in 3 years, by that time Tesla will probably have a new improved generation of battery cells

  • Paul Rice

    So….. are you saying that my new Tesla will cost just $600 dollars

    • rayechevarria

      Just buy the battery. That car is free.

      • Pete McWade

        Like your printer. But our ink get the printer for free.

  • SJC

    Charge rate and cycle life are important, without that data there is no accurate evaluation.

  • ProDigit

    I think the biggest question is, how many rechargeable cycles does this thing have?
    The problem with most solid state batteries is they break down quickly, most not capable of 100 recharge cycles!

    • Russell Jones

      The Fully Charged channel on YouTube looked at a solid state battery last year in development that could withstand more than 1 million cycles. To be honest, I’ve not heard of any that are less than 1000 cycles.

      • ProDigit

        The problem in the past is that solid state batteries were based on silicon, and the silicon layers deteriorated pretty quickly with every charge/recharge. Not sure this is any different.

  • Richard Gieser

    I think John Goodenough’s new battery has this one beat all around.

  • onlineo

    432wh/kg is good, but i was expecting them to be 5-10 times more dense than current li ion batteries. I think Tesla were at 247wh/kg last time numbers were published. I believe that Tesla batteries will be 300wh/kg + before they release the Tesla Semi, so possibly within a year.
    As others have said until we know other properties of these solid state batteries then we don’t know how relevant they will be for EVs. Anyhow it will probably be a long time until they are cheap enough for mass market EVs, but I can already visualise a 200kwh pack going into a Model S/X in 3-5 years time.

    • Laureen Hobbs

      200kwh in S/X not happening. If they can reduce the weight of the battery/wiring, everyone will be satisfied with just the additional range and improved handling.

      • onlineo

        I imagine it may happen one day, but not before the 2024 roadster.

      • Pinewold

        At 500 miles of range, nobody should have range anxiety. With a 75% improvement, you could have 15% fewer batteries and have 500 miles of range.

  • Slavo

    I can also make a battery double this capacity… but the cost… 1 M/kWh…

  • Luke William

    Is this the jellyroll energy density or the package?

  • wiseoldfart

    I’d be happy with a solid-state battery that allows an EV to weigh no more than a conventional vehicle. I would expect a range of over 250 miles on a 5-7 minute recharge, of course. There will have to be enough charging stations wherever I plan on traveling to make waiting in line for a recharge a rare occurrence. I won’t mind if the initial cost is a little higher than today’s EV’s. It would have to be produced by a major Japanese manufacturer or perhaps Hyundai/Kia to attract my money and trust. Until that day arrives, I’ll be relying on gasoline.

  • EVman88

    What is the life cycle. Busted

  • Pete McWade

    Don’t forget, it is still a prototype.