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TeraWatt Technology solid-state battery prototype tests showing 432 kWh/kg

TeraWatt Technology announced that its 4.5Ah prototype solid-state battery design achieved a record-breaking energy density of 432Wh/kg (1122Wh/L) in validation tests conducted by third parties, including TOYO System based in Japan.

Branded as TERA3.0, this 4.5Ah next-generation design will be available for select early adopters in 2021 and full release in 2022. TeraWatt Technology continues to further iterate the TERA3.0 line of design, as well as further develop additional designs including different cell formats, sizes and energy capacities.


TeraWatt Technology was established in 2017 as a division of SF Motors Inc. (d.b.a. SERES), a global transportation technology with headquarters in Santa Clara, California, and is led by Dr. Yifan Tang, Dr. Ken Ogata and Dr. Chengyu Mao.

The 4.5Ah prototype was first unveiled by Dr. Yifan Tang, Chief Technology Officer of SERES, at FISITA PLUS 2019, a mobility conference in London, U.K.

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.

—Dr. Ken Ogata, Senior Manager, Battery Technology of SERES

Operating from twin R&D centers in Santa Clara, California, and Tokyo, Japan, TeraWatt’s team has already filed more than 80 patents. The team has also opened itself to strategic partnerships and external investment to firms interested in accelerating mass production of next-generation battery technologies.



No mention here or on their site of the power density, which is the Achille's heel of solid state.


Yes, the ability to fast charge is important.

How about the truth?

432Wh/kg is a lot different than 432kWh/kg (in the title).


260 watt-hours per kilogram is current density. Fast charging and 432Wh/kg is game changing. Something like a Tesla can drive well over 400 miles tween high speed charges. Hope these are released next year.


Here is a paper on prelithiated carbon nanosphere anodes,
they got 400 Wh/kg and 10C charging.


Dream stuff and a long way from production; however, the density measurements are exciting and encouraging. If true, a 2011 Leaf, with a 73 mile range could travel 220 miles on the same size battery.


Well Samsung is supposed to release their graphene ball solid state batteries in phones next year. 400 Wh/kg . That doesn't sound like distant future


Solid state has been falling down on power out as well as power in.

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What is the TeraWatt Technology connection to Samsung?
Dr. Ken Ogata has numerous patents with Samsung, mostly related to Silicon anodes.
Read AutocarUK article "Chinese start-up Seres searching for UK battery partner" that Seres was using Samsung batteries.
Also suspect battery uses a Silicon anode, polymer electrolyte, and NMC cathode based on developers background.

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Final note. TeraWatt Technology is not listed as a client of TOYO System. However, Samsung is.


Simple math. In reality, silicon cannot reach 400Wh/kg or even 350Wh/kg with full use of it under conventional cell design due to the volume expansion. Other discrete techs must be used in TERA3.0.

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