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CEC awards Eos Energy Storage $2.1M to demo AC-integrated zinc hybrid-cathode battery technology for grid storage

The California Energy Commission (CEC) has awarded $2.1 million to Eos Energy Storage, LLC to demonstrate an AC-integrated system incorporating the company’s zinc hybrid-cathode battery technology (“Zynth”) to enhance renewable energy generation and provide grid-scale, multi-hour energy storage.

Znyth battery technology uses a safe aqueous electrolyte and a novel zinc-hybrid cathode to enable extremely low-cost electricity storage and long life. After 10 years of development, Eos’ Znyth technology is built on 21 patents and patent applications with more than 600 claims covering cell configuration and architecture; cathode design and materials; electrolyte and electrolyte additives; battery management systems; and low-cost manufacturing processes.

Some of Znyth’s key advances include:

  • Titanium current collector with proprietary ceramic coating is permanently conductive, non-corrosive, and self-healing.

  • Aqueous, near neutral pH electrolyte is non-dendritic and does not absorb CO2, eliminating carbonate clogging issues.

  • Proprietary electrolyte additives and buffering agents enhance zinc solubility and plating to improve energy density and run-time.

  • Hybridization of cathode chemistries and electro-active catalysts improves power density and roundtrip efficiency.

  • Highly standardized manufacturing processes such as metal stamping and injection molding to keep manufacturing costs low.

In January, Eos announced the commercial availability of its MW-scale Aurora system for deliveries starting in 2016. Eos’s standard Aurora 1000|4000 product, a containerized 1 MW DC battery system providing four continuous hours of discharge, offers a cost-effective energy storage solution competitive with gas peaking generation and utility distribution infrastructure. The Aurora 1000|4000 is to be sold at a price of $160/kWh in volume.

At the time, Eos said that it was working with major power controls and integration partners to sell, install, and maintain AC-integrated battery systems through its Aegis Program, which includes Toshiba, Gamesa Electric, and others.


Gunder Karlsson

Is there anyone who knows if this is working or not - There is very little open information on this rather odd chemistry. Looking into one of their Patent applications,US 2013/0209919/A1, it appears like the discharge voltage is 0,9 V and the charge voltage is 2,1 V which really makes round trip efficiency very low. To me it appears a no winner. Secondly Ti-metal is very expensive especially considering its poor conductivity. Is this concept for real or have they made quantum leaps in performance recently?

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