The US-based start-up EOS Energy have launched their latest generation version of its Z3 battery for critical 3-to-12-hour discharge duration uses, made up of a zinc hybrid cathode.
The company, which is in New Jersey, claim it is the intraday market’s only US-designed and manufactured alternative to monopolar lithium-ion and lead-acid batteries for this purpose.
It said the new Z3 batteries are more durable and have a 20-year lifespan.
The battery is based on proprietary components with 95 patents published for the Z3 according to the specifications sheet.
It has a non-degradable bipolar electrode, made of a conductive plastic anode and a cathode of carbon-felt.
The company said the bipolar structure allows for the internal battery connections to be simplified, which it said: “reduces internal resistance and improves round-trip efficiency.”
The batteries’ electrolytes are a blend of water, halides, additives and buffering agents.
Eos claim that this improves “zinc solubility and plating and eliminates the dendrite and densification issues that can lead to performance decay and safety hazards.”
The z3 battery module is rated at 0.15kW/0.8kWh for DC outputs and has a voltage range from 22 to 48 VDC, it said.
EOS said that it was inspired by zinc plating baths for its design of the Z3 battery modules.
This comes after the US Department of Energy gave a loan guarantee to Eos of $303.5 million in December 2024 to cover construction costs for up to four production lines for the Z3 in Pennsylvania.
The DOE said it was expected 8GWh of storage capacity would be manufactured annually by 2027.
