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Meeting the Challenge of Future Commercial Energy Storage with TETRA PureFlow Ultra-Pure Zinc Bromide
By Archie Vest | Senior Director of Bromines, TETRA Chemicals North America | May 4th, 2023

The Zinc-Bromide Alternative for Power Storage Batteries
For grid-scale applications, an excellent alternative to lithium-ion batteries for power storage is zinc-bromine flow batteries. Invented in the 1970s, zinc-bromine flow batteries use low-cost, readily available materials, have longer lives, pose little risk of fire as the electrolytes are non-flammable, and provide duration cycles longer than their lithium-ion counterpart.

In fact, with the current proliferation of wind and solar power storage installations, the market for zinc-bromine batteries is growing fast, with several companies now developing and deploying commercial zinc-bromine batteries and building up lengthy backlogs for demand.

To support the fast-growing need for commercial energy storage, TETRA Technologies pioneered its TETRA PureFlow® ultra-pure zinc bromide for use in grid-scale storage systems and solar power battery storage. TETRA believes it is the only producer of commercial quantities of zinc bromide in the United States and manufactures PureFlow zinc bromide using a proprietary process at its chemical plant in West Memphis, Arkansas.

With regard to the security of resource supply, TETRA holds the mineral rights to extensive brine leases in Arkansas that are estimated to contain 5.25 million tons of bromine. The Company is currently completing a detailed geological, reservoir, and production simulation study to determine and ensure a long-term supply of bromide.

The high-purity characteristics of PureFlow zinc bromide make it ideal for large-scale, long-lasting, high-performing battery technologies. To date, PureFlow zinc bromide has been tested and qualified by three separate manufactures of zinc-bromine storage batteries. In 2021, TETRA entered an agreement with Eos Energy Enterprises for collaboration and long-term supply of zinc bromide to support production of Eos’ innovative Znyth aqueous zinc battery. Based in Edison, New Jersey, Eos is a leading provider of safe, scalable, efficient, and sustainable zinc-based long-duration energy storage systems.

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