U.S. startup unveils zinc-polyiodid redox flow battery with energy density of 320 Wh/L
Summary
BEESt announced that its new redox flow battery technology delivers 20 times the energy density of conventional vanadium flow storage systems. The battery is based on a zinc–polyiodide redox flow chemistry developed by the Pacific Northwest National Laboratory.
<p class="p1"><span class="s1">BEESt announced that its new redox flow battery technology delivers 20 times the energy density of conventional vanadium flow storage systems. The battery is based on a zinc–polyiodide redox flow chemistry developed by the Pacific Northwest National Laboratory.</span></p><p><strong>From <a href="https://www.ess-news.com/2025/09/29/us-startup-unveils-zinc-polyiodid-redox-flow-battery-with-energy-density-of-320-wh-l/" rel="noopener" target="_blank">ESS News</a></strong></p>
<p>US-based startup BEESt has launched a new redox flow battery technology that reportedly achieves 20 times higher energy density than conventional vanadium redox flow energy storage systems.</p>
<p>“Our battery is well-suited for solar and other renewable projects because it provides extended-duration storage without degradation, enabling round-the-clock reliability,” the company's CEO, Joley Michaelson, told <strong>pv magazine</strong>. “That makes it effective for both hybrid renewable systems and standalone stationary storage. Its compact footprint also makes it easier to deploy alongside solar where space is limited.”</p>
<p>“Our initial focus will be the commercial and industrial market, especially government, critical infrastructure, and industrial users who require absolute energy reliability and safety. We will follow with a residential launch in early 2028,” he added.</p>
<p>The system’s key innovations include an electrolyte made with zinc–polyiodide (ZnI₂), developed by the U.S. Department of Energy’s Pacific Northwest National Laboratory (PNNL), and a “patent-pending” cell stack based on unspecified “earth-abundant” alloy materials sourced in the United States.</p>
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