Welcome to the Aqueous Battery Brief. In this week’s roundup: SoftBank Corp. enters zinc energy storage, more on that 6K charge-discharge cycle all-iron flow, and much more.
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May 21, 2026 • Estimated reading time: 2 – 3 minutes.
Adoption, Deals, and Tech
SoftBank Enters Zinc Energy Storage
Japanese telecom giant SoftBank Corp. is launching a new line of zinc-halogen batteries – a move the firm expects to yield over ¥100 billion ($637 million) in annual revenue by fiscal 2030.
Partnering with South Korean startups Cosmos Lab and DeltaX for production, SoftBank is looking to deploy the technology first at its own AI data centers, and then to enter further AI, grid-scale, industrial and residential markets in Japan and abroad.
The company says it specifically chose zinc-halogen to avoid lithium’s ignition risks and to sidestep supply-chain dependency on Chinese lithium and cobalt.
Read coverage in outlets including The Wall Street Journal, Bloomberg, Nikkei Asia, Energy Storage News, and ESS News.
More on China’s 6K Charge-Discharge Cycle Breakthrough
Recently, researchers in China announced an all-iron flow battery with an incredible 6,000 charge-discharge cycles under lab conditions. Get an explanation of the battery, and a high-level view on where iron-flow fits in the supply chain, scalability, and the Chinese battery landscape. It’s in Discovery Alert.
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Aqueous Deep Dives
The State of Zinc Batteries
Josef Daniel-Ivad, Head of The International Zinc Association’s Zinc Battery Initiative, lays out the opportunities, challenges, and achievements of the zinc energy storage industry since the Initiative was founded in 2020.
- Among the highlights: Five battery developers have commercialized, several more are moving from pilot lines into full production, and the industry has seen $1.3 billion in combined private and public investment.
- Among the challenges: regulatory standards built for lithium’s shortcomings – not zinc’s strengths.
Read Ivad’s full accounting of the highs and hurdles in Energy Storage News.
Why It’s Time for India’s Zinc Storage Moment
India – one of the world’s top four zinc producers – is looking to build its domestic industries, wean itself from Chinese imports, and hit a target of 500 GW of non-fossil fuel capacity by 2030. All strong reasons to build its domestic zinc energy storage industry, argues Offgrid Energy Labs Co-Founder Rishi Srivastava. Read his case in The Economic Times’ manufacturing section.
Octet Case Study: 2x Cycle Life Unlocked
For one zinc systems developer, Octet screened 70+ additive combinations, addressed dendrite and corrosion failures, and found a path to double cycle life and lower BOM by up to 30%. Learn how in our latest case study.
Mark Your Calendars
📆 Get ahead of your planning with the Aqueous Energy Events Calendar in our December 29th Aqueous Battery Brief.
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