Fully dry-processed electrodes for highly reversible aqueous zinc powder-based batteries

作者：Han Wu, Yunling Jiang, Shao-Jian Zhang, Yiyang Hu, Junnan Hao, Shi‐Zhang Qiao · 发表于：Science Advances · 年份：2026 · DOI：10.1126/sciadv.aeh1116 · 研究领域：Advanced battery technologies research、Electrocatalysts for Energy Conversion、Advanced oxidation water treatment

Aqueous zinc-ion batteries have advanced rapidly, but practical deployment is limited by excessive negative-to-positive (N/P) ratios (>50), decreasing the energy density. Zinc powder anodes can lower N/P, yet their high specific surface area accelerates parasitic reactions and shortens lifespan. Here we report a high-loading and highly reversible dry-processed zinc powder anode with a non-electrochemically driven solid-electrolyte interphase (SEI). The dry process retains a homogeneous distribution of a sodium phosphate SEI precursor throughout the anodes, triggering spontaneous formation of a zinc phosphate-based SEI upon electrolyte contact that suppresses hydrogen evolution and zinc corrosion. Coupling this anode with dry-processed cathodes (90 mg cm −2 ; 12.5 mAh cm −2 ) yields the fully dry-processed aqueous zinc battery. A pouch cell delivers 88.8% capacity retention after 530 cycles at N/P ∼ 3, outperforming prior zinc powder systems despite ∼20-fold higher cathode loadings and providing a scalable path to high-energy-density aqueous zinc batteries for practical grid-scale storage.