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High-energy-density battery systems have been critical to applications in consumer electronics, aviation, electric vehicles, and emerging large-scale stationary storage. Here, we report a solid-electrolyte-based liquid Li-S and Li-Se (SELL-S and SELL-Se in short) battery system with the potential to deliver energy density exceeding 500 Wh kg À1 and 1,000 Wh L À1 , together with the ability of low cost and stable electrochemical performance for future concentrated and largescale storage applications.

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Atomically dispersed Pt is prepared by photochemical synthesis at a record-low temperature of −60 °C, which exhibits ultrahigh catalytic activity.