Na metal batteries are promising next generation batteries, but their applications are constrained by the high reactivity of metallic Na. Here we address this challenge by using one-step synthesized Na-Sn alloy anode with 1.6 at. % Sn. The Sn atoms are sodiophilic and have stronger bindings with Na atoms, which guide uniform Na deposition and ensure dendrite-free Na interface during battery cycling. This anode has interconnected and sodiophilic Na15Sn4 backbones, which structurally support Na, enable faster Na+/Na redox kinetics and guide dendrite free Na plating with more stable solid-electrolyte interfaces. The composite Na@Na15Sn4 anode enabled very stable cycling of symmetric cells even at 5.0 mA cm-2, and improved stability of full cells coupled with 3.0 mAh cm-2 Na3V2(PO4)3 cathodes to &gt;90% capacity retention for 300 cycles. The alloying approach is facile, scalable and opens new opportunities for designing practical high energy density Na metal batteries

One-step synthesis of na-sn alloy with internal 3-D Na15Sn4 support for fast and stable Na metal batteries

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ACS Fall 2022

The official archive and repository for all ACS Meetings & Expositions abstracts and select posters or presentations.