Nature Energy, Published online: 16 February 2026; doi:10.1038/s41560-026-01974-2

Alloy anodes can boost the energy density of Na-ion batteries but suffer from instability, and current strategies trade off performance and scalability. Here the authors develop a high-loading Sn anode reinforced with single-walled carbon nanotube networks, achieving high capacity and long-term cycling performance.