Tin-Based Anode Materials for Sodium-Ion Batteries

Tin has emerged as a front-running anode material for sodium-ion batteries owing to its high theoretical capacity, low working potential and relative abundance. Unlike lithium-ion systems, sodium-ion batteries demand hosts that can accommodate the larger ionic radius of Na+, and tin’s ability to form multiple sodiation alloys offers capacities approaching 870 mAh g⁻¹. Yet the large volumetric changes during alloying and dealloying—often exceeding 200 %—pose severe challenges in mechanical integrity, cyclability and interfacial stability. Current strategies to address these issues include engineering nanoscale architectures (yolk–shell structures, quantum dots, nanowires), incorporating conductive carbon matrices, introducing flexible or self-healing coatings and designing robust solid-electrolyte interphases. Alloying tin with other metals, fabricating binder-free arrays and tailoring electrolyte additives have also proved effective in mitigating pulverisation and enhancing ionic transport. Collectively, these advances point towards practical sodium-ion cells with improved rate capability, extended cycle life and scalable fabrication routes, reinforcing tin’s potential to complement or even supplant hard-carbon anodes in large-scale energy storage.

Research from Nature Portfolio

Recent studies have harnessed advanced characterisation to unravel tin’s structural evolution under sodiation. In situ hard X-ray nanotomography has revealed that tin particles exhibit a remarkable three-dimensional reversibility during repeated cycling, challenging prior assumptions that sodium insertion invariably induces catastrophic fracture. This work demonstrates that certain tin morphologies can withstand multi-cycle volumetric strain through reversible pore formation and closure, offering a pathway to more durable anodes. Complementing this, a binder-free electrode architecture based on electrochemically grown tin nanoarrays on copper foil has been developed. By thermally alloying tin and copper at their interface, a conductive and electrochemically inert “glue” layer forms, robustly anchoring active material to the current collector. The result is a markedly improved cycling stability under high currents, underscoring the importance of interfacial engineering for high-energy sodium-ion systems.

Tin-Based Anode Materials for Sodium-Ion Batteries publication trend

The graph below shows the total number of articles in tin-based anode materials for sodium-ion batteries across all publications each year (not limited to Nature Index journals).

Technical terms

Sodiation/desodiation: The reversible insertion and extraction of Na⁺ ions into and from an electrode material during battery charging and discharging.

Solid-electrolyte interphase (SEI): A passivation layer that forms on the electrode surface through electrolyte decomposition, critical for controlling ion transport and long-term stability.

Alloying reaction: A process in which sodium ions chemically combine with tin to form intermetallic compounds, enabling high capacity but accompanied by volumetric expansion.

References

1. Probing three-dimensional sodiation–desodiation equilibrium in sodium-ion batteries by in situ hard X-ray nanotomography. Nature Communications (2015).
2. Rooting binder-free tin nanoarrays into copper substrate via tin-copper alloying for robust energy storage. Nature Communications (2020).
3. Construction of robust solid-electrolyte interphase via electrode additive for high-performance Sn-based anodes of sodium-ion batteries. Energy Storage Materials (2024).
4. Self‐Adaptive Graphdiyne/Sn Interface for High‐Performance Sodium Storage. Advanced Science (2024).