Sodium-Tin Alloy (Na15Sn4) Sheets (40*80 mm, T=50 um) as Anode Electrode for Na-Ion Battery, 1 pcs/pack, CSIBAENaSnAS

Sodium-tin alloy (Na15Sn4) represent the theoretical terminal sodiation phase of the tin–sodium binary system. In sodium-ion battery R&D, pre-formed Na15Sn4 foils or chips are employed either as freestanding high-capacity negative electrodes or as quasi-reference/counter electrodes (substitutes for raw metallic sodium) to evaluate cathode active materials without the severe dendrite and interfacial instability associated with pure sodium metal.

In laboratory half-cells, testing cathodes against metallic sodium foils introduces severe experimental artifacts: mossy dendrites, high local overpotentials, and continuous electrolyte consumption. Na15Sn4 chips address several of these issues: (1) Stable Operating Potential: Operates along a flat two-phase equilibrium plateau (Na15Sn4 vs. Na9Sn4) between 0.08 V and 0.12 V vs. Na/Na+. This low potential preserves high full-cell operating voltages while preventing the localized zero overpotentials that trigger sodium dendrite nucleation. (2) Higher Melting Point & Mechanical Robustness: Pure sodium melts at 97.8 °C and creeps readily under low mechanical stack pressure. The intermetallic Na15Sn4 phase has a higher solidus temperature, allowing mechanical evaluation under higher stack pressures without separator shorting. (3) Safer Handling Baseline: Intermetallic sodium-tin alloys exhibit lower chemical activity toward trace air, moisture, and organic solvents than pure elemental sodium, reducing the risk of violent exotherms.

Part Number	CSIBAENaSnAS (C-SIB-AE-NaSnAS)
Chemical Formula	Na15Sn4
Alloy Sheet Sizes	Rectangular Sheet: 40 mm * 80 mm T=50 um (active Na15Sn4) (Al support with thickness of 30 um) Note: The thickness of 100 mm also can be supplied upon request.
Package Grade	1 pcs/pack
Sample Package	The sodium-tin alloy sheet with aluminum support are firstly sealed in plastic container and further vacuum sealed in an aluminum-laminated bag. Finally, it was placed in a black container for safety transport.
Attention	The whole package with sodium-tin alloy sheets should be opened and operated inside a glove box with Argon Gas and moisture less than 1%RH (0.1 ppm is better).

References: 

1. J. A. S. Oh, et al. A Robust Solid–Solid Interface Using Sodium–Tin Alloy Modified Metallic Sodium Anode Paving Way for All-Solid-State Battery, Adv. Energy Mater., 2021, 11, 2101228.
2. O. J. Dahunsi, et al. One-Step Synthesis of Na–Sn Alloy with Internal 3D Na15Sn4 Support for Fast and Stable Na Metal Batteries, ACS Appl. Energy Mater. (2022) 5 (1): 20–26.