Overview
Sodium electrolyte is a conductive solution essential for sodium-ion battery operation, consisting of sodium salts dissolved in organic solvents. Unlike lithium counterparts, it offers cost advantages due to sodium's abundance, though with slightly lower energy density. Common formulations use salts like sodium hexafluorophosphate (NaPF₆) in carbonate solvent mixtures (e.g., EC:DMC). The electrolyte enables Na⁺ ion shuttling between electrodes during charge/discharge cycles, with ongoing research optimizing stability and performance.
Physical and Chemical Properties
Sodium electrolytes typically exhibit ionic conductivities of 5-15 mS/cm at room temperature, influenced by salt concentration and solvent choice. Viscosity ranges from 2-5 cP, balancing ion mobility and wettability. Key stability metrics include electrochemical windows of 2.5-4.5V vs. Na/Na⁺, with decomposition risks at high voltages or temperatures. Hygroscopicity requires strict moisture control (<20 ppm), as water reacts with salts to form HF or other corrosive byproducts.
Main Applications
Primary use is in sodium-ion batteries for grid storage and EVs, where cost and safety outweigh energy density needs. Emerging markets include stationary storage systems leveraging sodium’s thermal stability. Niche applications include sodium-based supercapacitors and electroplating processes. Research explores solid-state sodium electrolytes to eliminate flammability risks, though liquid variants dominate commercial use due to manufacturability.
Safety and Storage
Organic carbonate solvents pose fire hazards; storage requires flameproof cabinets and inert gas blankets. Decomposition products (e.g., from NaPF₆ hydrolysis) may include toxic HF gas, necessitating fume hood handling. Suppliers often pre-mix electrolytes with stabilizers (e.g., FEC additive) to prolong shelf life. Transportation follows UN1993 (flammable liquid) regulations, with tamper-evident seals to prevent moisture ingress.
B2B Procurement Guide
Industrial buyers should prioritize batch consistency, with certificates analyzing impurity levels (e.g., <50 ppm metals). Custom formulations may specify additives like vinylene carbonate for SEI improvement. Bulk purchases (drum/tanker) reduce costs but require on-site storage infrastructure. Verify supplier compliance with ISO 9001 and battery-grade material specifications, especially for EV applications.
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