TEA-BF4 Tetraethylammonium tetrafluoroborate CAS 429-06-1

Tetraethylammonium Tetrafluoroborate (TEABF₄)

Chemical Name Tetraethylammonium tetrafluoroborate

Chemical Synonyms TEABF₄; Tetraethylammonium fluoroborate; N,N,N-Triethylethanaminium tetrafluoroborate; Et₄NBF₄

CAS No. 429-06-1

Molecular Formula

C₈H₂₀BF₄N（or C₈H₂₀N·BF₄）

Molecular Weight 217.06 g/mol

Product Properties

White to off-white crystalline powder or solid. Quaternary ammonium salt with high thermal stability (melting point ≥300 °C) and excellent solubility in polar organic solvents such as acetonitrile and propylene carbonate. Delivers high ionic conductivity—approximately 56–60 mS/cm for 1.0 M in acetonitrile—and a wide electrochemical stability window, with an operating voltage of up to 2.5 V in supercapacitor systems. Electrochemical-grade purity with tightly controlled moisture, chloride, and free acid ensures reproducible performance in sensitive electrochemical applications.

Storage

Store in a cool, dry, well-ventilated area. Keep container tightly sealed and protect from moisture and direct sunlight. Hygroscopic; handle under dry conditions.

Packing

Standard: 5 g / 25 g / 100 g / bulk. Custom packaging available upon request.

Application

- Supercapacitor electrolyte: Preferred supporting electrolyte in non-aqueous organic electrolytes for electric double-layer capacitors (EDLCs) and flexible/ solid-state supercapacitor research.

- Lithium-ion battery electrolyte additive: Reduces graphite anode interface impedance and improves rate capability and cycle stability at low additive concentrations (e.g., 0.1 M).

- Non-aqueous electrochemistry: Supporting electrolyte for electrochemical polymerization, electrocatalytic reduction, and electrochemical impedance spectroscopy (EIS).

- Organic synthesis: Phase-transfer catalyst and ionic liquid catalyst in organic reactions.

Product Specification

| Parameter | Specification |

| Appearance | White to off-white crystalline powder / solid |

| Assay (Purity) | ≥99.0% |

| Melting Point | ≥300 °C |

| Water Content (Moisture) | ≤200 ppm (electrochemical grade); <0.1% (standard grade) |

| Chloride (Cl⁻) | ≤2 ppm |

| Free Acid (as HF) | ≤50 ppm |

| Solubility | Soluble in acetonitrile, propylene carbonate; clear, colorless solution |

Features at a glance: high electrochemical-grade purity · wide potential window · high ionic conductivity · controlled trace impurities · high thermal stability (mp ≥300 °C)